| 1. |
Akio Yamauchi, Kentaro Tanaka, Masaaki Fuki, Saiya Fujiwara, Nobuo Kimizuka, Tomohiro Ryu, Masaki Saigo, Ken Onda, Yasuhiro Kobori,* Kiyoshi Miyata,* Nobuhiro Yanai*, Room-temperature quantum coherence of entangled multiexcitons in a metal-organic framework, Science Adv., 2024, 10, eadi3147, 10.1126/sciadv.adi3147, 10, 2023.11. |
| 2. |
Kana Orihashi, Akio Yamauchi, Miku Inoue, Bhavesh Parmar, Saiya Fujiwara, Nobuo Kimizuka, Mizue Asada, Toshikazu Nakamura, Nobuhiro Yanai*, Radical qubits photo-generated in acene-based metal–organic frameworks, Dalton Trans., 10.1039/D3DT03959E., 53, 872-876, 2023.12. |
| 3. |
Kana Orihashi, Akio Yamauchi, Saiya Fujiwara, Mizue Asada, Toshikazu Nakamura, Joseph Ka-Ho Hui, Nobuo Kimizuka, Kenichiro Tateishi, Tomohiro Uesaka, Nobuhiro Yanai*, Spin-Polarized Radicals with Extremely Long Spin-Lattice Relaxation Time at Room Temperature in a Metal-Organic Framework, J. Am. Chem. Soc., 10.1021/jacs.3c09563, 145, 27650-27656, 2023.10. |
| 4. |
Teppei Yamada *, Takashi Kobayashi, Yusuke Wakayama, Fumitoshi Matoba, Koichi Yatsuzuka, Nobuo Kimizuka, Hongyao Zhou , An aqueous vanadium complex for the superior electrolyte of a thermo-electrochemical cell, Sustainable Energy Fuels, 10.1039/d3se00774j, 8, 684, 2023.10. |
| 5. |
Hisayasu Ishibashi, Manuel Rondelli, Hiroki Shudo, Takehisa Maekawa, Hideto Ito, Kiichi Mizukami, Nobuo Kimizuka, Akiko Yagi, Kenichiro Itami, Noncovalent Modification of Cycloparaphenylene by Catenane Formation Using an Active Metal Template Strategy, Angew. Chem., Int. Ed, 10.1002/anie.202310613, 62, 2023.08. |
| 6. |
M-a. Morikawa, Y. Yamanaka, J. K- H Hui, N. Kimizuka, Photoliquefaction and phase transition of m-bisazobenzenes give molecular solar thermal fuels with a high energy density, RSC Adv., 10.1039/d3ra04595a, 13, 24031-24037, 2023.07, A series of m-bisazobenzene chromophores modified with various alkoxy substituents (1; methoxy, 2;
ethoxy, 3; butoxy, 4; neopentyloxy) were developed for solvent-free molecular solar thermal fuels (STFs).
Compounds (E,E)-1–3 in the crystalline thin film state exhibited photoliquefaction, the first example of
photo-liquefiable m-bisazobenzenes. Meanwhile, (E,E)-4 did not show photoliquefaction due to the
pronounced rigidity of the interdigitated molecular packing indicated by X-ray crystallography. The m
bisazobenzenes 1–4 exhibited twice the Z-to-E isomerization enthalpy compared to monoazobenzene
derivatives, and the latent heat associated with the liquid–solid phase change further enhanced their
heat storage capacity. To observe both exothermic Z-to-E isomerization and crystallization in a single
heat-up process, the temperature increase of differential scanning calorimetry (DSC) must occur at
a rate that does not deviate from thermodynamic equilibrium. Bisazobenzene 1 showed an
unprecedented gravimetric heat storage capacity of 392 J g−1 that exceeds previous records for well
defined molecular STFs.. |
| 7. |
M-a. Morikawa, M. Mizuno, N. Harada, N. Kimizuka, On-Demand Triplet-Sensitized Photoswitching of Arylazopyrazoles, Chem. Lett., 2023, 52,, 10.1246/cl.230281, 52, 727-731, 2023.08. |
| 8. |
K. Nishimura, R. Yabuki, T. Hamachi, N. Kimizuka, K. Tateishi, T. Uesaka, N. Yanai., Dynamic Electron Polarization Lasting More Than 10 μs by Hybridizing Porphyrin and TEMPO with Flexible Linkers, J. Phys. Chem. B. , 127, 1219-1228, 2023.02. |
| 9. |
Naoyuki Harada, Masanori Uji, Baljeet Singh, Nobuo Kimizuka, Nobuhiro Yanai, Porous film impregnation method for record-efficiency visible-to-UV photon upconversion and subsolar light harvesting, JOURNAL OF MATERIALS CHEMISTRY C, 10.1039/d3tc00236e, 2023.03. |
| 10. |
Yusuke Kawashima, Tomoyuki Hamachi, Akio Yamauchi, Koki Nishimura,Yuma Nakashima, Saiya Fujiwara, Nobuo Kimizuka, Tomohiro Ryu, Tetsu Tamura,
Masaki Saigo, Ken Onda, Shunsuke Sato, Yasuhiro Kobori, Kenichiro Tateishi, Tomohiro Uesaka, Go Watanabe,* Kiyoshi Miyata,* Nobuhiro Yanai, Singlet fission as a polarized spin generator for biological nuclear hyperpolarization, chemRxiv, 10.26434/chemrxiv-2022-r4636, 2022.04. |
| 11. |
Yoichi Sasaki, Nobuhiro Yanai*, and Nobuo Kimizuka*, Osmium Complex-Chromophore Conjugates with Both Singlet-to-Triplet Absorption and Long Triplet Lifetime through Tuning of the Heavy-Atom Effect br, INORGANIC CHEMISTRY, 10.1021/acs.inorgchem.1c03129, 61, 16, 5982-5990, 2022.04. |
| 12. |
Masa-aki Morikawa, Yuta Yamanaka, Nobuo Kimizuka, Liquid Bisazobenzenes as Molecular Solar Thermal Fuel with Enhanced Energy Density, CHEMISTRY LETTERS, 10.1246/cl.210822, 51, 4, 402-406, 2022.04. |
| 13. |
David G. Bossanyi, Yoichi Sasaki, Shuanqing Wang, Dimitri Chekulaev,
Nobuo Kimizuka, Nobuhiro Yanai * Jenny Clark *, In optimized rubrene-based nanoparticle blends for photon upconversion, singlet energy collection outcompetes triplet-pair separation, not singlet fission, JOURNAL OF MATERIALS CHEMISTRY C, 10.1039/d1tc02955j, 10, 12, 4684-4696, 2022.03. |
| 14. |
Masanori Uji, Naoyuki Harada, Nobuo Kimizuka, Masaki Saigo, Kiyoshi Miyata, Ken Onda, Nobuhiro Yanai
, Heavy metal-free visible-to-UV photon upconversion with over 20% efficiency sensitized by a ketocoumarin derivative, JOURNAL OF MATERIALS CHEMISTRY C, 10.1039/d1tc05526g, 10, 12, 2022.03. |
| 15. |
Saiya Fujiwara, Naoto Matsumoto, Koki Nishimura, Nobuo Kimizuka, Kenichiro Tateishi , Tomohiro Uesaka,Nobuhiro Yanai, Triplet Dynamic Nuclear Polarization of Guest Molecules through Induced Fit in a Flexible Metal-Organic Framework, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 10.1002/anie.202115792, 61, 9, 2022.02. |
| 16. |
Tsubasa Kashino, Rena Haruki, Masanori Uji, Naoyuki Harada, Masanori Hosoyamada, Nobuhiro Yanai, and Nobuo Kimizuka, Design Guidelines for Rigid Epoxy Resins with High Photon Upconversion Efficiency: Critical Role of Emitter Concentration, ACS APPLIED MATERIALS & INTERFACES, 10.1021/acsami.1c17021, 14, 20, 22771-22780, 2022.01. |
| 17. |
Haklae Lee, Myung-Soo Lee, Masanori Uji, Naoyuki Harada, Jeong-Min Park, Jiyeon Lee, Sung Eun Seo, Chul Soon Park, Jinyeong Kim, Seon Joo Park, Suk Ho Bhang, Nobuhiro Yanai, Nobuo Kimizuka, Oh Seok Kwon, and Jae-Hyuk Kim, Nanoencapsulated Phase-Change Materials: Versatile and Air-Tolerant Platforms for Triplet-Triplet Annihilation Upconversion, ACS APPLIED MATERIALS & INTERFACES, 10.1021/acsami.1c21080, 14, 3, 4132-4143, 2022.01. |
| 18. |
Yuki Nagai, Masa-aki Morikawa, Nobuo Kimizuka, Near-Infrared Vapochromism in Lipid-Packaged Mixed-Valence Coordination Polymers, Chem. Commun, 10.1039/D1CC06723K, 58, 2112-2115, 2022.01, Reversible vapochromism in the NIR region is achieved for a mixed-valence platinum complex with lipid counterions, from which exclusion of crystallization water by organic vapor alters the lipid molecular orientation, which amplifies the information to changes in the 1D coordination structure and the electronic state.. |
| 19. |
Mio. Koharagi, Naoyuki. Harada, Keisuke. Okumura, Junji. Miyano, Shota. Hisamitsu, Nobuo. Kimizuka, Nobuhiro. Yanai, Green-to-UV photon upconversion enabled by new perovskite nanocrystal-transmitter-emitter combination, NANOSCALE, 10.1039/d1nr06588b, 13, 47, 19890-19893, 2021.12. |
| 20. |
Zhihang Wang , Henry Moïse , Martina Cacciarini , Mogens Brøndsted Nielsen , Masa-aki Morikawa, Nobuo Kimizuka, Kasper Moth-Poulsen
, Liquid-Based Multijunction Molecular Solar Thermal Energy Collection Device, ADVANCED SCIENCE, 10.1002/advs.202103060, 8, 21, 2021.11. |
| 21. |
David G. Bossanyi, Yoichi Sasaki, Shuanqing Wang, Dimitri Chekulaev,
Nobuo Kimizuka, p Nobuhiro Yanai * Jenny Clark *, Spin Statistics for Triplet–Triplet Annihilation Upconversion: Exchange Coupling, Intermolecular Orientation, and Reverse Intersystem Crossing, ACS Au, 10.1021/jacsau.1c00322, 2188-2201, 2021.10. |
| 22. |
Pankaj Bharmoria, Shota Hisamitsu, Yoichi Sasaki, Tejwant Singh Kang, Masa-aki Morikwawa, Biplab Joarder, Kasper Moth-Poulsen, Hakan Bildirir, Anders Martensson, Nobuhiro Yanai, Nobuo Kimizuka, Photon upconverting bioplastics with high efficiency and in-air durability, JOURNAL OF THE AMERICAN MEDICAL DIRECTORS ASSOCIATION, 10.1039/d1tc00287b, 9, 35, 11655-11661, 2021.09. |
| 23. |
Yimin Liang, Joseph Ka-Ho Hui, Masa-aki Morikawa, Hirotaka Inoue, Teppei Yamada, Nobuo Kimizuka., High Positive Seebeck Coefficient of Aqueous I–/I3– Thermocells Based on Host-Guest Interactions and LCST Behavior of PEGylated -Cyclodextrin, ACS Appl. Energy Mater., 10.1038/s41598-021-91419-5, 4, 5, 5326-5331, 2021.06. |
| 24. |
＃Naura Fakhira Antariksa, Teppei Yamada, Nobuo Kimizuka, High seebeck coefficient in middle-temperature thermocell with deep eutectic solvent, SCIENTIFIC REPORTS, 10.1038/s41598-021-91419-5, 11, 1, 11929, 2021.06. |
| 25. |
Yoichi Sasaki, Shogo Amemori, Nobuhiro Yanai, Nobuo Kimizuka, Singlet-to-Triplet Absorption for Near-Infrared-to-Visible Photon Upconversion, BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 10.1246/bcsj.20210114, 94, 6, 1760-1768, 2021.06. |
| 26. |
Akio Yamauchi, Saiya Fujiwara, Koki Nishimura, Yoichi Sasaki, Kenichiro Tateishi, Tomohiro Uesaka, Nobuo Kimizuka, Nobuhiro Yanai, Design Guidelines to Elongate Spin-Lattice Relaxation Time of Porphyrins with Large Triplet Electron Polarization, J. Phys. Chem. A., 125, 10.1021/acs.jpca.1c01839, 125, 4267-4498, 2021.05. |
| 27. |
Tsubasa Kashino, Masanori Hosoyamada, Rena Haruki, Naoyuki Harada, Nobuhiro Yanai*Nobuhiro Yanai, Nobuo Kimizuka*, Bulk Transparent Photon Upconverting Films by Dispersing High-Concentration Ionic Emitters in Epoxy Resins, ACS Appl. Mater. Interfaces, 13, 11, 13676-13683, 2021.03. |
| 28. |
Tomoyuki Hamachi, Koki Nishimura, Hironori Kouno, Yusuke Kawashima, Kenichiro Tateishi, Tomohiro Uesaka, Nobuo Kimizuka, Nobuhiro Yanai, Porphyrins as Versatile, Aggregation-Tolerant, and Biocompatible Polarizing Agents for Triplet Dynamic Nuclear Polarization of Biomolecules, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 10.1021/acs.jpclett.1c00294, 12, 10, 2645-2650, 2021.03. |
| 29. |
Hiroaki Iguchi, Hidenori Furutani, Nobuo Kimizuka, Ionic Charge-Transfer Liquid Crystals Formed by Alternating Supramolecular Copolymerization of Liquid π-Donors and TCNQ, Frontiers in Chemistry. , 10.3389/fchem.2021.657246, 9, 657246, 2021.03. |
| 30. |
Yuki Nagai, Keita Ishiba, Ryosuke Yamamoto, Teppei Yamada, Masa-aki Morikawa, Nobuo Kimizuka, Light‐Triggered, Non‐Centrosymmetric Self‐Assembly of Aqueous Arylazopyrazoles at the Air–Water Interface and Switching of Second‐Harmonic Generation, Angew. Chem. Int. Ed. , 10.1002/anie.202013650, 60, 12, 6333-6338, 2021.03, Trans-p-methoxy arylazopyrazole spontaneously forms non-centrosymmetric polar crystals, which reversibly undergo liquefaction upon photoisomerization to the cis-isomer. This liquid cis-isomer has a large electric dipole moment and is highly soluble in water (solubility up to ≈58 mM), which is remarkably higher than that of the trans-isomer (690 μM). Vis-light illumination of the aqueous cis-isomer generates macroscopically oriented, non-centrosymmetric crystals at the air–water interface. Polar crystals are also formed in sandwich glass cells (spacing, 20 μm) upon photo-induced crystallization of the liquid cis-isomer. The trans-crystals thus formed showed second harmonic generation (SHG) whose intensity is switched on/off in response to the photo-induced phase transition.. |
| 31. |
Hongyao Zhou ,Teppei Yamada ,Nobuo Kimizuka, Supramolecular Thermocells Based on Thermo-Responsiveness of Host–Guest Chemistry, Bull. Chem. Soc. Jpn., 10.1246/bcsj.20210061, 1525-1546, 2021.03. |
| 32. |
Pankaj Bharmoria, Shota Hisamitsu, Yoichi Sasaki, Tejwant Singh Kang, Masa-aki Morikwawa, Biplab Joarder, Kasper Moth-Poulsen, Hakan Bildirir, Anders Martensson, Nobuhiro Yanai, Nobuo Kimizuka, Photon upconverting bioplastics with high efficiency and in-air durability, J. Mater. Chem. C, 10.1039/D1TC00287B, 2021.02. |
| 33. |
Mika Kinoshita, Yoichi Sasaki, Shogo Amemori, Naoyuki Amemori, Naoyuki Harada, Zhanhao Hu, Zonghao Liu, Luis K.Ono, Yabing Qi, Nobuhiro Yanai, Nobuo Kimizuka, Photon Upconverting Solid Films with Improved Efficiency for Endowing Perovskite Solar Cells with Near-Infrared Sensitivity, CHEMPHOTOCHEM, 10.1002/cptc.202000143, 4, 11, 5271-5278, 2020.11. |
| 34. |
Hisonori Nagatomi, Leighabbe. C. Gallington, Subhadip. Goswami, Jiaxin. Duan, Karena. W. Chapman, Nobuhiro. Yanai, Nobuo. Kimizuka, Omar. K. Farha, Joseph. T. Hupp, Regioselective Functionalization of the Mesoporous Metal-Organic Framework, NU-1000, with Photo-Active Tris-(2,2 '-bipyridine)ruthenium(II), ACS OMEGA, 10.1021/acsomega.0c04823, 5, 46, 30299-30305, 2020.11. |
| 35. |
Takashi Kobayashi, Teppei Yamada, Makoto Tadokoro, Nobuo Kimizuka, A Novel Thermocell System Using Proton Solvation Entropy, Chemistry - A European Journal,, 10.1002/chem.202005275, 27, 13, 4287-4290, 2020.11. |
| 36. |
Naoyuki Harada, Yoichi Sasaki, Masanori Hosoyamada, Nobuo Kimizuka* and Nobuhiro Yanai *, Discovery of Key TIPS‐Naphthalene for Efficient Visible‐to‐UV Photon Upconversion under Sunlight and Room Light, Angew. Chem. Int. Ed., 10.1002/anie.202012419, 60, 1, 142-147, 2020.10. |
| 37. |
Benshuai Guo, Yu Hoshino, Fan Gao, Keisuke HayashiYoshiko Miura, Nobuo Kimizuka, Teppei Yamada, Thermocells driven by phase transition of hydrogel nanoparticles, J.Am.Chem.Soc, doi.org/10.1021/jacs.0c08600, 142, 41, 17318-17322, 2020.09. |
| 38. |
Masashi Kunitake, Ryota Tanoue, Rintaro Higuchi, Soichiro Yoshimoto, Ryusei Haraguchi, Shinobu Uemura, Nobuo Kimizuka, Adam Z. Stieg, James K. Gimzewski, Monomolecular covalent honeycomb nanosheets produced by surface-mediated polycondensation between 1,3,5-triamino benzene and benzene-1,3,5-tricarbox aldehyde on Au(111), Nanoscale Advances, 10.1039/d0na00180e, 2, 8, 3202-3208, 2020.08, Fabrication of a two-dimensional covalent network of honeycomb nanosheets comprising small 1,3,5-triamino benzene and benzene-1,3,5-tricarboxaldehyde aromatic building blocks was conducted on Au(111) in a pH-controlled aqueous solution. In situ scanning tunneling microscopy revealed a large defect-free and homogeneous honeycomb π-conjugated nanosheet at the Au(111)/liquid interface. An electrochemical potential dependence indicated that the nanosheets were the result of thermodynamic self-assembly based not only on the reaction equilibrium but also on the adsorption (partition) equilibrium, which was controlled by the building block surface coverage as a function of electrode potential. This journal is. |
| 39. |
Koki Nishimura, Hironori Kouno, Yusuke Kawashima, Kana Orihashi, Saiya Fujiwara, Kenichiro Tateishi, Tomohiro Uesaka, Nobuo Kimizuka, Nobuhiro Yanai, Materials chemistry of triplet dynamic nuclear polarization, Chemical Communications, 10.1039/d0cc02258f, 56, 53, 7217-7232, 2020.07, Dynamic nuclear polarization with photo-excited triplet electrons (triplet-DNP) has the potential to enhance the sensitivity of nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) at a moderate temperature. While many efforts have been devoted to achieving a large nuclear polarization based on triplet-DNP, the application of triplet-DNP has been limited to nuclear physics experiments. The recent introduction of materials chemistry into the field of triplet-DNP has achieved air-stable and water-soluble polarizing agents as well as the hyperpolarization of nanomaterials with a large surface area such as nanoporous metal-organic frameworks (MOFs) and nanocrystal dispersion in water. This Feature Article overviews the recently-emerged materials chemistry of triplet-DNP that paves new paths towards unprecedented biological and medical applications.. |
| 40. |
Jie Zhang, Hironori Kouno, Nobuhiro Yanai, Daichi Eguchi, Tatsuo Nakagawa, Nobuo Kimizuka, Toshiharu Teranishi, Masanori Sakamoto, Number of Surface-Attached Acceptors on a Quantum Dot Impacts Energy Transfer and Photon Upconversion Efficiencies, ACS Photonics, 10.1021/acsphotonics.0c00771, 7, 7, 1876-1884, 2020.07, Composites of organic molecules and inorganic quantum dots (QDs) have emerged as attractive photon upconversion systems that use triplet-triplet annihilation upconversion (TTA-UC). However, the upconversion efficiency of such systems is still far from reaching their theoretical potential. The number of acceptor molecules directly coordinated on a QD (n) should determine triplet-triplet energy transfer (TTET) efficiency (φTTET), which consequently affects the efficiency of TTA-UC, but the research focusing on the n value has been limited. In the present report, the effect of n on TTET from CdSe or CdTe QDs to perylene-3-carboxylic acid (Pe; i.e., acceptor) were systematically investigated. The TTET and TTA-UC efficiencies increase with increasing n. The regulation of n on a QD could provide a straightforward means to realize high-performance TTA-UC. For the molecule/QDs systems, small QDs with a wide band gap are favorable for intrinsic TTET (i.e., TTET in a one-to-one QD-Pe composite system), because intrinsic TTET efficiency is detemined by the triplet energy of QDs. On the other hand, the small QDs limit the n due to the small surface area. Therefore, the proper choices of QDs and acceptors providing both sufficient free energy change for TTET and large n are important to achieve efficient TTA-UC.. |
| 41. |
Risa Iwami, Teppei Yamada, Nobuo Kimizuka, Increased Seebeck Coefficient of [Fe(CN)6]4-/3-Thermocell Based on the selectine Electrostatic Interactions with Cationic Micelles, Chem. Lett.,, 10.1246/cl.200410, 49, 1197-1200, 2020.07. |
| 42. |
Masa Aki Morikawa, Hanyu Yang, Keita Ishiba, Kouta Masutani, Joseph K.H. Hui, Nobuo Kimizuka, A Liquid Arylazopyrazole Derivative as Molecular Solar Thermal Fuel with Long-term Thermal Stability, Chemistry Letters, 10.1246/cl.200171, 49, 6, 736-740, 2020.06, A liquid arylazopyrazole derivative is newly synthesized as molecular solar thermal fuel. It shows efficient trans-to-cis photoisomerization in the neat liquid state, with the cis-isomer having a significantly longer thermal half-life (t1/2 = 3,069 h, at 25 °C). It overcomes the limited thermal stability of the corresponding liquid cis-azobenzene derivative (t1/2 = 16 h) and marked a gravimetric energy density of 41 kJ¢mol11, which meets the requirement for thermophysical heat storage applications.. |
| 43. |
Hirotaka Inoue, Yimin Liang, Teppei Yamada, Nobuo Kimizuka, Enhanced Seebeck coefficients of thermocells by heat-induced deposition of I3-/hydrophobized α-cyclodextrin complexes on electrodes, Chemical Communications, 10.1039/d0cc02356f, 56, 51, 7013-7016, 2020.06, Ethylated α-cyclodextrin (Et18-α-CD) is used as a host matrix for I-/I3- thermocells. Although Et18-α-CD is not soluble in water at ambient temperature, it becomes soluble by complexation of the I3- anion. Meanwhile, the complex is precipitated upon elevating the temperature. The change in thermo-responsive solubility of the I3-/Et18-α-CD complex increases the Seebeck coefficient (Se) of the thermocell up to 2.6 mV K-1. The underlying mechanism of the increased Se is elucidated by UV-vis spectroscopy, Raman spectroscopy, and electrochemical measurements. This result shows the temperature-dependent solubility changes of redox-active species as a potential means to improve the performance of electrochemical thermocells. This journal is. |
| 44. |
Rena Haruki, Yoichi Sasaki, Kouta Masutani, Nobuhiro Yanai, Nobuo Kimizuka, Leaping across the visible range
near-infrared-to-violet photon upconversion employing a silyl-substituted anthracene, Chemical Communications, 10.1039/d0cc02240c, 56, 51, 7017-7020, 2020.06, Upconverting near-infrared (NIR) light (λ > 700 nm) to violet light (λ |
| 45. |
Yusuke Kawashima, Hironori Kouno, Kana Orihashi, Koki Nishimura, Nobuhiro Yanai, Nobuhiro Yanai, Nobuo Kimizuka, Visible-to-UV photon upconversion in air-saturated water by multicomponent co-assembly, Molecular Systems Design and Engineering, 10.1039/d0me00003e, 5, 4, 792-796, 2020.05, Air-stable, visible-to-UV photon upconversion based on triplet-triplet annihilation (TTA-UC) in water has been an outstanding issue despite its importance in a wide range of applications. This is achieved by giving oxygen barrier properties to cationic acceptor self-assemblies through ion complex formation with anionic fatty acids, i.e., supramolecular crowding. This journal is. |
| 46. |
Karina Shimizu, Shota Hisamitsu, Nobuhiro Yanai, Nobuo Kimizuka, José N. Canongia Lopes, Photon Upconversion in TTA-Inducing Ionic Liquids
Pinpointing the Role of IL Nanostructured Media Using MD Simulations, The journal of physical chemistry. B, 10.1021/acs.jpcb.0c00768, 124, 15, 3137-3144, 2020.04, The use of task-specific chromophoric ionic liquids as energy transfer media in triplet-triplet annihilation photon upconversion (TTA-UC) processes has produced several examples of systems with signifficantly enhanced performances. In this work, we use molecular dynamics simulations to probe the relation between the nanostructure of chromophoric ionic liquids and their ability to achieve high TTA-UC quantum yields. The existing atomistic and systematic force fields commonly used to model different ionic liquids are extended to include substituted anthracene moieties, thus allowing the modeling of several chromophoric ionic liquids. The simulation results show that the polar network of the ionic liquids can orient the anthracene moieties within the nonpolar domains preventing direct contacts between them but allowing orientations at the optimal distance for triplet energy migration.. |
| 47. |
Hironori Kouno, Kana Orihashi, Koki Nishimura, Yusuke Kawashima, Kenichiro Tateishi, Tomohiro Uesaka, Nobuo Kimizuka, Nobuhiro Yanai, Triplet dynamic nuclear polarization of crystalline ice using water-soluble polarizing agents, Chemical Communications, 10.1039/d0cc00836b, 56, 26, 3717-3720, 2020.04, Triplet dynamic nuclear polarization (triplet-DNP) allows hyperpolarization at a moderate temperature. While the triplet-DNP of water is strongly desired, water-soluble triplet polarizing agents have not yet been reported. Herein, the first example of triplet-DNP of crystalline ice is demonstrated by molecularly dispersing a novel water-soluble polarizing agent into ice.. |
| 48. |
Ryosuke Yamamoto, Yusuke Minami, Joseph K.H. Hui, Masa Aki Morikawa, Nobuo Kimizuka, Enhanced Electric Polarization and Polar Switching of Dipolar Aromatic Liquids Confined in Supramolecular Gel Networks, Journal of the American Chemical Society, 10.1021/jacs.9b11276, 142, 3, 1424-1432, 2020.01, Dipolar aromatic liquids confined in the interstitial domains of chiral organogels show significantly enhanced electric polarization, as compared with those of pure liquids alone or organogels formed with nonpolar liquids. Intriguingly, nitrobenzene gels showed a supramolecular polar switching phenomenon; i.e., hysteresis in the polarization (P)-electric field (E) curves was observed for the gel above the melting point of the solvent. This indicates that the nitrobenzene molecules confined in the chiral nanofibrous gel networks exert macroscopic polarization whose direction is inversed depending on the direction of the external electric field. The anomalously enhanced electric polarization and polar switching phenomenon of supramolecular gels in varied solvents are scrutinized by the positive-up-negative-down (PUND) measurements, and the interactions between the gel nanofibers and the polar solvent molecules play crucial roles for the emergence of the polar switching phenomenon. This work presents for the first time that dipolar liquid molecules filling the interstitial space of supramolecular gels exhibit a significant confinement effect. It provides a new perspective to design electric-field-responsive soft materials based on the functional liquid domains confined in their porous networks.. |
| 49. |
Biplab Joarder, Arijit Mallick, Yoichi Sasaki, Mika Kinoshita, Rena Haruki, Yusuke Kawashima, Nobuhiro Yanai, Nobuo Kimizuka, Near-Infrared-to-Visible Photon Upconversion by Introducing an S−T Absorption Sensitizer into a Metal-Organic Framework, ChemNanoMat, 10.1002/cnma.202000019, 2020.01, Triplet-triplet annihilation-based photon upconversion (TTA-UC) of near-infrared (NIR) light to visible light in the solid-state remains as a great challenge due to the sensitizer aggregation that impedes the efficient triplet energy transfer. Herein, we successfully introduce a molecular sensitizer exhibiting direct singlet-to-triplet (S–T) absorption into a new emitter-based metal-organic framework (MOF) to achieve an efficient triplet sensitization and a NIR-to-visible TTA-UC in the solid-state.. |
| 50. |
Ryosuke Yamamoto, Nobuo Kimizuka, Polar switching of dipolar molecules induced by solid dispersion-to-organogel phase transition, Chemistry Letters, 10.1246/cl.190950, 49, 3, 267-271, 2020.01, A lipophilic L-glutamate-derived gelator having multiple amide linkages is dissolved in liquid 1-methoxy-4-nitrobenzene (MNB) by heating. Upon cooling this solution below ca. 337K, a sol-to-gel transition occurs and the liquid MNB molecules are confined in the self-assembled gel networks. This organogel shows significant enhancement of dipolar polarization and hysteresis is observed in the polarization (P)-electric field (E) curves. The cooling of the gel to ambient temperature affords a solid dispersion phase, which does not show such enhanced dipolar polarization nor the P-E hysteresis. The electric field-induced macroscopic polarization of MNB molecules thus occurs only when they are in the liquid phase and confined in the interstitial domains of the MNB gel.. |
| 51. |
Ryosuke Yamamoto, Shigenori Fujikawa, Nobuo Kimizuka, Polar switching of dipolar molecules confined in submicron- And micron-sized pores in polymer films, Chemistry Letters, 10.1246/cl.190917, 49, 3, 255-259, 2020.01, p-Nitroanisole (pNA) confined in submicron- and micron-sized pores in polyimide films shows enhanced dipolar polarization and polar switching characteristics in the liquid state, as revealed by hysteresis in the polarization (P)-electric field (E) curves. They reflect interface-induced orientational polarization of confined pNA molecules, i.e. inversion of molecular orientation depending on the direction of the external electric field. Such an enhanced orientational polarization is not observed for the bulk pNA nor pristine polyimide films, and interactions between the confined pNA molecules and the surface of the pores are indispensable for the polar switching phenomena.. |
| 52. |
Nobuhiro Yanai, Nobuo Kimizuka, Stimuli-Responsive Molecular Photon Upconversion, Angewandte Chemie - International Edition, 10.1002/anie.202001325, 2020.01, The addition of stimuli-responsiveness to anti-Stokes emission provides a unique platform for biosensing and chemosensing. Particularly, stimuli-responsive photon upconversion based on triplet–triplet annihilation (TTA-UC) is promising due to its occurrence at low excitation intensity with high efficiency. This Minireview summarizes the recent developments of TTA-UC switching by external stimuli such as temperature, oxygen, chemicals, light, electric field, and mechanical force. For the systematic understanding of the underlying general mechanisms, the switching mechanisms are categorized into four types: 1) aggregation-induced UC; 2) assembly-induced air-stable UC; 3) diffusion-controlled UC; and 4) energy-transfer-controlled UC. The development of stimuli-responsive smart TTA-UC systems would enable sensing with unprecedented sensitivity and selectivity, and expand the scope of TTA-UC photochemistry by combination with supramolecular chemistry, materials chemistry, mechanochemistry, and biochemistry.. |
| 53. |
Yoichi Sasaki, Mio Oshikawa, Pankaj Bharmoria, Hironori Kouno, Akiko Hayashi-Takagi, Moritoshi Sato, Itsuki Ajioka, Nobuhiro Yanai, Nobuo Kimizuka, Near-Infrared Optogenetic Genome Engineering Based on Photon-Upconversion Hydrogels, Angewandte Chemie - International Edition, 10.1002/anie.201911025, 58, 49, 17827-17833, 2019.12, Photon upconversion (UC) from near-infrared (NIR) light to visible light has enabled optogenetic manipulations in deep tissues. However, materials for NIR optogenetics have been limited to inorganic UC nanoparticles. Herein, NIR-light-triggered optogenetics using biocompatible, organic TTA-UC hydrogels is reported. To achieve triplet sensitization even in highly viscous hydrogel matrices, a NIR-absorbing complex is covalently linked with energy-pooling acceptor chromophores, which significantly elongates the donor triplet lifetime. The donor and acceptor are solubilized in hydrogels formed from biocompatible Pluronic F127 micelles, and heat treatment endows the excited triplets in the hydrogel with remarkable oxygen tolerance. Combined with photoactivatable Cre recombinase technology, NIR-light stimulation successfully performs genome engineering resulting in the formation of dendritic-spine-like structures of hippocampal neurons.. |
| 54. |
Shota Hisamitsu, Junji Miyano Keisuke Okumura Joseph Ka‐Ho Hui Nobuhiro Yanai Nobuo Kimizuka, Visible‐to‐UV Photon Upconversion in Nanostructured Chromophoric Ionic Liquids, Chemistry Open, 10.1002/open.201900304, 9, 14-17, 2019.11. |
| 55. |
Yimin Liang, Joseph K.H. Hui, Teppei Yamada, Nobuo Kimizuka, Electrochemical Thermoelectric Conversion with Polysulfide as Redox Species, ChemSusChem, 10.1002/cssc.201901566, 12, 17, 4014-4020, 2019.09, Thermocells convert waste heat to electricity without any pollution; however, the high cost and corrosivity of redox species hinder their commercialization. In this work, a thermocell that utilizes abundant polysulfide as redox species was demonstrated for the first time. 1-Butyl-1-methylpyrrolidinium polysulfide [(P14)2S3] was synthesized, and the redox species were prepared by the addition of sulfur to the (P14)2S3 solution in DMSO. In thermoelectric measurements, the Seebeck coefficient changed from −0.68 to +0.5 mV K−1 through addition of sulfur to the cell. Operando UV/Vis spectroscopy and open-circuit voltage analysis revealed that this effect was attributed to the change in the dominating redox reactions by the addition of sulfur. This result also provides a thermodynamic view on polysulfides electrochemistry, which is of high importance for lithium–sulfur batteries.. |
| 56. |
Deepak Asthana, Shota Hisamitsu, Masa-aki Morikawa, Pengfei Duan, Takuya Nakashima, Tsuyoshi Kawai, Nobuhiro Yanai*, Nobuo Kimizuka, Aqueous Photon Upconversion by Anionic Acceptors Self-Assembled on Cationic Bilayer Membranes with a Long Triplet Lifetime, Organic Materials, 10.1055/s-0039-3400250, 1, 43-49, 2019.09. |
| 57. |
Koki Nishimura, Hironori Kouno, Kenichiro Tateishi, Tomohiro Uesaka, Keiko Ideta, Nobuo Kimizuka, Nobuhiro Yanai, Triplet dynamic nuclear polarization of nanocrystals dispersed in water at room temperature, Physical chemistry chemical physics : PCCP, 10.1039/c9cp03330k, 21, 30, 16408-16412, 2019.08, While dynamic nuclear polarization using photo-excited triplet electrons (triplet-DNP) can improve the sensitivity of nuclear magnetic resonance at room temperature, it has not been carried out in water. Here, we report the first example of triplet-DNP in water by downsizing the conventional bulk crystals to nanocrystals.. |
| 58. |
Hak Lae Lee, Jung Hwan Park, Hyun Seok Choe, Myung Soo Lee, Jeong Min Park, Naoyuki Harada, Yoichi Sasaki, Nobuhiro Yanai, Nobuo Kimizuka, Jintao Zhu, Suk Ho Bhang, Jae Hyuk Kim, Upconverting Oil-Laden Hollow Mesoporous Silica Microcapsules for Anti-Stokes-Based Biophotonic Applications, ACS Applied Materials and Interfaces, 10.1021/acsami.9b06620, 11, 30, 26571-26580, 2019.07, A recyclable, aqueous phase functioning and biocompatible photon upconverting system is developed. Hollow mesoporous silica microcapsules (HMSMs) with ordered radial mesochannels were employed, for the first time, as vehicles for the post-encapsulation of oil phase triplet-triplet annihilation upconversion (TTA-UC), with the capability of homogeneous suspension in water. In-depth characterization of such upconverting oil-laden HMSMs (UC-HMSMs) showed that the mesoporous silica shells reversibly stabilized the encapsulated UC oil in water to allow efficient upconverted emission, even under aerated conditions. In addition, the UC-HMSMs were found to actively bind to the surface of human mesenchymal stem cells without significant cytotoxicity and displayed upconverted bright blue emission under 640 nm excitation, indicating a potential of our new TTA-UC system in biophotonic applications. These findings reveal the great promise of UC-HMSMs to serve as ideal vehicles not only for ultralow-power in vivo imaging but also for stem cell labeling, to facilitate the tracking of tumor cells in animal models.. |
| 59. |
Teppei Yamada, Toshiki Eguchi, Taro Wakiyama, Tetsuya Narushima, Hiromi Okamoto, Nobuo Kimizuka, Synthesis of Chiral Labtb and Visualization of Its Enantiomeric Excess by Induced Circular Dichroism Imaging, Chemistry - A European Journal, 10.1002/chem.201900329, 25, 27, 6698-6702, 2019.05, Crystalline particles of a microporous, robust, and chiral metal–organic framework (MOF) were synthesized and their enantiomer excess (ee) was visualized for each microparticle by CD imaging. Labtb, a thermally and chemically robust MOF, was employed in this study because it shows a chiral space group. Although Labtb has been obtained as a racemic conglomerate, enantioselective synthesis of Labtb was achieved via a chiral precursor complex consisting of lanthanum and homochiral phenylalanine. Methyl orange (MO) was introduced into the micropores of chiral Labtb, which showed a strong induced CD signal for the absorption band of MO chromophores. High ee of the chiral Labtb was revealed by microscopic CD observation at the particle-level. This result provides a facile way to obtain a robust MOF that has chiral nanospace.. |
| 60. |
Yufeng Yang, Masatoshi Ishida, Yuhsuke Yasutake, Susumu Fukatsu, Chihoko Fukakusa, Masa-Aki Morikawa, Teppei Yamada, Nobuo Kimizuka, Hiroyuki Furuta, Hierarchical Hybrid Metal-Organic Frameworks
Tuning the Visible/Near-Infrared Optical Properties by a Combination of Porphyrin and Its Isomer Units, Inorganic Chemistry, 10.1021/acs.inorgchem.9b00251, 58, 7, 4647-4656, 2019.04, Hybrid metal-organic frameworks (MOFs) with core/shell-like hierarchical structure comprised of zirconium metal and porphyrin (e.g., TPP) and its isomer, N-confused porphyrin (NCP), were synthesized through a seed-mediated reaction. The hierarchical structures of hybrid MOFs were characterized by the microscopic image analyses (e.g., scanning electron microscope (SEM), energy dispersive X-ray (EDX) spectrometry, and confocal laser scanning microscope (CLSM)). Taking advantage of the intrinsic light-harvesting properties of the porphyrin dye and the N-confused isomer, changing the core/shell layer structures of hybrid MOFs allows for tuning of the visible-to-near-infrared (NIR) absorption/emission characters, excited-state energy migrations, and photosensitization capabilities. The Förster energy transfer event occurring in the bulk MOF samples by photoexcitation enabled us to control the photoinduced singlet oxygen generation through the comprehensive light-harvesting ability of these hybrid porphyrinic MOFs. Therefore, implementation of a precisely designed porphyrin "substitute" into the MOF-based materials indeed provides a new mimic of the photosynthetic pigment system and should be potentially applicable for solar-light-driven devices.. |
| 61. |
Hironori Kouno, Yoichi Sasaki, Nobuhiro Yanai, Nobuo Kimizuka, Supramolecular Crowding Can Avoid Oxygen Quenching of Photon Upconversion in Water, Chemistry - A European Journal, 10.1002/chem.201900795, 25, 24, 2019.04, Invited for the cover of this issue is the group of Nobuhiro Yanai and Nobuo Kimizuka at Kyushu University. The image depicts the photon upconverting self-assemblies of amphiphilic chromophores in water. Read the full text of the article at 10.1002/chem.201806076.. |
| 62. |
Hironori Kouno, Yusuke Kawashima, Kenichiro Tateishi, Tomohiro Uesaka, Nobuo Kimizuka, Nobuhiro Yanai,, Non-Pentacene Polarizing Agents with Improved Air-Stability for Triplet Dynamic Nuclear Polarization at Room Temperature, J. Phys. Chem. Lett., , https://pubs.acs.org/doi/pdf/10.1021/acs.jpclett.9b00480, 10, 2208-2213, 2019.04. |
| 63. |
Hironori Kouno, Yoichi Sasaki, Nobuhiro Yanai, Nobuo Kimizuka, Supramolecular Crowding Can Avoid Oxygen Quenching of Photon Upconversion in Water, Chemistry - A European Journal, 10.1002/chem.201806076, 25, 24, 6124-6130, 2019.04, A common challenge in chemistry that deals with photoexcited states is to avoid oxygen quenching. This is crucial for hot research fields such as photon upconversion (UC), in which oxygen-sensitive triplet excited states play pivotal roles. However, methods to avoid oxygen quenching in aqueous media are far more limited despite eagerly anticipated catalytic and biological applications. This work introduces a simple strategy to achieve air-stable triplet–triplet annihilation (TTA)-based UC in water, namely, supramolecular crowding. Amphiphilic cationic acceptor molecules and anions with long alkyl chains co-assemble in water in which hydrophobic donor molecules are molecularly dispersed. Despite the common notion that oxygen molecules diffuse readily across hydrophobic domains in water, more than 80 % of the TTA-UC emission of the obtained hydrophobic co-assemblies is maintained in air-saturated water. This work demonstrates the new promising potential of supramolecular chemistry for photophysical and photochemical functions with oxygen-sensitive species.. |
| 64. |
F. Meinardi, M. Ballabio, Nobuhiro Yanai, Nobuo Kimizuka, A. Bianchi, M. Mauri, R. Simonutti, A. Ronchi, M. Campione, A. Monguzzi, Quasi-thresholdless Photon Upconversion in Metal-Organic Framework Nanocrystals, Nano Letters, 10.1021/acs.nanolett.9b00543, 19, 3, 2169-2177, 2019.03, Photon upconversion based on sensitized triplet-triplet annihilation (sTTA) is considered as a promising strategy for the development of light-managing materials aimed to enhance the performance of solar devices by recovering unused low-energy photons. Here, we demonstrate that, thanks to the fast diffusion of excitons, the creation of triplet pairs in metal-organic framework nanocrystals (nMOFs) with size smaller than the exciton diffusion length implies a 100% TTA yield regardless of the illumination condition. This makes each nMOF a thresholdless, single-unit annihilator. We develop a kinetic model for describing the upconversion dynamics in a nanocrystals ensemble, which allows us to define the threshold excitation intensity Ith box required to reach the maximum conversion yield. For materials based on thresholdless annihilators, Ith box is determined by the statistical distribution of the excitation energy among nanocrystals. The model is validated by fabricating a nanocomposite material based on nMOFs, which shows efficient upconversion under a few percent of solar irradiance, matching the requirements of real life solar technologies. The statistical analysis reproduces the experimental findings, and represents a general tool for predicting the optimal compromise between dimensions and concentration of nMOFs with a given crystalline structure that minimizes the irradiance at which the system starts to fully operate.. |
| 65. |
Rena Haruki, Hironori Kouno, Masanori Hosoyamada, Taku Ogawa, Nobuhiro Yanai, Nobuo Kimizuka, Oligo(ethylene glycol)/alkyl-modified Chromophore Assemblies for Photon Upconversion in Water, Chemistry - An Asian Journal, 10.1002/asia.201801666, 2019.01, Molecular self-assembly is a powerful means to construct nanoscale materials with advanced photophysical properties. Although the protection of the photo-excited states from oxygen quenching is a critical issue, it still has been in an early phase of development. In this work, we demonstrate that a simple and typical molecular design for aqueous supramolecular assembly, modification of the chromophoric unit with hydrophilic oligo(ethylene glycol) chains and hydrophobic alkyl chains, is effective to avoid oxygen quenching of triplet–triplet annihilation-based photon upconversion (TTA-UC). While a TTA-UC emission is completely quenched when the donor and acceptor are molecularly dispersed in chloroform, their aqueous co-assemblies exhibit a clear upconverted emission in air-saturated water even under extremely low chromophore concentrations down to 40 μm. The generalization of this nano-encapsulation approach offers new functions and applications using oxygen-sensitive species for supramolecular chemistry.. |
| 66. |
Takashi Kitao, Yujiro Nagasaka, Masanobu Karasawa, Toshiki Eguchi, Nobuo Kimizuka, Kazuyuki Ishii, Teppei Yamada, Takashi Uemura, Transcription of Chirality from Metal-Organic Framework to Polythiophene, Journal of the American Chemical Society, 10.1021/jacs.9b10880, 2019.01, Here, we report an unprecedented chirality transfer from a metal-organic framework (MOF) to a polymer. In this work, unsubstituted polythiophene (PTh) was prepared in the nanochannels of a chiral MOF. Circular dichroism spectroscopy revealed that nanoconfinement of the polymer chains could endow optically inactive PTh with a chiral nature. The thickness of polymer chain assemblies could be controlled by tuning the loading amount of PTh, which resulted in a drastic change in the chiroptical properties. Note that PTh liberated from the host still exhibited chirality even without the chiral support. Remarkably, the recovered PTh presented high thermal stability of chirality up to 250 °C. Our findings show that the encapsulation of the polymer chains in chiral MOFs is a simple and effective methodology not only to express the chirality of polymers but also to elucidate the inter- A nd intrachain chirality in polymer assemblies.. |
| 67. |
Shota Hisamitsu, Junji Miyano, Keisuke Okumura, Joseph Ka Ho Hui, Nobuhiro Yanai, Nobuo Kimizuka, Visible-to-UV Photon Upconversion in Nanostructured Chromophoric Ionic Liquids, ChemistryOpen, 10.1002/open.201900304, 2019.01, Visible-to-ultraviolet (vis-to-UV) triplet-triplet annihilation based photon upconversion (TTA-UC) is achieved in a non-volatile chromophoric ionic liquid (IL) for the first time. A novel IL is synthesized by combining UV-emitting anion 4-(2-phenyloxazol-5-yl)benzenesulfonate (PPOS) and trihexyltetradecylphosphonium cation (P66614). The nanostructured organization of chromophoric anions is demonstrated by synchrotron X-ray and optical measurements. When the IL is doped with a triplet sensitizer tris(2-phenylpyridinato)iridium(III) (Ir(ppy)3), the visible-to-UV TTA-UC with a relatively low threshold excitation intensity of 61 mW cm−2 is achieved. This is due to a large triplet diffusion coefficient in the IL (1.4×10−7 cm2 s−1) as well as a high absorption coefficient 15 cm−1 and a long PPOS triplet lifetime of 1.55 ms, all implemented in the condensed IL system. This work demonstrates the unique potential of ILs to control chromophore arrangements for desired functions.. |
| 68. |
Keisuke Okumura, Nobuhiro Yanai, Nobuo Kimizuka, Visible-to-UV photon upconversion sensitized by lead halide perovskite nanocrystals, Chemistry Letters, 10.1246/cl.190473, 48, 11, 1347-1350, 2019.01, Visible-to-UV photon upconversion based on triplet-triplet annihilation (TTA-UC) sensitized by lead halide perovskite nanocrystals is demonstrated for the first time. The surface modification of nanocrystals with energy transmitter ligands plays a key role in the effective triplet sensitization, resulting in high TTA-UC efficiency over 4%. This work proves the promising potential of perovskite nanocrystals as a versatile, next-generation triplet sensitizer.. |
| 69. |
Yimin Liang, Hongyao Zhou, Teppei Yamada, Nobuo Kimizuka, A theoretical basis for the enhancement of Seebeck coefficients in supramolecular thermocells, Bulletin of the Chemical Society of Japan, 10.1246/bcsj.20190062, 92, 7, 1142-1147, 2019.01, Seebeck coefficients (Se) of supramolecular thermocells harnessing four kinds of cyclodextrins as host molecules were investigated. Theoretical analysis revealed that association enthalpy between the hosts and triiodide has a major influence on the Seebeck coefficients of the thermocells. Thermodynamic parameters of hostguest associations were evaluated by isothermal titration calorimetry, which is in good agreement with the theoretically estimated values from thermocell measurements. This result provides a guideline to estimate Seebeck coefficient of supramolecular thermocells and to determine the thermodynamic parameters.. |
| 70. |
Nobuhiro Yanai, Kengo Suzuki, Taku Ogawa, Yoichi Sasaki, Naoyuki Harada, Nobuo Kimizuka, Absolute Method to Certify Quantum Yields of Photon Upconversion via Triplet-Triplet Annihilation, Journal of Physical Chemistry A, 10.1021/acs.jpca.9b08636, 2019.01, For the consistent development of the field of photon upconversion via triplet-triplet annihilation (TTA-UC), it is pivotal to know the true quantum yield of TTA-UC emission. Although TTA-UC quantum yields have been determined by common relative measurements using quantum yield standards, there is still a discrepancy between the reported values even for the benchmark sensitizer-emitter pair of platinum(II) octaethylporphyrin (PtOEP) and 9,10-diphenylanthracene (DPA). Here, to resolve this situation, we show a method to obtain the absolute quantum yield of TTA-UC photoluminescence. The difficulty in obtaining absolute TTA-UC quantum yield by the integrating sphere measurement is to accurately calibrate the contribution of reabsorbed upconverted emission by triplet sensitizers. The reabsorption correction is successfully carried out by comparing sensitizer phosphorescence with and without the integrating sphere. An absolute TTA-UC quantum yield of the PtOEP-DPA pair is obtained as 36%, which shows a good agreement with the relative TTA-UC quantum yield. An absolute TTA-UC quantum yield of another red-to-blue TTA-UC pair, platinum(II) meso-tetraphenyltetrabenzoporphyrin (PtTPBP) and 2,5,8,11-tetra-tert-butylperylene (TTBP), is obtained as 27%. These absolute TTA-UC quantum yields can be used as certified values to check the measurement setup and sample condition for determining relative TTA-UC quantum yields in each laboratory.. |
| 71. |
Zhihang Wang, Raul Losantos, Diego Sampedro, Masa Aki Morikawa, Karl Börjesson, Nobuo Kimizuka, Kasper Moth-Poulsen, Demonstration of an azobenzene derivative based solar thermal energy storage system, Journal of Materials Chemistry A, 10.1039/c9ta04905c, 7, 25, 15042-15047, 2019.01, Molecules capable of reversible storage of solar energy have recently attracted increasing interest, and are often referred to as molecular solar thermal energy storage (MOST) systems. Azobenzene derivatives have great potential as an active MOST candidate. However, an operating lab scale experiment including solar energy capture/storage and release has still not been demonstrated. In the present work, a liquid azobenzene derivative is tested comprehensively for this purpose. The system features several attractive properties, such as a long energy storage half-life (40 h) at room temperature, as well as an excellent robustness demonstrated by optically charging and discharging the molecule over 203 cycles without any sign of degradation (total operation time of 23 h). Successful measurements of solar energy storage under simulated sunlight in a microfluidic chip device have been achieved. The identification of two heterogeneous catalyst systems during testing enabled the construction of a fixed bed flow reactor demonstrating catalyzed back-conversion from cis to trans azobenzene at room temperature under flow conditions. The working mechanism of the more suitable catalytic candidate was rationalized by detailed density functional theory (DFT) calculations. Thus, this work provides detailed insights into the azobenzene based MOST candidate and identifies where the system has to be improved for future solar energy storage applications.. |
| 72. |
Tejwant Singh Kang, Masa Aki Morikawa, Nobuo Kimizuka, Liquid crystalline microspheres of azobenzene amphiphiles formed by thermally induced pH changes in binary water-hydrolytic ionic liquid media, Chemical Communications, 10.1039/c9cc01731c, 55, 38, 5459-5462, 2019.01, Anionic azobenzene-containing bilayered membranes dispersed in binary water-ionic liquid (IL) media undergo proton-responsive transformation into liquid crystalline microspheres (LCMs). This transformation was induced by protons released by the heat-induced hydrolysis of tetrafluoroborate ions in the ILs. This work demonstrates the first beneficial use of hydrolysis-susceptible ILs in chemistry.. |
| 73. |
Teppei Yamada, Kanji Shiraishi, Nobuo Kimizuka, Synthesis of a redox-active metalorganic framework MIL-116(Fe) and its lithium ion battery cathode properties, Chemistry Letters, 10.1246/cl.190613, 48, 11, 1379-1382, 2019.01, A metalorganic framework of iron (III) and mellitic acid was synthesized. The crystal structure of the MOF determined by single crystal X-ray analysis was isostructural to MIL-116. It was applied as a lithium-ion battery cathode active material and showed a performance of ca. 100 mAh/g after 60 cycles. It also showed capacitance of 43 mAh/g at a 10 C rate.. |
| 74. |
Saiya Fujiwara, Masanori Hosoyamada, Kenichiro Tateishi, Tomohiro Uesaka, Keiko Ideta, Nobuo Kimizuka, Nobuhiro Yanai, Dynamic Nuclear Polarization of Metal-Organic Frameworks Using Photoexcited Triplet Electrons, Journal of the American Chemical Society, 10.1021/jacs.8b10121, 140, 46, 15606-15610, 2018.11, While dynamic nuclear polarization based on photoexcited triplet electrons (triplet-DNP) has the potential to hyperpolarize nuclear spins of target substrates in the low magnetic field at room temperature, there has been no triplet-DNP system offering structural rigidity and substrate accessibility. Here, we report the first example of triplet-DNP of nanoporous metal-organic frameworks. Accommodation of a carboxylate-modified pentacene derivative in a partially deuterated ZIF-8 (D-ZIF-8) results in a clear 1H NMR signal enhancement over thermal equilibrium.. |
| 75. |
Teppei Yamada, Xiaopeng Zou, Yimin Liang, Nobuo Kimizuka, A supramolecular thermocell consisting of ferrocenecarboxylate and β-cyclodextrin that has a negative Seebeck coefficient, Polymer Journal, 10.1038/s41428-018-0061-7, 50, 8, 771-774, 2018.08, A p-type supramolecular thermocell was constructed with a ferrocenecarboxylate/ferroceniumcarboxylate pair. The Seebeck coefficient of the cell was improved from −0.86 to −1.20 mV K−1 by the addition of β-cyclodextrin. Isothermal titration calorimetry and a theoretical investigation demonstrated that the host–guest interaction increased the Seebeck coefficient.. |
| 76. |
Marleen Häring, Alex Abramov, Keisuke Okumura, Indrajit Ghosh, Burkhard König, Nobuhiro Yanai, Nobuo Kimizuka, David Díaz Díaz, Air-Sensitive Photoredox Catalysis Performed under Aerobic Conditions in Gel Networks, Journal of Organic Chemistry, 10.1021/acs.joc.8b00797, 83, 15, 7928-7938, 2018.08, In this work, we demonstrate that useful C-C bond-forming photoredox catalysis can be performed in air using easily prepared gel networks as reaction media to give similar results as are obtained under inert atmosphere conditions. These reactions are completely inhibited in homogeneous solution in air. However, the supramolecular fibrillar gel networks confine the reactants and block oxygen diffusion, allowing air-sensitive catalytic activity under ambient conditions. We investigate the mechanism of this remarkable protection, focusing on the boundary effect in the self-assembled supramolecular gels that enhances the rates of productive reactions over diffusion-controlled quenching of excited states. Our observations suggest the occurrence of triplet-sensitized chemical reactions in the gel networks within the compartmentalized solvent pools held between the nanofibers. The combination of enhanced viscosity and added interfaces in supramolecular gel media seems to be a key factor in facilitating the reactions under aerobic conditions.. |
| 77. |
Pankaj Bharmoria, Shota Hisamitsu, Hisanori Nagatomi, Taku Ogawa, Masa-Aki Morikawa, Nobuhiro Yanai, Nobuo Kimizuka, Simple and Versatile Platform for Air-Tolerant Photon Upconverting Hydrogels by Biopolymer-Surfactant-Chromophore Co-assembly, Journal of the American Chemical Society, 10.1021/jacs.8b05821, 140, 34, 10848-10855, 2018.08, Exploration of triplet-triplet annihilation based photon upconversion (TTA-UC) in aqueous environments faces difficulty such as chromophores insolubility and deactivation of excited triplets by dissolved oxygen molecules. We propose a new strategy of biopolymer-surfactant-chromophore coassembly to overcome these issues. Air-stable TTA-UC with a high upconversion efficiency of 13.5% was achieved in hydrogel coassembled from gelatin, Triton X-100 and upconverting chromophores (triplet sensitizer and emitter). This is comparable to the highest UC efficiency observed to date for air-saturated aqueous UC systems. Moreover, this is the first example of air-stable TTA-UC in the form of hydrogels, widening the applicability of TTA-UC in biological applications. The keys are two-fold. First, gelatin and the surfactant self-assemble in water to give a developed hierarchical structure with hydrophobic domains which accommodate chromophores up to high concentrations. Second, thick hydrogen-bonding networks of gelatin backbone prevent O2 inflow to the hydrophobic interior, as evidenced by long acceptor triplet lifetime of 4.9 ms. Air-stable TTA-UC was also achieved for gelatin with other nonionic surfactants (Tween 80 and Pluronic f127) and Triton X-100 with other gelling biopolymers (sodium alginate and agarose), demonstrating the versatility of current strategy.. |
| 78. |
Biplab Joarder, Nobuhiro Yanai, Nobuo Kimizuka, Solid-State Photon Upconversion Materials
Structural Integrity and Triplet-Singlet Dual Energy Migration, Journal of Physical Chemistry Letters, 10.1021/acs.jpclett.8b02172, 9, 16, 4613-4624, 2018.08, Triplet-triplet annihilation-based photon upconversion (TTA-UC) is a process wherein longer-wavelength light (lower-energy photons) is converted into shorter-wavelength light (higher-energy photons) under low excitation intensity in multichromophore systems. There have been many reports on highly efficient TTA-UC in solution; however, significant challenges remain in the development of solid-state upconverters in order to explore real-world applications. In this Perspective, we discuss the advantages and challenges of different approaches for TTA-UC in solvent-free solid systems. We consider that the energy migration-based TTA-UC has the potential to achieve ideal materials with high UC efficiency at weak solar irradiance. While the UC performance of such systems is still limited at this moment, we introduce recently developed important concepts to improve it, including kinetic/thermodynamic donor dispersion in acceptor assemblies, defectless crystals, and triplet-singlet dual energy migration. Future integration of these concepts into a single material would realize the ideal TTA-UC system.. |
| 79. |
Taku Ogawa, Masanori Hosoyamada, Brett Yurash, Thuc Quyen Nguyen, Nobuhiro Yanai, Nobuo Kimizuka, Donor-Acceptor-Collector Ternary Crystalline Films for Efficient Solid-State Photon Upconversion, Journal of the American Chemical Society, 10.1021/jacs.8b04542, 140, 28, 8788-8796, 2018.07, It is pivotal to achieve efficient triplet-triplet annihilation based photon upconversion (TTA-UC) in the solid-state for enhancing potentials of renewable energy production devices. However, the UC efficiency of solid materials is largely limited by low fluorescence quantum yields that originate from the aggregation of TTA-UC chromophores and also by severe back energy transfer from the acceptor singlet state to the singlet state of the triplet donor in the condensed state. In this work, to overcome these issues, we introduce a highly fluorescent singlet energy collector as the third component of donor-doped acceptor crystalline films, in which dual energy migration, i.e., triplet energy migration for TTA-UC and succeeding singlet energy migration for transferring energy to a collector, takes place. To demonstrate this scheme, a highly fluorescent singlet energy collector was added as the third component of donor-doped acceptor crystalline films. An anthracene-based acceptor containing alkyl chains and a carboxylic moiety is mixed with the triplet donor Pt(II) octaethylporphyrin (PtOEP) and the energy collector 2,5,8,11-tetra-tert-butylperylene (TTBP) in solution, and simple spin-coating of the mixed solution gives acceptor films of nanofibrous crystals homogeneously doped with PtOEP and TTBP. Interestingly, delocalized singlet excitons in acceptor crystals are found to diffuse effectively over the distance of ∼37 nm. Thanks to this high diffusivity, only 0.5 mol % of doped TTBP can harvest most of the singlet excitons, which successfully doubles the solid-state fluorescent quantum yield of acceptor/TTBP blend films to 76%. Furthermore, since the donor PtOEP and the collector TTBP are separately isolated in the nanofibrous acceptor crystals, the singlet back energy transfer from the collector to the donor is effectively avoided. Such efficient singlet energy collection and inhibited back energy transfer processes result in a large increase of UC efficiency up to 9.0%, offering rational design principles toward ultimately efficient solid-state upconverters.. |
| 80. |
A. Monguzzi, M. Ballabio, N. Yanai, Nobuo Kimizuka, D. Fazzi, M. Campione, F. Meinardi, Correction to
Highly fluorescent metal-organic-framework nanocomposites for photonic applications (Nano Letters (2018) 18:1 (528-534) DOI: 10.1021/acs.nanolett.7b04536), Nano Letters, 10.1021/acs.nanolett.8b01871, 18, 6, 2018.06, On page 531, column 2, there is a typo in eq 2. The correct exponent for the term between parentheses is-6 not6.. |
| 81. |
Taku Ogawa, Nobuhiro Yanai, Hironori Kouno, Nobuo Kimizuka, Kinetically controlled crystal growth approach to enhance triplet energy migration-based photon upconversion, Journal of Photonics for Energy, 10.1117/1.JPE.8.022003, 8, 2, 2018.04, Improving efficiency of triplet-triplet annihilation-based photon upconversion (TTA-UC) in crystalline media is challenging because it usually suffers from the severe aggregation of the donor (sensitizer) molecules in acceptor (emitter) crystals. We show a kinetically controlled crystal growth approach to improve donor dispersibility in acceptor crystals. As the donor-acceptor combination, a benchmark pair of platinum(II) octaethylporphyrin (PtOEP) and 9,10-diphenylanthracene (DPA) is employed. A surfactant-assisted reprecipitation technique is employed, where the concentration of the injected PtOEP-DPA solution holds the key to control dispersibility; at a higher PtOEP-DPA concentration, a rapid crystal growth results in better dispersibility of PtOEP molecules in DPA crystals. The improvement of donor dispersibility significantly enhances the TTA-UC quantum yield. Thus, the inherent function of donor-doped acceptor crystals can be maximized by controlling the crystallization kinetics.. |
| 82. |
Kazuma Mase, Yoichi Sasaki, Yoshimitsu Sagara, Nobuyuki Tamaoki, Christoph Weder, Nobuhiro Yanai, Nobuo Kimizuka, Stimuli-Responsive Dual-Color Photon Upconversion
A Singlet-to-Triplet Absorption Sensitizer in a Soft Luminescent Cyclophane, Angewandte Chemie - International Edition, 10.1002/anie.201712644, 57, 11, 2806-2810, 2018.03, Reversible emission color switching of triplet–triplet annihilation-based photon upconversion (TTA-UC) is achieved by employing an Os complex sensitizer with singlet-to-triplet (S-T) absorption and an asymmetric luminescent cyclophane with switchable emission characteristics. The cyclophane contains the 9,10-bis(phenylethynyl)anthracene unit as an emitter and can assemble into two different structures, a stable crystalline phase and a metastable supercooled nematic phase. The two structures exhibit green and yellow fluorescence, respectively, and can be accessed by distinct heating/cooling sequences. The hybridization of the cyclophane with the Os complex allows near-infrared-to-visible TTA-UC. The large anti-Stokes shift is possible by the direct S-T excitation, which dispenses with the use of a conventional sequence of singlet–singlet absorption and intersystem crossing. The TTA-UC emission color is successfully switched between green and yellow by thermal stimulation.. |
| 83. |
Hisanori Nagatomi, Nobuhiro Yanai, Teppei Yamada, Kanji Shiraishi, Nobuo Kimizuka, Synthesis and Electric Properties of a Two-Dimensional Metal-Organic Framework Based on Phthalocyanine, Chemistry - A European Journal, 10.1002/chem.201705530, 24, 8, 1806-1810, 2018.02, Complexation of copper(II) 2,3,9,10,16,17,23,24-octahydroxy-29H,31H-phthalocyanine (CuPcOH) with copper(II) ions gives a two-dimensional (2D) metal-organic framework (MOF). This is the first report of a phthalocyanine-based MOF. This 2D MOF was obtained as a black powder and showed an electrical conductivity of 1.6×10−6 S cm−1 at 80 °C. When this MOF is used as a cathode of lithium ion battery (LIB), large charge/discharge capacities of 151/128 mAh g−1 were obtained. In addition, it showed a good stability during 200 charge/discharge cycles. The obtained LIB performance mainly originates from the electrically conductive and redox-active framework of the phthalocyanine-based 2D MOF and its hierarchical microporous/mesoporous structure.. |
| 84. |
Shota Hisamitsu, Nobuhiro Yanai, Hironori Kouno, Eisuke Magome, Masaya Matsuki, Teppei Yamada, Angelo Monguzzi, Nobuo Kimizuka, Two-dimensional structural ordering in a chromophoric ionic liquid for triplet energy migration-based photon upconversion, Physical Chemistry Chemical Physics, 10.1039/c7cp06266d, 20, 5, 3233-3240, 2018.02, A novel chromophoric ionic liquid (IL) with two-dimensional (2D) nanostructural order is developed, and its structure-property relationship is investigated by harnessing photon upconversion based on triplet energy migration. An ion pair of 9,10-diphenylanthracene-2-sulphonate (DPAS) and asymmetric quaternary phosphonium ion exhibited both ionic crystal (IC) and supercooled IL phases at room temperature. Single crystal X-ray analysis of the IC phase showed an alternate alignment of polar (ionic) and non-polar (non-ionic) layers, and this layered structure was basically maintained even in the IL phase. The diffusion length of triplet excitons in the IL phase, obtained by the analysis of upconverted emission in succession to triplet-triplet annihilation (TTA), is larger than the domain size estimated from powder X-ray analysis. This suggests that triplet excitons in chromophoric ILs can diffuse over the nanostructured domains.. |
| 85. |
Masaya Matsuki, Teppei Yamada, Shun Dekura, Hiroshi Kitagawa, Nobuo Kimizuka, Enhancement of ionic conductivity in organic ionic plastic crystals by introducing racemic ammonium ions, Chemistry Letters, 10.1246/cl.171181, 47, 4, 497-499, 2018.01, An organic ionic plastic crystal (OIPC) consisting of racemic N1233'Tf2N (1) (N1233' = NR1R2R3R4, R1 = Me, R2 = Et, R3 = n-propyl, R4 = isopropyl, Tf2N = bis(trifluorometha-nesulfonyl)imide) is developed. 1 displays three solid phases in addition to the high-temperature liquid phase, and two intermediate phases are assigned to OIPC by DSC, powder XRD and solid-state NMR measurements. Ionic conductivity of 1 showed increase from the low-temperature region, and diffusion of Tf2N anions was confirmed even at -27°C by NMR spectroscopy. This behavior is distinct from that of symmetric N1223'Tf2N (2), which showed much lower ionic conductivity at low temperatures. The introduction of racemic ions in OIPCs weakens the net intermolecular interactions and it enhances molecular motion and accordingly the ionic conductivity.. |
| 86. |
A. Monguzzi, M. Ballabio, Nobuhiro Yanai, Nobuo Kimizuka, D. Fazzi, M. Campione, F. Meinardi, Highly Fluorescent Metal-Organic-Framework Nanocomposites for Photonic Applications, Nano Letters, 10.1021/acs.nanolett.7b04536, 18, 1, 528-534, 2018.01, Metal-organic frameworks (MOFs) are porous hybrid materials built up from organic ligands coordinated to metal ions or clusters by means of self-assembly strategies. The peculiarity of these materials is the possibility, according to specific synthetic routes, to manipulate both the composition and ligands arrangement in order to control their optical and energy-transport properties. Therefore, optimized MOFs nanocrystals (nano-MOFs) can potentially represent the next generation of luminescent materials with features similar to those of their inorganic predecessors, that is, the colloidal semiconductor quantum dots. The luminescence of fluorescent nano-MOFs is generated through the radiative recombination of ligand molecular excitons. The uniqueness of these nanocrystals is the possibility to pack the ligand chromophores close enough to allow a fast exciton diffusion but sufficiently far from each other preventing the aggregation-induced effects of the organic crystals. In particular, the formation of strongly coupled dimers or excimers is avoided, thus preserving the optical features of the isolated molecule. However, nano-MOFs have a very small fluorescence quantum yield (QY). In order to overcome this limitation and achieve highly emitting systems, we analyzed the fluorescence process in blue emitting nano-MOFs and modeled the diffusion and quenching mechanism of photogenerated singlet excitons. Our results demonstrate that the excitons quenching in nano-MOFs is mainly due to the presence of surface-located, nonradiative recombination centers. In analogy with their inorganic counterparts, we found that the passivation of the nano-MOF surfaces is a straightforward method to enhance the emission efficiency. By embedding the nanocrystals in an inert polymeric host, we observed a +200% increment of the fluorescence QY, thus recovering the emission properties of the isolated ligand in solution.. |
| 87. |
Masaya Matsuki, Teppei Yamada, Nobuhiro Yasuda, Shun Dekura, Hiroshi Kitagawa, Nobuo Kimizuka, Nonpolar-to-Polar Phase Transition of a Chiral Ionic Plastic Crystal and Switch of the Rotation Symmetry, Journal of the American Chemical Society, 10.1021/jacs.7b10249, 140, 1, 291-297, 2018.01, The synthesis of a new ionic plastic crystal, tetraethylammonium-d20 d-10-camphorsulfonate, is reported. The crystal has three solid phases, the structures of which were determined by single-crystal X-ray diffraction (XRD). XRD analysis revealed a phase transition from nonpolar space group P21212 to polar space group P21 with increasing temperature. The dynamics of the d-10-camphorsulfonate anion and the tetraethylammonium-d20 cation was investigated by variable-temperature 1H and 2H solid-state NMR spectroscopy. The anion showed swing motion in high-temperature phases, which is in good agreement with the disorder observed in XRD analysis. The cation showed uniaxial rotation even in the low-temperature phase. The rotation axis of the tetrahedral structure showed a transition from the two-fold axis to the three-fold axis with the phase transition.. |
| 88. |
Hisanori Nagatomi, Nobuhiro Yanai, Nobuo Kimizuka, Reentrant Gel-Sol-Gel transition of a lipophilic Co(II) coordination polymer, Chemistry Letters, 10.1246/cl.170881, 47, 1, 97-99, 2018.01, A reentrant gel-sol-gel phase transition in organic media is achieved for a single-component, thermoresponsive Co(II)-based coordination polymer bridged by suitably designed lipophilic 1,2,4-triazole ligands. Its green chloroform solution at room temperature turns into a blue gel upon heating, whereas it is transformed to a yellow gel by cooling. These unique thermal phase transitions are reversible and occur all by themselves, which originate from the simultaneous pursuit of entropy-driven changes in coordination structures and enthalpydriven interactions between the coordination polymers.. |
| 89. |
Tomoya Shimono, Masaya Matsuki, Teppei Yamada, Masa-Aki Morikawa, Nobuhiro Yasuda, Tsuyohiko Fujigaya, Nobuo Kimizuka, Selective ionic conduction in choline iodide/triiodide solid electrolyte and its application to thermocells, Chemistry Letters, 10.1246/cl.171069, 47, 3, 261-264, 2018.01, A thermocell consisting of choline iodide/triiodide solid electrolyte is developed. Seebeck coefficient of the cell is10.87 mV K11 at ambient temperature, which sign is opposite to that of the aqueous I1/I3 1 cell. The ionic conductivity of I3 1doped choline iodide is higher than that of pure choline iodide by two to four orders of magnitude, reflecting high conductivity of I3 1 in the solid electrolyte. The selective ionic conduction observed in the solid electrolytes provides a novel design principle for the thermoelectric conversion materials.. |
| 90. |
Daisuke Kichise, Kazuma Mase, Shigenori Fujikawa, Nobuhiro Yanai, Nobuo Kimizuka, Specific uniaxial self-assembly of columnar perylene liquid crystals in au nanofin arrays, Chemistry Letters, 10.1246/cl.171228, 47, 3, 354-357, 2018.01, Self-assembly of liquid crystalline tetrakis(2-ethylhexyl) perylene-3,4,9,10-tetracarboxylate (C8PTC) in periodically aligned Au nanofin arrays (Au-NFs) is investigated. C8PTC forms columnar hexagonal liquid crystalline assemblies oriented parallel to the glass substrate, while the in-plane orientation of the long columnar axis is perpendicular to the surface of Au- NFs. This unique alignment reflects the interaction between the aromatic π-surface and the bare gold surface of NFs. This work provides a new perspective to design and control molecular selfassembly confined in the designed surface nanopatterns.. |
| 91. |
H. Zhou, Teppei Yamada, Nobuo Kimizuka, Thermo-electrochemical cells empowered by selective inclusion of redox-active ions by polysaccharides, Sustainable Energy and Fuels, 10.1039/c7se00470b, 2, 2, 472-478, 2018.01, Thermo-electrochemical cells (TECs) are a class of thermoelectric materials that offer high thermoelectric voltage (Seebeck coefficient) with potentially lower costs compared to the conventional thermoelectric materials. To maximize the potential of TECs, we show that the Seebeck coefficient of TECs with a redox pair of I
-
/I
3
-
is enhanced by introducing polymer-ion interactions. Starch and polyvinylpyrrolidone (PVP) are employed as polymeric hosts for I
3
-
ions. The effective concentration of free I
3
-
ions in the cold cell decreases due to their selective inclusion in host polymers, resulting in an increase of the [I
-
]/[I
3
-
] ratio. Meanwhile in the higher temperature cell, the inclusion of I
3
-
ions by host polymers is less effective and the [I
-
]/[I
3
-
] ratio is mostly determined by the intrinsic equilibrium without polymers. Consequently, the two electrode cells differing in temperature show a considerable difference in the concentration of I
3
-
ions, which causes a significant increase of the Seebeck coefficient up to 1.5 mV K
-1
. The performance of polymer TECs can be tuned depending on the polymer-I
3
-
interactions, and starch showed notable performance as compared to PVP, with increased output power by a factor of two.. |
| 92. |
Masanori Hosoyamada, Nobuhiro Yanai, Keisuke Okumura, Takayuki Uchihashi, Nobuo Kimizuka, Translating MOF chemistry into supramolecular chemistry
Soluble coordination nanofibers showing efficient photon upconversion, Chemical Communications, 10.1039/c8cc01594e, 54, 50, 6828-6831, 2018.01, A method for synthesizing coordination nanofibers by extracting the structural motifs of metal-organic frameworks (MOFs) is demonstrated. In these soluble nanofibers, multiple chromophores with largely different sizes and shapes can be arranged at desired compositions, and excited triplet energy migrates among the densely assembled chromophore arrays, showing an efficient photon upconversion even at very low concentration.. |
| 93. |
Taku Ogawa, Nobuhiro Yanai, Saiya Fujiwara, Thuc Quyen Nguyen, Nobuo Kimizuka, Aggregation-free sensitizer dispersion in rigid ionic crystals for efficient solid-state photon upconversion and demonstration of defect effects, Journal of Materials Chemistry C, 10.1039/c8tc00977e, 6, 21, 5609-5615, 2018.01, Solid-state photon upconversion based on triplet-triplet annihilation (TTA-UC) has attracted much interest because of its potential to circumvent the loss of sub-bandgap photons in photovoltaic cells. There are two important long-standing questions for TTA-UC in solid crystals. Why is the UC efficiency often low in crystalline systems? What is the rational strategy to construct efficient upconverting crystals? In this work, these issues are addressed by employing a simple model system where ionic interactions play a key role. When crystals of an anthracene-based ionic acceptor (emitter) are grown in the presence of anionic donor (sensitizer) molecules, the donor molecules are spontaneously taken up and dispersed homogeneously in acceptor crystals without aggregation. Highly efficient UC is achieved as a consequence of quantitative triplet energy transfer (TET) from the incorporated donor to the surrounding acceptor. It is found that the mechanical grinding of the donor-doped single crystals leads to a significant decrease in UC efficiency, suggesting that trap sites formed in the crystals have a significant negative impact on the UC performance. The important fundamental knowledge obtained from the current ionic crystal system offers rational design guidelines towards the development of efficient TTA-UC systems in the solid-state.. |
| 94. |
Shogo Amemori, Rakesh Kumar Gupta, Marcus Leo Böhm, James Xiao, Uyen Huynh, Tomoki Oyama, Kenji Kaneko, Akshay Rao, Nobuhiro Yanai, Nobuo Kimizuka, Hybridizing semiconductor nanocrystals with metal-organic frameworks for visible and near-infrared photon upconversion, Dalton Transactions, 10.1039/c7dt04794k, 47, 26, 8590-8594, 2018.01, Hybrid materials consisting of semiconductor nanocrystals and metal-organic frameworks (MOFs) were prepared for the first time to achieve photon upconversion based on triplet-triplet annihilation (TTA-UC) in the solid-state, which allowed TTA-UC with large anti-Stokes shifts in the visible and near-infrared regions.. |
| 95. |
Nobuhiro Yanai, Nobuo Kimizuka, New Triplet Sensitization Routes for Photon Upconversion
Thermally Activated Delayed Fluorescence Molecules, Inorganic Nanocrystals, and Singlet-to-Triplet Absorption, Accounts of Chemical Research, 10.1021/acs.accounts.7b00235, 50, 10, 2487-2495, 2017.10, ConspectusPhoton upconversion based on triplet-triplet annihilation (TTA-UC) has attracted much interest because of its possible applications to renewable energy production and biological fields. In particular, the UC of near-infrared (NIR) light to visible (vis) light is imperative to overcome the Shockley-Queisser limit of single-junction photovoltaic cells, and the efficiency of photocatalytic hydrogen production from water can also be improved with the aid of vis-to-ultraviolet (UV) UC. However, both processes have met limitations in the wavelength range, efficiency, and sensitivity for weak incident light.This Account describes recent breakthroughs that solve these major problems, new triplet sensitization routes to significantly enlarge the range of conversion wavelength by minimizing the energy loss during intersystem crossing (ISC) of triplet sensitizers or bypassing the ISC process. The photochemical processes of TTA-UC in general start with the absorption of longer wavelength incident light by triplet sensitizers, which generate the triplet states via ISC. This ISC inevitably accompanies the energy loss of hundreds of millielectronvolts, which significantly limits the TTA-UC with large anti-Stokes shifts.The small S1-T1 gap of molecules showing thermally activated delayed fluorescence (TADF) allows the sensitization of emitters with the highest T1 and S1 energy levels ever employed in TTA-UC, which results in efficient vis-to-UV UC. As alternatives to molecular sensitizers in the NIR region, inorganic nanocrystals with broad NIR absorption bands have recently been shown to work as effective sensitizers for NIR-to-vis TTA-UC. Their small exchange splitting minimizes the energy loss during triplet sensitization. The modification of nanocrystal surfaces with organic acceptors via coordination bonds allows efficient energy transfer between the components and succeeding TTA processes.To remove restrictions on the energy loss during ISC, molecules with direct singlet-to-triplet (S-T) excitation are employed as triplet sensitizers. Although the S-T absorption is spin forbidden, large spin-orbital coupling occurs for appropriately designed metal complexes, which allow S-T absorption in the NIR region with large absorption coefficients. While the triplet lifetime of such S-T absorption sensitizers is often short (less than microsecond), the integration of the molecular sensitizers with emitter assemblies allows facile Dexter energy transfer to the surrounding emitter molecules, leading to efficient NIR-to-vis UC emission through triplet energy migration (TEM) in the condensed state. By judicious modification of the chromophore structures, the first example of NIR-to-blue UC has also been achieved.It is essential to combine these new triplet sensitization routes with an upconverted energy collection (UPCON) approach in molecular assemblies to effectively populate emitter triplets and to overcome remaining issues including back energy transfer. We propose two overall materials designs for the TEM-UPCON strategy, core-shell-shell structures and trilayer structures composed of triplet donor, acceptor, and energy collector. The fusion between triplet science and chemistry of self-assembly would overcome previous difficulties of NIR-to-vis and vis-to-UV TTA-UC toward real-world applications ranging from energy to biology.. |
| 96. |
Keita Ishiba, Daisuke Kichise, HIroaki Iguchi, Masa-aki Morikawa, Nobuo Kimizuka, Self-assembly of Oligo(ethylene oxide)-linked Diammonium Ions with Polyoxometalates into Ordered Polyhedron Nanocrystals in Aqueous Media, CHEMISTRY LETTERS, 10.1246/cl.161124, 46, 4, 430-433, 2017.04. |
| 97. |
Nobuo Kimizuka, Keita Ishiba, 野口 誉夫, Masa-aki Morikawa, K. Kaneko, Hiroaki Iguchi, Photoresponsive Nanosheets of Polyoxometalates Formed by Controlled Self-Assembly Pathways, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 10.1002/anie.201612473, 56, 11, 2974-2978, 2017.03, Anionic Keggin polyoxometalates (POMs) and ether linkage‐enriched ammonium ions spontaneously self‐assemble into rectangular ultrathin nanosheets in aqueous media. The structural flexibility of the cation is essential to form oriented nanosheets; as demonstrated by single‐crystal X‐ray diffraction measurements. The difference in initial conditions exerts significant influence on selecting for self‐assembly pathways in the energy landscape. Photoillumination of the POM sheets in pure water causes dissolution of reduced POMs, which allowed site‐specific etching of nanosheets using laser scanning microscopy. By contrast, photoetching was suppressed in aqueous AgNO3 and site‐selective deposition of silver nanoparticles occurred as a consequence of electron transfer from the photoreduced POMs to Ag+ ions on the nanosheet surface.. |
| 98. |
Pengfei Duan, Deepak Asthana, Takuya Nakashima, Tsuyoshi Kawai, Nobuhiro Yanai, Nobuo Kimizuka, All-or-none switching of photon upconversion in self-assembled organogel systems, Faraday Discussions, 10.1039/c6fd00170j, 196, 305-316, 2017.01, Aggregation-induced photon upconversion (iPUC) based on a triplet-triplet annihilation (TTA) process is successfully developed via controlled self-assembly of donor-acceptor pairs in organogel nanoassemblies. Although segregation of donor from acceptor assemblies has been an outstanding problem in TTA-based UC and iPUC, we resolved this issue by modifying both the triplet donor and aggregation induced emission (AIE)-type acceptor with glutamate-based self-assembling moieties. These donors and acceptors co-assemble to form organogels without segregation. Interestingly, these donor-acceptor binary gels show upconversion at room temperature but the upconversion phenomena were lost upon dissolution of the gels on heating. The observed changes in TTA-UC emission were thermally reversible, reflecting the controlled assembly/disassembly of the binary molecular systems. The observed on/off ratio of UC emission was much higher than that of the aggregation-induced fluorescence of the acceptor, which highlights the important role of iPUC, i.e., multi-exciton TTA for photoluminescence switching. This work bridges iPUC and supramolecular chemistry and provides a new strategy for designing stimuli-responsive upconversion systems.. |
| 99. |
Teppei Yamada, K. Shiraishi, H. Kitagawa, Nobuo Kimizuka, Applicability of MIL-101(Fe) as a cathode of lithium ion batteries, Chemical Communications, 10.1039/c7cc01712j, 53, 58, 8215-8218, 2017, MIL-101(Fe) was investigated as a cathode material of lithium ion batteries. A battery test reveals that MIL-101(Fe) shows a charge and discharge capacitance of 110 mA h g-1. It also showed reversible charge and discharge cycles and uptake of 0.62 Li/Fe after 100 cycles, which is the highest loading amount ever reported for the carboxylic MOFs. It also operates in the temperature range up to 350 °C and showed a good high thermal stability.. |
| 100. |
Yoichi Sasaki, Shogo Amemori, Hironori Kouno, Nobuhiro Yanai, Nobuo Kimizuka, Near infrared-to-blue photon upconversion by exploiting direct S-T absorption of a molecular sensitizer, Journal of Materials Chemistry C, 10.1039/c7tc00827a, 5, 21, 5063-5067, 2017, Triplet-triplet annihilation-based photon upconversion (TTA-UC) from NIR to blue light remains a great challenge. Here, we employ a direct singlet-to-triplet (S-T) excitation to circumvent an energy loss associated with the intersystem crossing (ISC) of triplet sensitizers. The TTA-UC based on the S-T absorption (STUC) allowed an efficient NIR (λ = 724 nm)-to-blue (λ = 462 nm) upconversion with a large anti-Stokes shift of 0.97 eV.. |
| 101. |
Kazuma Mase, Keisuke Okumura, Nobuhiro Yanai, Nobuo Kimizuka, Triplet sensitization by perovskite nanocrystals for photon upconversion, Chemical Communications, 10.1039/c7cc03087h, 53, 59, 8261-8264, 2017, The potential of three-dimensional (3D) metal-halide perovskites to sensitize organic triplets is unveiled. Nanocrystals of surface-modified inorganic cesium lead halide perovskites (CsPbX3, X = Br/I) are found to work as efficient triplet sensitizers for photon upconversion based on triplet-triplet annihilation (TTA-UC) at low excitation intensity.. |
| 102. |
Teppei Yamada, Yuta Kubo, Nobuo Kimizuka, Introduction of Thiourea into Metal-Organic Frameworks by Immersion Technique and Their Phase Transition Characteristics, 10.1246/cl.160910, 46, 115-117, 2016.11. |
| 103. |
Nobuo Kimizuka, Nobuhiro Yanai, Masa-aki Morikawa, Photon Upconversion and Molecular Solar Energy Storage by Maximizing the Potential of Molecular Self-Assembly, LANGMUIR, 10.1021/acs.langmuir.6b03363, 32, 47, 12304-12322, 2016.11. |
| 104. |
Kazunori Matsuura, Yusaku Mizuguchi, Nobuo Kimizuka, Peptide nanospheres self-assembled from a modified β-annulus peptide of Sesbania mosaic virus, Biopolymers, 10.1002/bip.22774, 470-475, 2016.11, A novel β-annulus peptide of Sesbania mosaic virus bearing an FKFE sequence at the C terminus was synthesized, and its self-assembling behavior in water was investigated. Dynamic light scattering and transmission electron microscopy showed that the β-annulus peptide bearing an FKFE sequence self-assembled into approximately 30 nm nanospheres in water at pH 3.8, whereas the β-annulus peptide without the FKFE sequence afforded only irregular aggregates. The peptide nanospheres possessed a definite critical aggregation concentration (CAC = 26 μM), above which the size of nanospheres were nearly unaffected by the peptide concentration. The formation of peptide nanospheres was significantly affected by pH; the peptide did not form any assemblies at pH 2.2, whereas larger aggregates were formed at pH 6.4–11.6.. |
| 105. |
Jing Liu, Masa-aki Morikawa, Hairui Lei, Keita Ishiba, Nobuo Kimizuka, Hierarchical Self-Assembly of Luminescent Tartrate-Bridged Chiral Binuclear Tb(III) Complexes in Ethanol, CHEMISTRY-A EUROPEAN JOURNAL, 10.1021/acs.langmuir.6b02254, 32, 41, 10597-10603, 2016.10. |
| 106. |
JOSEPH KA HO HUI, Hiroyuki Kishida, Keita Ishiba, Kenta Takemasu, Masa-aki Morikawa, Nobuo Kimizuka, Ferroelectric Coordination Polymers Self-Assembled from Mesogenic Zinc(II) Porphyrin and Dipolar Bridging Ligands, CHEMISTRY-A EUROPEAN JOURNAL, 10.1002/chem.201602175, 22, 40, 14213-14218, 2016.09. |
| 107. |
Nobuo Kimizuka, Zhou Hongyao, Teppei Yamada, Supramolecular Thermo-Electrochemical Cells: Enhanced Thermoelectric Performance by Host-Guest Complexation and Salt-Induced Crystallization, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 10.1021/jacs.6b04923, 138, 33, 10502-10507, 2016.08. |
| 108. |
Shogo Amemori, Youichi Sasaki, Nobuhiro Yanai, Nobuhiro Yanai, Near-Infrared-to-Visible Photon Upconversion Sensitized by a Metal Complex with Spin-Forbidden yet Strong S-0-T-1 Absorption, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 10.1021/jacs.6b04692, 138, 28, 8702-8705, 2016.07. |
| 109. |
Hironori Kono, Taku Ogawa, Shogo Amemori, Nobuhiro Yanai, Nobuo Kimizuka, Tripret Energy migration-based photon upconversion by amphiphilic molecular assemblies in aerated water, 7, 5224-5229, 2016.05. |
| 110. |
Nobuo Kimizuka, Keisuke Okumura, Kazuma Mase, Nobuhiro Yanai, Employing Core-Shell Quantum Dots as Triplet Sensitizer for Photon Upconversion, Chem.-Eur. J., 10.1002/chem.20160998, 2016.04. |
| 111. |
Masanori Hosoyamada, Nobuhiro Yanai, Taku Ogawa, Nobuo Kimizuka, Molecularly Dispersed Donors in Acceptor Molecular Crystals for Photon Upconversion under Low Excitation Intensity, CHEMISTRY-A EUROPEAN JOURNAL, 10.1002/chem.201503318, 22, 6, 2060-2067, 2016.02. |
| 112. |
Masaaki Abe, Hiroki Futagwa, Toshikazu Ono, Teppei Yamada, Nobuo Kimizuka, Yoshio Hisaeda, An Electropolymerized Crystalline Film Incorporating Axially-Bound Metalloporphycenes: Remarkable Reversibility, Reproducibility, and Coloration Efficiency of Ruthenium(II/III)-Based Electrochromism, INORGANIC CHEMISTRY, 10.1021/acs.inorgchem.5b02129, 54, 23, 11061-11063, 2015.12. |
| 113. |
久光 翔太, 楊井 伸浩, Nobuo Kimizuka, Photon-Upconverting Ionic Liquids: Effective Triplet Energy Migration in Contiguous Ionic Chromophore Arrays, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 10.1002/anie.201505168, 54, 39, 11550-11554, 2015.09, フォトン・アップコンバージョン機能を有するイオン液体を世界で初めて開発した。従来のアップコンバージョン技術が抱えていた①空気中（酸素の存在下）で機能しない，②揮発性の有機溶媒を用いる，③短い励起寿命の間に２つの励起分子が拡散衝突する必要がある などの問題を一挙に解決するものであり、イオン液体分野に新しい研究分野を開拓した。. |
| 114. |
Shota Hisamitsu, 楊井 伸浩, Shigenori Fujikawa, Nobuo Kimizuka, Photoinduced Crystallization in Ionic Liquids: Photodimerization-induced Equilibrium Shift and Crystal Patterning, CHEMISTRY LETTERS, 10.1246/cl.150261, 44, 7, 908-910, 2015.07. |
| 115. |
Nobuo Kimizuka, 小川 卓, 楊井 伸浩, Monguzzi, Angelo, Highly Efficient Photon Upconversion in Self-Assembled Light-Harvesting Molecular Systems, SCIENTIFIC REPORTS, 10.1038/srep10882, 5, 2045-2322, 2015.06, フォトン・アップコンバージョンは、これまで利用できなかった弱いエネルギーの光を利用可能にする技術であり、太陽電池や人工光合成の効率を飛躍的に向上するなどの、再生可能エネルギー技術への応用が期待される。本研究では、太陽光などの弱い光でも機能し、高効率で、かつ空気中で安定なフォトン・アップコンバージョンを示す分子組織体を世界で初めて開発した。. |
| 116. |
Nobuo Kimizuka, DUAN PENGFEI, Nobuhiro Yanai, Yuki Kurashige, Aggregation-Induced Photon Upconversion through Control of the Triplet Energy Landscapes of the Solution and Solid States, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 10.1002/anie.201501449, 54, 26, 7544-7549, 2015.06. |
| 117. |
Nobuo Kimizuka, 小河 重三郎, Masa-aki Morikawa, JUHASZ GERGELY MIKLOS, Interlocked Dimerization of C3-Symmetrical Boron Difluoride Complex: Designing Non-Cooperative Supramolecular Materials for Luminescent Thin Films, RSC Adv., 2015,5, 60373-60379, 10.1039/C5RA11908A, 60373-60379, 2015.05. |
| 118. |
Nobuo Kimizuka, DUAN PENGFEI, 楊井 伸浩, Hisanori Nagatomi, Photon Upconversion in Supramolecular Gel Matrixes: Spontaneous Accumulation of Light-Harvesting Donor-Acceptor Arrays in Nanofibers and Acquired Air Stability, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 10.1021/ja511061h, 137, 5, 1887-1894, 2015.02. |
| 119. |
Nobuo Kimizuka, Masa-aki Morikawa, Keita Ishiba, Teppei Yamada, Chie Chikara, Katsunori Iwase, Mika Kawakita, Photoliquefiable Ionic Crystals: A Phase Crossover Approach for Photon Energy Storage Materials with Functional Multiplicity, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 10.1002/anie.201410184, 54, 5, 1532-1536, 2015.01, Ionic crystals (ICs) of the azobenzene derivatives show photoinduced IC-ionic liquid (IL) phase transition (photoliquefaction) upon UV-irradiation, and the resulting cis-azobenzene ILs are reversibly photocrystallized by illumination with visible light. The photoliquefaction of ICs is accompanied by a significant increase in ionic conductivity at ambient temperature. The photoliquefaction also brings the azobenzene ICs further significance as photon energy storage materials. The cis-IL shows thermally induced crystallization to the trans-IC phase. This transition is accompanied by exothermic peaks with a total Delta H of 97.1 kJmol(-1), which is almost double the conformational energy stored in cis-azobenzene chromophores. Thus, the integration of photoresponsive ILs and self-assembly pushes the limit of solar thermal batteries.. |
| 120. |
Tetsuro Soejima, Yuta Amako, Seishiro Ito, Nobuo Kimizuka, Light-Reducible Dissipative Nanostructures Formed at the Solid-Liquid Interface, LANGMUIR, 10.1021/la5036568, 30, 47, 14219-14225, 2014.12. |
| 121. |
Kouta Masutani, Masa-aki Morikawa, Nobuo Kimizuka, A liquid azobenzene derivative as a solvent-free solar thermal fuel, Chem. Commun., 10.1039/c4cc07713j, 50, 15803-15806, 2014.11, A liquid solar thermal fuel is developed; a low-molecular weight liquid trans-azobenzene derivative shows facile photoisomerization to the higher-energy cis-isomer in neat condition so that a high volumetric energy density is achieved. Shear viscosity measurements for each isomer liquid unveiled transitions from non-Newtonian to Newtonian fluids.. |
| 122. |
DUAN PENGFEI, 楊井 伸浩, Nobuo Kimizuka, A Bis-Cyclometalated Iridium Complex as a Benchmark Sensitizer for Efficient Visible-to-UV Photon Upconversion, Chem. Commun., 10.1039/c4cc05718j, 50, 13111-13113, 2014.10, To resolve the biggest problemin visible-to-UV photon upconversion based on sensitized triplet-triplet annihilation-the quenching of upconverted fluorescence by sensitizers-we discovered a superior sensitizer with less UV absorption intensity that enables highly efficient, low-power (0.78 mW cm(-2)) visible-to-UV upconversion.. |
| 123. |
Ryota Tanoue, Higuchi Rintaro, Kiryu Ikebe, Shinobu Uemura, Nobuo Kimizuka, Stieg, Adam Z, Gimzewski, James K, Masashi Kunitake, Positional selectivity of reversible azomethine condensation reactions at solid/liquid interfaces leading to supramolecule formation, JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 10.1016/j.jelechem.2013.11.022, 716, 145-149, 2014.03. |
| 124. |
Ryota Tanoue,, Rintaro Higuchi, Kiryu Ikebe, Shinobu Uemura, Nobuo Kimizuka, Stieg, Adam Z., Gimzewski, James K., Masashi Kunitake, Thermodynamic Self-Assembly of Two-Dimensional pi-Conjugated Metal-Porphyrin Covalent Organic Frameworks by "On-Site" Equilibrium Polymerization, JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 10.1166/jnn.2014.8540, 14, 3, 2211-2216, 2014.03. |
| 125. |
Kang, Tejwant Singh, Keita Ishiba, Masa-aki Morikawa, Nobuo Kimizuka, Self-Assembly of Azobenzene Bilayer Membranes in Binary Ionic Liquid-Water Nanostructured Media, LANGMUIR, 10.1021/la405010f, 30, 9, 2376-2384, 2014.03, Anionic azobenzene-containing amphiphile 1 (sodium 4-[4-(N-methyl-N-dodecylamino)phenylazo]-benzenesulfonate) forms ordered bilayer membranes in binary ionic liquid (1-ethyl-3-methylimidazolium ethyl sulfate, [C(2)mim][C2OSO3])-water mixtures. The binary [C(2)mim]-[C2OSO3]-water mixture is macroscopically homogeneous at any mixing ratio; however, it possesses fluctuating nanodomains of [C(2)mim]-[C2OSO3] molecules as observed by dynamic light scattering (DLS). These nanodomains show reversible heat-induced mixing behavior with water. Although the amphiphile 1 is substantially insoluble in pure water, it is dispersible in the [C(2)mim][C2OSO3] water mixtures. The concentration of [C(2)mim][C2OSO3] and temperature exert significant influences on the self-assembling characteristics of 1 in the binary media, as shown by DLS, transmission electron microscopy (TEM), UV vis spectroscopy, and zeta-potential measurements. Bilayer membranes with rodor dotlike nanostructures were formed at a lower content of [C(2)mim][C2OSO3] (2-30 v/v %), in which azobenzene chromophores adopt parallel molecular orientation regardless of temperature. In contrast, when the content of [C(2)mim][C2OSO3] is increased above 60 v/v %, azobenzene bilayers showed thermally reversible gel-to-liquid crystalline phase transition. The self-assembly of azoberizene amphiphiles is tunable depending on the volume fraction of [C(2)mim][C2OSO3] and temperature, which are associated with the solvation by nanoclusters in the binary [C(2)mim][C2OSO3] water media. These observations clearly indicate that mixtures of water-soluble ionic liquids and water provide unique and valiant environments for ordered molecular self-assembly.. |
| 126. |
野口 誉夫, 君塚 信夫, Spectroscopic readout of polyoxometalates' molecular information via self-assembly, CHEMICAL COMMUNICATIONS, 10.1039/c3cc47300g, 50, 5, 599-601, 2014.01. |
| 127. |
DUAN PENGFEI, 楊井 伸浩, 君塚 信夫, Photon Upconverting Liquids: Matrix-Free Molecular Upconversion Systems Functioning in Air, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 10.1021/ja411316s, 135, 51, 19056-19059, 2013.12. |
| 128. |
Masa-aki Morikawa, Nii Risa, Nobuo Kimizuka, Redox-active Microcapsules of Cytochrome c Formed at the Ionic Liquid-Water Interface, CHEMISTRY LETTERS, 10.1246/cl.130249, 42, 8, 788-790, 2013.08. |
| 129. |
Atsuomi Shundo, 堀 耕一郎, Nobuo Kimizuka, Keiji Tanaka, Design of a Dynamic Polymer Interface for Chiral Discrimination, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 10.1021/ja404701s, 135, 28, 10282-10285, 2013.07. |
| 130. |
Masa-aki Morikawa, Nobuo Kimizuka, Ken Murata, Kazuo Yamada, Controlled Formation of Microspheres from Ferrocene-derivatized Amino Acids in Binary Aqueous/Organic Media, CHEMISTRY LETTERS, 10.1246/cl.130050, 42, 5, 501-503, 2013.05. |
| 131. |
Kazunori Matsuura, Nobuo Kimizuka, Kenta Watanabe, Yoshihiro Matsushita, Guest-binding behavior of peptide nanocapsules self-assembled from viral peptide fragments, POLYMER JOURNAL, 10.1038/pj.2012.235, 45, 5, 529-534, 2013.05. |
| 132. |
Keita Kuroiwa, Nobuo Kimizuka, Self-assembly and functionalization of lipophilic metal-triazole complexes in various media, POLYMER JOURNAL, 10.1038/pj.2012.142, 45, 4, 384-390, 2013.04. |
| 133. |
Nobuo Kimizuka, Masa-aki Morikawa, Aki Takano, Syuichi Tao, Biopolymer-Encapsulated Protein Microcapsules Spontaneously Formed at the Ionic Liquid-Water Interface, BIOMACROMOLECULES, 10.1021/bm301371t, 13, 12, 4075-4080, 2012.12, Aqueous microdroplets introduced in ionic liquids (ILs) provide unique interfaces where surface-modified protein microcapsules are spontaneously formed at systemic temperature. The susceptibility of proteins to form microcapsules at the water-IL microinterface depends on protein species and is related to the number of charged residues exhibited on protein surfaces. When both of the capsule-forming (host) proteins and guests biopolymers such as nucleic acids or enzymes are introduced in the aqueous microdroplets, microcapsules are formed selectively from host proteins while the guest biopolymers remain encapsulated in the aqueous pool. Microcapsules formed in the IL phase are facilely extracted to aqueous phase after consecutive cross-linking and surface modification reactions, and the whole processes can be done in one pot. Enzymes confined in the inner water phase of aqueous protein microcapsules showed innate activity, as visualized by site-specific fluorescence detection using confocal laser scanning microscopy (CLSM). The present IL-water interfacial synthesis of protein microcapsules eliminates the use of volatile organic solvents or solid colloid templates, which creates a much-coveted solution to existing technologies.. |
| 134. |
Nobuo Kimizuka, Singh, Tejwant, Bharmoria, Pankaj, Masa-aki Morikawa, Kumar, Arvind, Ionic Liquids Induced Structural Changes of Bovine Serum Albumin in Aqueous Media: A Detailed Physicochemical and Spectroscopic Study, JOURNAL OF PHYSICAL CHEMISTRY B, 10.1021/jp303609h, 116, 39, 11924-11935, 2012.10. |
| 135. |
Nobuo Kimizuka, Tanoue, Ryota, Higuchi, Rintaro, Ikebe, Kiryu, Uemura, Shinobu, Stieg, Adam Z, Gimzewski, James K, Kunitake, Masashi, In Situ STM Investigation of Aromatic Poly(azomethine) Arrays Constructed by "On-Site" Equilibrium Polymerization, LANGMUIR, 10.1021/la302863h, 28, 39, 13844-13851, 2012.10. |
| 136. |
Masa-aki Morikawa, Nobuo Kimizuka, Converting Molecular Information of Redox Coenzymes via Self-Assembly, Chem. Commun., 48, 90, 11106-11108, 2012.09. |
| 137. |
Nobuo Kimizuka, K.Sakata, S.Yoshimoto, R.Kuwahara, K.Kuroiwa, M.Kunitake, Electrochemically Controlled 2D Assembly of Paddle-Wheel Diruthenium Complexes on the Au(111) Surface and Identification of Their Redox States, J. Phys. Chem. C, 10.1021/jp305951d, 116, 33, 17729-17733, (2012), 2012.08. |
| 138. |
T. Nakashima, N. Kimizuka, , Controlled self-assembly of amphiphiles in ionic liquids and the formation of ionogels by molecular tuning of cohesive energies published on the Web (2012). , Polymer J. , 10.1038/pj.2012.73, 44, (2012), 2012.04, In this paper, the self-assembling characteristics of a series of L-glutamate-based ammonium amphiphiles are studied in ionic liquids (ILs). These cationic amphiphiles are dispersible in imidazolium ILs with bis((trifluoromethyl)sulfonyl)amide (TFSA) anion. Amphiphiles-containing didodecyl ester or short dioctyl amide groups were molecularly dispersed in conventional 1-butyl-3-methylimidazolium TFSA, whereas they formed bilayer membranes when they were dispersed in polar, ether linkage-introduced IL. Thus, the modification of ILs exerts a crucial influence on amphiphilic self-assembly. Enhancement of the intermolecular interactions of L-glutamate amphiphiles is achieved by introducing multiple amide bonds and longer alkyl chains, which leads to better self-assembling properties. These amide-enriched amphiphiles form fibrous bilayer assemblies even in conventional ILs with low cohesive energy densities. These observations confirm that the formation of bilayer membranes in ILs is a general phenomenon when the solute molecules have the appropriate ‘ionophilic/ionophobic’ nature.. |
| 139. |
T. Soejima, R-H. Jin, Y. Terayama, A. Takahara, T. Shiraishi, S. Ito, N. Kimizuka,, Synthesis of TiO2 Nanocoral Structures in Ever-Changing Aqueous Reaction Systems , Langmuir,, 10.1021/la203943j, 28, 5, 2637-2642, 2012.01. |
| 140. |
R. Kuwahara, S. Fujikawa, K. Kuroiwa, N. Kimizuka,, Controlled Polymerization and Self-Assembly of Halogen-Bridged Diruthenium Complexes in Organic Media and Their Dielectrophoretic Alignment
, J. Am. Chem. Soc, 10.1021/ja208958t, 134, 1192-1199 , 2012, 2012.01, Lipophilic paddlewheel biruthenium complexes [Ru2(μ-O2CR)3X]n (O2CR = 3,4,5-tridodecyloxybenzoate, X = Cl, I) self-assemble in organic media to form halogen-bridged coordination polymers. The polymerization is accompanied by spectral changes in π(RuO,Ru2) → π*(Ru2) and π(axial ligand) → π*(Ru2) absorption bands. These polymeric complexes form lyotropic liquid crystals in n-decane at concentrations above 100 unit mM. The bridging halogen axial ligands (X = Cl or I) exert significant influences on their electronic structures and self-assembling characteristics: the chloride-bridged polymers give hexagonally aligned ordered columnar structure (columnar hexagonal phase, Colh), whereas the iodide-bridged polymers form less ordered columnar nematic (Coln) phase, as revealed by small-angle X-ray diffraction measurements. Chloro-bridged coordination polymers dispersed in n-decane are thermally intact even at the elevated temperature of 70 °C. In contrast, iodo-bridged polymers show reversible dissociation and reassembly phenomena depending on temperature. These halogen-bridged coordination polymers show unidirectional alignment upon applying alternating current (ac) electric field as investigated by crossed polarizing optical microscopy and scanning electron microscopy. The unidirectionally oriented columns of chloro-bridged polymers are accumulated upon repetitive application of the ac voltage, whereas iodo-bridged coordination polymers show faster and reversible alignment changes in response to turning on-and-off the electric field. The controlled self-assembly of electronically conjugated linear complexes provide a potential platform to design electric field-responsive nanomaterials.. |
| 141. |
K. Kuroiwa, M. Yoshida, S. Masaoka, K. Kaneko, K. Sakai, N. Kimizuka, Self-Assembly of Tubular Microstructures from Mixed-Valence Metal Complexes and Their Reversible Transformation by External Stimuli, Angew. Chem. Int. Ed., 10.1002/anie.201105080, 51, 656-659, (2012), 2012.01, Mix and shake: Lipid packaged dinuclear ruthenium(II,III) complexes of class III mixed-valence state produce a reversible hypochromic effect upon external physical stimuli, such as shaking, due to the arrangement of transition dipole moments. The effect is accompanied by tubular-to-ribbon structural changes (see scheme).. |
| 142. |
R. Higuchi, R. Tanoue, N. Enoki, Y. Miyasato, K. Sakaguchi, S. Uemura, N. Kimizuka, M. Kunitake, , Chemical Liquid Deposition of Aromatic Poly(azomethine)s by Spontaneous On-Site Polycondensation in Aqueous Solution, Chem. Commun., 10.1039/C2CC16975D, 48, 3103-3105, (2012), 2012.01, Colored Schiff-base p-conjugated polymer thin films from different
combinations of aromatic amines and aldehydes have been prepared.
The polymer films spontaneously form under ambient conditions by
simple immersion of graphite substrates in an aqueous solution
containing the monomer units. Chemical liquid deposition is
achieved by delicate control of solution pH, which allows surface
selective polymerization and deposition but inhibits reaction in the
aqueous phase.. |
| 143. |
J. Liu, M-A. Morikawa, N. Kimizuka, , Conversion of Molecular Information by Luminescent Nanointerface Self-Assembled from Amphiphilic Tb(III) Complexes, J. Am. Chem. Soc, 10.1021/ja2057924, 133, 43, 17370-17374, 2011, 2011.09, A novel amphiphilic Tb3+ complex (TbL+) having anionic bis(pyridine) arms and a hydrophobic alkyl chain is developed. It spontaneously self-assembles in water and gives stable vesicles that show sensitized luminescence of Tb3+ ions at neutral pH. This TbL+ complex is designed to show coordinative unsaturation, i.e., water molecules occupy some of the first coordination spheres and are replaceable upon binding of phosphate ions. These features render TbL+ self-assembling receptor molecules which show increase in the luminescence intensity upon binding of nucleotides. Upon addition of adenosine triphosphate (ATP), significant amplification of luminescent intensity was observed. On the other hand, ADP showed moderately increased luminescence and almost no enhancement was observed for AMP. Very interestingly, the increase in luminescence intensity observed for ATP and ADP showed sigmoidal dependence on the concentration of added nucleotides. It indicates positive cooperative binding of these nucleotides to TbL+ complexes preorganized on the vesicle surface. Self-assembly of amphiphilic Tb3+ receptor complexes provides nanointerfaces which selectively convert and amplify molecular information of high energy phosphates linked by phosphoanhydride bonds into luminescence intensity changes.. |
| 144. |
K. Matsuura, K. Murasato, N. Kimizuka, Syntheses and Self-assembling Behaviors of Pentagonal Conjugates of Tryptophane Zipper-Forming Peptide, Int. J. Mol. Sci., 12, 5187-5199 , 2011, 2011.07. |
| 145. |
M. Toganoh, T. Takayama, N. Ritesh, N. Kimizuka, H. Furuta, Synthesis and Properties of Acetylene-Bridged N-Confused Porphyrin Dimers , Chem. Lett., 40, 1021-1023, 2011, 2011.06. |
| 146. |
K. Matsuura, K. Tochio, K. Watanabe, N. Kimizuka,, Controlled Release of Guest Molecules from Spherical Assembly of Trigonal Gultathione by Disulfide Recombination , Chem. Lett., 40, 711-713, 2011, 2011.06. |
| 147. |
T. Noguchi,C. Chikara , K. Kuroiwa, K. Kaneko, N. Kimizuka, Controlled Morphology and Photoreduction Characteristics of Polyoxometalate(POM)/Lipid Complexes and the Effect of Hydrogen Bonding at Molecular Interfaces, Chem. Commun.,, 10.1039/C1CC10231A, 47 , 6455-6457 , 2011, 2011.04, Supramolecular complexes consisting of anionic polyoxometalate
(POM) and chiral, cationic lipids are newly developed. They give
nanofibers, helical ribbons, and nanotapes in organic media
depending on the chemical structure of lipid molecules. Lipid
ammonium groups exert significant influence on their photoreduction characteristics.. |
| 148. |
Masa-aki MORIKAWA, Kwonil KIM, Hiroshi KINOSHITA, Kei YASUI, Yoshinori KASAI and Nobuo KIMIZUKA, Aqueous Nanospheres Self-Assembled from Hyperbranched Polymers and Silver Ions: Molecular Inclusion and Photoreduction Characteristics., Macromolecules, , 43, 2, 8971-8976, 2010.11. |
| 149. |
Kazunori Matsuura, Kenta Watanabe, Tsubasa Matsuzaki, Kazuo Sakurai, Nobuo Kimizuka, Self-Assembled Synthetic Viral Capsids from a 24-mer Viral Peptide Fragment, Angew. Chem. Int. Ed., 10.1002/anie.201004606, 49, 50, 9662-9665, 2010.11. |
| 150. |
Ryuhei Nishiyabu, Carole Aime´ , Ryosuke Gondo, Kenji Kaneko, and Nobuo Kimizuka, Selective inclusion of anionic quantum dots in coordination network shells of nucleotides and lanthanide ions, Chem. Commun., , 10.1039/c001012j, 46, 4333 - 4335, 2010.10, Anionic quantum dots (QDs) are spontaneously enfolded by
coordination networks self-assembled from nucleotide monophosphates
and lanthanide ions in water; luminescent core–shell
nanoparticles are specifically obtained for anionic QDs, which
allows their separation from amine-modified QDs.. |
| 151. |
Kazunori Matsuura, Hiroki Hayashi, Kazuya Murasato, Nobuo Kimizuka, Trigonal tryptophane zipper as a novel building block for pH-responsive peptide nano-assemblies, Chem. Commun.,, 10.1039/C0CC01324B, 47, 265-267, 2010.06. |
| 152. |
Rempei Kuwahara, Keita Kuroiwa and Nobuo Kimizuka, Synthesis of Lipophilic Gold Nanosheets by Using Reducing Stabilizers and Their Reversible Transformation between Golden Solid, Chem. Lett., 2010, 39, 226-227, No.39,, 226-227, 2010.02. |
| 153. |
Carole Aime´ , Ryuhei Nishiyabu, Ryosuke Gondo, and Nobuo Kimizuka, Switcing On Luminescence in Nucleotide/Lanthanide Coordination Nanoparticles via Synergistic Interactions with a Cofactor Ligand, Chem.Eur.J.,, 10.1002/chem.201000007, No.16,, 3604-3607, 2010.02. |
| 154. |
Hisashi Shimakoshi, Makoto Abiru, Keita Kuroiwa, Nobuo Kimizuka, Midori Watanabe, and Yoshio Hisaeda, Preparation and Reactivity of Vitamin B12-TiO2 Hybrid Catalyst Immobilized on a Glass Plate, Bull.Chem.Soc.Jpn., , 83, No.2,, 170-172, 2010.02. |
| 155. |
Keita Kuroiwa, Nobuo Kimizuka, Electrochemically Controlled Self-assembly of Lipophilic FeII 1,2,4-Triazole Complexes in Chloroform, Chem. Lett., 2010, No.39,, 790-791, 2010.02. |
| 156. |
Ryuhei Nishiyabu,Carole Aime,Ryosuke Gondo,Takao Noguchi,Nobuo Kimizuka, Confining molecules within aqueous coordination nanoparticles by adaptive molecular self-assembly , Angew. chem. Int. ED, , 10.1002/anie.200904124, 9, No.50,, 9465-9468, 2009.11. |
| 157. |
Keita Kuroiwa,Hirotsugu Kikuchi, Nobuo Kimizuka, Spin crossover characteristics of nanofibrous FeⅡ-1,2,4-triazole complexes in liquid crystals, ChemCommun, , 10.1039/B920631k, 10, No.46,, 1229-1231 , 2009.11. |
| 158. |
Tetsuro Soejima, Masa-aki Morikawa, Nobuo Kimizuka, Holey Gold Nanowires Formed by Photoconversion of Dissipative Nanostructures Emerged at the Aqueous-Organic Interface, small, 10.1002/smll.200900348, 5, , No.18,, 2043-2047 , 2009.07. |
| 159. |
Tetsuro Soejima,, Nobuo Kimizuka, One-Pot Room-Temperature Synthesis of Single-Crystalline Gold Nanocorolla in Water, J. Am. Chem. Soc, 5, , No.18,, 2043-2047 , 2009.07. |
| 160. |
Tetsuro Soejima, Toshio Hasegawa,Masa-aki Morikawa, Nobuo Kimizuka, Photoinduced Outgrowth of Gold Nanotadpoles in Aqueous Bilayer Dispersions, chem. lett., 10.1246/cl.2009.688, 38, 7, 688-689 , 2009.04. |
| 161. |
Kazunori Matsuura, Kouzou Masumoto, Yuuko Igami, Kwonil Kim and Nobuo Kimizuka, CTAB-induced Morphological Transition of DNA Micro-Assembly from Filled Spheres to Hollow Capsule, Mol. BioSyst.,, 10.1039/b903382c, 5, 921 - 923, 2009.04. |
| 162. |
Kazunori Matsuura, Hironori Matsuyama, Takashi Fukuda, Takeshi Teramoto, Kenta Watanabe, Kazuya Murasato and Nobuo Kimizuka, Spontaneous Self-assembly of Nano-spheres from Trigonal Conjugate of Glutathione in Water, Soft Matter, 10.1039/b819472f, 5, 2463-2470, 2009.03. |
| 163. |
Kazuki Yamada, Yuki Okazaki, Tomohiko Inomata, Keita Kuroiwa, Nobuo Kimizuka, Tomohiro Ozawa,Yasuhiro Funahashi, and Hideki Masuda , Nano-Film Structures Constructed by Self-Assembly of Co(III) Biuretato Complexes and Long Alkyl Imidazolium Cations, J. Nanosci. Nanotechnol., 9, pp307–312 , 2009.02. |
| 164. |
Nishiyabu, Ryuhei; Hashimoto, Nozomi; Cho, Ten; Watanabe, Kazuto; Yasunaga, Takefumi; Endo, Ayataka;
Kaneko, Kenji; Niidome, Takuro; Murata, Masaharu; Adachi, Chihaya; Katayama, Yoshiki; Hashizume, Makoto; Kimizuka, Nobuo
, Nanoparticles of Adaptive Supramolecular Networks Self-Assembled from Nucleotides and Lanthanide Ions, Journal of the American Chemical Society, No131,No.6 ,pp2151-2158, 2009.01. |
| 165. |
Carole Aime,Ryuhei Nishiyabu,Ryosuke Gondo,Kenji Kaneko,and Nobuo Kimizuka, Controlled self-assembly of nucleotide-lanthanide complexes:specific formation of nanofibers from dimeric guanine nucleotides, Chemical Communications, 2008.09. |
| 166. |
Hiroyuki Matsukizono,Keita Kuroiwa,and Nobuo Kimizuka
, Lipid-Packaged Linear Iron（Ⅱ）Triazole Complexes in Solution : Controlled Spin Conversion via Solvophobic Self-Assembly
, Journal of the American Chemical Society, Vol.8,No130 ,pp5622, 2008.06. |
| 167. |
Hiroyuki Matsukizono, Keita Kuroiwa, and Nobuo Kimizuka
, Self-assembly-directed Spin Conversion of Iron(II) 1,2,4-Triazole Complexes in Solution and Their Effect on Photorelaxation Processes of Fluorescent Counter Ions
, Chemistry Letters
, Vol.8.No37.ｐｐ446, 2008.05. |
| 168. |
Tomohiro Shiraki, Masa-aki Morikawa, and Nobuo Kimizuka
, Morphological Transformation of Ultrathin Gold Nanosheets to Rounded Nanotapes in the Photomediated Reduction Process
, Chemistry Letters
, Vol.8.No37.ｐｐ352, 2008.04. |
| 169. |
Keita Kuroiwa and Nobuo Kimizuka
, Coordination Structure Changes of Linear Cobalt(II) Triazole Complexes Induced by Binding of Long-chained Alcohols: Adaptive Molecular Clefts
, Chemistry Letters
, Vol.8.No37.ｐｐ192, 2008.03. |
| 170. |
Kazuya Murasato, Kazunori Matsuura, and Nobuo Kimizuka
, Self-Assembly of Nanofiber with Uniform Width from Wheel-Type Trigonal- -Sheet-Forming Peptide
, Biomacromolecules
, Vol.8.No9.ｐｐ913, 2008.02. |
| 171. |
Tomohiro Shiraki, Masa-aki Morikawa, and Nobuo Kimizuka
, Amplification of Molecular Information through Self-Assembly:Nanofibers Formed from Amino Acids and Cyanine Dyes by Extended Molecular Pairing**
, Angew.Chem.Int.Ed_08_47_106
, 2008.01. |
| 172. |
Kazunori Matsuura, kouzo Masumoto, Yuuko Igami, Tetsuro Fujioka, and Nobuo Kimizuka, In Situ Observation of Spherical DNA Assembly inWater and the Controlled Release of Bound Dyes, BioMACROMOLECULES , Vol.8,No9,pp2726-2732, 2007.09. |
| 173. |
Kwonil Kim,Kazunori Matsuura and Nobuo Kimizuka, Binding of lectin to DNA micro-assemblies:Modification of nucleo-cages with lactose-conjugated psoralen, Bioorganic&Medical Chemistry , Vol.15 pp4311-4317, 2007.06. |
| 174. |
Hironobu. TAKAHASHI, Yasuro. NIIDOME, Hideyuki. HISANABE, Keita. KUROIWA, Nobuo. KIMIZUKA and Sunao. YAMADA, Spatio-selective Surface Modification of Glass Assisted by Laser-induced Deposition
of Gold Nanoparticle
, Thin Solid Films, 515、pp.1618-1622
, 2006.12. |
| 175. |
Keita KUROIWA, Noriko ODA and Nobuo KIMIZUKA, Supramolecular Solvatochromism. Effect of Solvents on the Self-Assembly and Charge Transfer Absorption Characteristics of Lipid-Packaged, Linear Mixed Valence Platinum Complexes, Science and Technology of Advanced Materials, 7,pp629-634, 2006.10. |
| 176. |
Keita,Kuroiwa,Tomoko,Shibata,Sono,Sasaki,Masaaki,Ohba,Atsushi,Takahara,Toyoki,Kunitake,Nobuo,Kimizuka, Supermolecular Control of Spin Crossover Phenomena in Lipophilic Fe(Ⅱ）1,2,4-Triazole Complexes., Jounal of Polymer Science PartA, pp.5192-5202, 2006.07. |
| 177. |
Shoko,Kume,Keita,Kuroiwa,Nobuo,Kimizuka, Photo-Responsive Molecular Wires of Fe(Ⅱ）Triazole Complexes in Organic Medeia and Light-induced Morephological Transformations, Chem.Commum, pp.2442-2444, 2006.04. |
| 178. |
Kwonil Kim,Keita Kuroiwa,Nobuo,Kimizuka, In Situ Observation of Spherical DNA Assembly "Nucleo-cages" in Water and Their Stabilization by Photo-Crosslinking, Chem.Lett., On Web, 2006.04. |
| 179. |
H.Takahashi,Y.Niidome,H,Hisanabe,K.Kuroiwa,N,Kimizuka,S,Yamada, Spatio-selective Surface Modification of Glass Assisted by Laser-induced Deposition of Gold Nanoparticle, Thin Solid Nanoparticle, in press, 2006.01. |
| 180. |
Keita,Kuroiwa,Noriko Oda,Nobuo,Kimizuka, Supermolecular solvatochromism.Effect of solvents on the self-asssembly and charge transfer absorption characteristics of lipid-packaged,linear mixed valence platinum complexes, Science and Technology of Advanced Materials, in press, 2006.01. |
| 181. |
88 Tetsu Yonezawa, Shin-ya Onoue, Nobuo Kimizuka, Adsorption-induced Self-fusion of Cationic Gold Nanopaticles on Tobacco Mosaic Virus (TMV), Chem. Lett., 34, No.11, 1498-1499, 2005.10. |
| 182. |
Masa-aki Morikawa, Nobuo Kimizuka, Spatially Controlled Self-Assembly of Gold Nanoparticles Encased in α–helical polypeptide nanospheres., Chem. Commun., 10.1039/b507818k, 38, 4866-4868, 2005, 4866-4868., 2005.09. |
| 183. |
Tetsuro Soejima, Nobuo Kimizuka, Ultrathin Gold Nanosheets Formed by Photoreduction at the Ionic Liquid/Water Interface, Chem. Lett., 10.1246/cl.2005.1234, 34, 9, 1234-1235, 34, No. 11, 1234-1235, 2005.08. |
| 184. |
Kazunori Matsuura, Kazuya Murasato, Nobuo Kimizuka, Artificial Peptide-Nanospheres Self-Assembled from Three-Way Junctions of beta-Sheet-Forming Peptides, J. Am. Chem. Soc., 10.1021/ja052644i, 127, 29, 10148-10149, 127, No. 29, 10148-10149., 2005.06. |
| 185. |
M. Isayama, K. Nomiyama, T. Yamaguchi, N. Kimizuka, Templated Synthesis of Mesoscopic Tube Silicates Using Aqueous Mixtures of Naphthalenediol and Ammonium Surfactants, Chem. Lett., 10.1246/cl.2005.462, 34, 4, 462-463, 34, No.4, 462-463, 2005.04. |
| 186. |
Kei Yasui, Nobuo Kimizuka, Enzymatic Synthesis of Gold Nanoparticles Wrapped by Glucose Oxidase, Chem. Lett., 10.1246/cl.2005.416, 34, 3, 416-417, 34, No. 3, 416-417, 2005.03. |
| 187. |
M.-A. Morikawa, M. Yoshihara, T. Endo and N. Kimizuka, ATP as Building Blocks for the Self-Assembly of Excitonic Nanowires, J. Am. Chem. Soc.,, 10.1021/ja043844h, 127, 5, 1358-1359, 127, No. 5, 1358 - 1359., 2005.02. |
| 188. |
Kei Yasui, Nobuo Kimizuka, Self-Assembled Nanowires of Lipid-Packaged Halogen-Bridged Platinum Complexes Formed by One-pot Oxidation of Pt(en)2 complexes by Au(III) ions, Chem. Lett., 10.1246/cl.2005.248, 34, 2, 248-249, 34, No. 2, 248-249, 2005.02. |
| 189. |
T,Nakashima,N.Kimizuka, Molecular Self-Assenbly in Ionic Liquids In Electrochemical Aspects of Ionic Liquids, Chapt.11,pp.143-156., 2005.01. |
| 190. |
M.-A.Morikawa,M,Yoshihara,T,EndoandN,Kimizuka, α-Herical Polypeputido Microcapsules Formed by Emulsion-Templated Self-Assembly, Chemistry-Europian Journal, 11,pp.1574-1578, 2005.01. |
| 191. |
K. Kuroiwa, T. Shibata, A. Takada, N. Nemoto, N. Kimizuka, Heat-Set Gel-like Networks of Linear Co(II) Triazole Complexes in Organic Media and their Thermochromic Structural Transitions, J. Am. Chem. Soc, 10.1021/ja037847q, 126, 7, 2016-2021, J. Am. Chem. Soc. 126, 2016-2021 (2004), 2004.02. |
| 192. |
H. Shimakoshi, M. Tokunaga, K. Kuroiwa, N. Kimizuka and Y. Hisaeda, Preparation and Electrochemical Behavior of Hydrophobic Vitamin B12 Covalently Immobilized onto Platinum Electrode, Chem. Commun, 10.1039/b309457j, 1, 50-51, No.1, 50-51 (2004), 2004.01. |
| 193. |
Nobuo Kimizuka, Self-Assembly in Mesoscopic Dimension and Artificial Supramolecular Membranes, Curr. Opin. Chem. Biol., 10.1016/j.cbpa.2003.10.010, 7, 6, 702-709, 7, 702-709 (2003), 2003.07. |
| 194. |
K. Matsuura, T. Yamashita, Y. Igami and N. Kimizuka, Nucleo-Nanocages: Designed Ternary Oligodeoxyribonucleotides Spontaneously Form Nanosized DNA Cages, Chem. Commun., 10.1039/b210139d, 3, 376-377, 376-377, 2003.01. |
| 195. |
K. Matsuura, K. Hayashi and N. Kimizuka, Lectin-Mediated Supramolecular Junctions of Galactose-Derivatized Single-Walled Carbon Nanotubes, Chem. Lett., 10.1246/cl.2003.212, 32, 3, 212-213, 32, 212-213, 2003.01. |
| 196. |
T. Yonezawa, H. Matsune and N. Kimizuka, Formation of Isolated Spherical Three-dimensional Nanoparticle Assembly as Stable
Submicron-sized Units by Using an Inorganic Wrapping Technique, Adv. Mater., 15, No.6, 499-503, 2003.01. |
| 197. |
N. Kimizuka, Y. Hatanaka and T. Kunitake, Supramolecular Assemblies Consisting of Naphthalene-containing Anionic Amphiphiles and One-dimensional Halogen-Bridged Platinum Complexes, Advanced Macromolecular and Supramolecular Materials and Processes, 109-114, 109-114, 2003.01. |
| 198. |
T. Nakashima and N. Kimizuka, Interfacial Synthesis of Hollow TiO2 Microspheres in Ionic Liquids, J. Am. Chem. Soc., 10.1021/ja034954b, 125, 21, 6386-6387, 125, No. 21, 6386-6387, 2003.01. |
| 199. |
T. Yonezawa, S. Onoue, N. Kimiuzka, Metal Coating of DNA Molecules by Cationic, Metastable Gold Nanoparticles, Chem. Lett., 10.1246/cl.2002.1172, 12, 1172-1173, No.12. 1172-1173, 2002.11. |
| 200. |
C.-S. Lee, N. Kimizuka, Solvatochromic Nanowires Self-assembled from Cationic, Chloro-bridged Linear Platinum Complexes and Anionic Amphiphiles, Chem. Lett., 10.1246/cl.2002.1252, 12, 1252-1253, No.12, 1252-1253, 2002.11. |
| 201. |
M.-a. Morikawa, N. Kimizuka, M. Yoshihara, T. Endo, New Colorimetric Detection of Glucose by Means of Electron-Accepting Indicators: Ligand Substitution of [Fe(acac)3-n(phen)n]n+ Complexes Triggered by Electron Transfer from Glucose Oxidase, Chemistry-A European Journal, 10.1002/1521-3765(20021216)8:243.0.CO;2-V, 8, 24, 5580-5584, 8, No. 24, 5580-5584, 2002.11. |
| 202. |
T. Nakashima, N. Kimizuka, Vesicles in Salt: Formation of Bilayer Membranes from Dialkyldimethylammonium Bromides in Ether-containing Ionic Liquids., Chem. Lett., 10.1246/cl.2002.1018, 10, 1018-1019, No.10. 1018-1019, 2002.10. |
| 203. |
T. Nakashima, N. Kimizuka, Light-Harvesting Supramolecular Hydrogels Assembled from Short-legged Cationic L-Glutamate Derivatives and Anionic Fluorophores., Adv. Mater., 10.1002/1521-4095(20020816)14:163.0.CO;2-U, 14, 16, 1113-1116, 14, No. 16, 1113-1116, 2002.08. |
| 204. |
T. Yonezawa, S. Onoue, N. Kimizuka, Formation of Nanoparticle Arrays at the Interlayer of Aqueous Phosphate Bilayers., Chem. Lett., 10.1246/cl.2002.528, 5, 528-529, No.5, 528-529, 2002.05. |
| 205. |
C.-S. Lee, N. Kimizuka, Pillared honeycomb nano-architectures formed on solid surfaces by the self-assembly of lipid-packaged one-dimensional Pt complexes., Proc.Natl.Acad.Sci., 10.1073/pnas.062011099, 99, 8, 4922-4926, 99, No.8, 4922-4926, 2002.04. |
| 206. |
C.-S. Lee, Y. Hatanaka, N. Kimizuka, Effect of Lipid-Packaging on the Charge Transfer Characteristics of One-Dimensional, Mixed-Valence Platinum Complexes, Int. J. Nanoscience, 10.1142/S0219581X02000383, 1, 5-6, 391-395, 1, No.5-6, 1-5, 2002.01. |
| 207. |
N. Kimizuka, Supramolecular Architectures toward Biological Applications, In Supramolecular Design for Biological Applications, Chapter 18, Edited by Yui N, Boca Raton: CRC press, 373-396, 2002.01. |
| 208. |
A. Ikeda, K. Sonoda, M. Ayabe, S. Tamaru, T. Nakashima, N. Kimizuka, S. Shinkai, Gelation of Ionic Liquids with a Low Molecular-Weight Gelator Showing Tgel above 100℃, Chem. Lett., 11, 1154-1155, No.11. 1154-1155, 2001.11. |
| 209. |
N. Kimizuka, T. Nakashima, Spontaneous self-assembly of glycolipid bilayer membranes in sugar-philic ionic liquids and formation of ionogels, Langmuir, 10.1021/la015523e, 17, 22, 6759-6761, 17, 6759-6761, 2001.10. |
| 210. |
T. Kawasaki, M. Tokuhiro, N. Kimizuka, T. Kunitake, Hierarchical Self-Assembly of Chiral Complementary Hydrogen Bond Networks in Water. Reconstitution of Supramolecular Membranes, J. Am. Chem. Soc., 10.1021/ja010035e, 123, 28, 6792-6800, 123, No. 28 , 6792-6800, 2001.06. |
| 211. |
N. Kimizuka, A. Baba, T. Kunitake, Supramolecular Holoenzymes. Activity Modulation of Endonuclease by the Use of Synthetic Bilayer Membranes as Regulatory Cofactors, J. Am. Chem. Soc., 10.1021/ja0030313, 123, 8, 1764-1765, 123, No.8, 1764-1765, 2001.02. |
| 212. |
T. Yonezawa, K. Yasui, N. Kimizuka, Controlled Formation of Smaller Gold Nanoparticles by the Use of Four-Chained Disulfide Stabilizer, Langmuir, 10.1021/la001247c, 17, 2, 271-273, 17, No.2, 271-273, 2001.01. |
| 213. |
T. Yonezawa, S. Onoue, N. Kimizuka, Formation of Uniform Fluorinated Gold Nanoparticles and Their Highly Ordered Hexagonal Packing Monolayer, Langmuir, 10.1021/la001427m, 17, 8, 2291-2293, 17, No.8, 2291-2293, 2001.01. |
| 214. |
T. Yonezawa, K. Imamura, N. Kimizuka, Direct Preparation and Size Control of Palladium Nanoparticle Hydrosols by Water-Soluble Isocyanide Ligands, Langmuir, 10.1021/la0101954, 17, 16, 4701-4703, 17, 4701-4703, 2001.01. |
| 215. |
T. Yonezawa, S. Onoue, N. Kimizuka, Self-Organized Superstructures of Fluorocarbon-Stabilized Silver Nanoparticles, Adv. Mater., 10.1002/1521-4095(200101)13:23.0.CO;2-H, 13, 2, 140-142, 13, No.2, 140-142, 2001.01. |
| 216. |
N. Kimizuka, Towards Self-Assembling Inorganic Molecular Wires, Adv. Mater., 10.1002/1521-4095(200010)12:193.0.CO;2-X, 12, 19, 1461-1463, 12, No.19, 1461-1463, 2000.10. |
| 217. |
N. Kimizuka, N. Oda, T. Kunitake, Self-Assembling Molecular Wires of Halogen-Bridged Platinum Complexes in Organic Media. Mesoscopic Supramolecular Assemblies Consisting of a Mixed Valent Pt(II)/Pt(IV) Complex and Anionic Amphiphiles., Inorg. Chem., 10.1021/ic000189f, 39, 12, 2684-2689, 39, 2684-2689, 2000.06. |
| 218. |
N. Kimizuka, K. Yamada, T. Kunitake, Organization of One-dimensional Mixed-Valence Platinum Complexes at the Air-Water Interface and in Langmuir-Blodgett Films, Liq. Cryst. Mol. Cryst., 10.1080/10587250008038252, 342, 103-110, 342, 103-110, 2000.06. |
| 219. |
N. Kimizuka, S. H. Lee and T. Kunitake, Molecular Dispersion of Hetero-Metallic Mixed Valence Chains of [M(en)2][MCl2(en)2] (M: Pt, Pd, Ni) and Anionic Amphiphiles in Organic Media, Angew. Chem. Int. Ed. Engl., 39, No.2, 389-391, 2000.01. |
| 220. |
N. Kimizuka, H. Ohira, K. Hattori and T. Kunitake, Morphological Transcription of Monolayer Domains to Aggregates. Specific Adsorption of Cyanine Dyes to Pre-compressed Chiral Monolayers, Colloid and Surfaces, 10.1016/S0927-7757(99)00552-X, 171, 1-3, 265-274, 171, 265-274, 2000.01. |
| 221. |
T. Yonezawa, S. Onoue, N. Kimizuka, Preparation of Highly Positively Charged Silver Nanoballs and Their Stability, Langmuir, 10.1021/la000186f, 16, 12, 5218-5220, 16, 5218-5220, 2000.01. |
| 222. |
N. Kimizuka, E. Watanabe and T. Kunitake, Lanthanide Ion-Mediated Hydrolysis of DNA on Phosphate Bilayer Membrane, Chem. Lett., 1, 29-30, 29-30, 1999.01. |
| 223. |
N. Kimizuka, M. Tanaka, T. Kunitake, Spatially Controlled Synthesis of Protein/Inorganic Nano-assembly: Alternate Molecular Layers of Cyt c and TiO2 Nanoparticles, Chem. Lett., 10.1246/cl.1999.1333, 12, 1333-1334, 1333-1334, 1999.01. |
| 224. |
N. Kimizuka, T. Kawasaki, K. Hirata and T. Kunitake, Supramolecular Membrane: Spontaneous Assembly of Aqueous Bilayer Membrane via Formation of Hydrogen-Bonded Pairs of Melamine and Cyanuric Acid Derivatives, J. Am. Chem. Soc, 10.1021/ja974379+, 120, 17, 4094-4104, 120,17,4094-4104, 1998.11. |
| 225. |
N. Kimizuka, N. Oda and T. Kunitake, Supramolecular Assemblies Comprised of One-Dimensional Mixed Valence Platinum Complex and Anionic Amphiphiles in Organic Media, Chem. Lett., 10.1246/cl.1998.695, 7, 695-696, 695-696, 1998.01. |
| 226. |
N. Kimizuka, S. Fujikawa and T. Kunitake, Protein Assembly on Solid Surfaces by Gel-Assisted Transfer (GAT) Technique, Chem. Lett, 10.1246/cl.1998.821, 8, 821-822, 821-822, 1998.01. |
| 227. |
N. Kimizuka, M. Shimizu, S. Fujikawa, K. Fujimura, M. Sano and T. Kunitake, AFM Observation of Organogel Nanostructures on Graphite in the Gel-Assisted Transfer Technique, Chem. Lett., 10.1246/cl.1998.967, 10, 967-968, 967-968, 1998.01. |
| 228. |
N. Kimizuka, S. Fujikawa and T. Kunitake, Organization of Hydrophilic Nanoparticles on Hydrogel Surface and Their Gel-Assisted Transfer to Solid Substrates, Adv. Mater., 10.1002/(SICI)1521-4095(199811)10:163.0.CO;2-T, 10, 16, 1373-+, 10巻, 1373-1376, 1998.01. |
| 229. |
Nobuo Kimizuka, Nobuhiro Yanai, Recent emergence of photon upconversion based on triplet energy migration in molecular assemblies, CHEMICAL COMMUNICATIONS, 10.1039/c6cc00089d, 52, 31, 5354-5370. |
| 230. |
Pengfei Duan, Deepak Athana, Takuya Nakashima, Tsuyoshi Kawai, Nobuhiro Yanai, Nobuo Kimizuka, All-or-none switching of photon upconversion in self-assembled organogel systems, FARADAY DISCUSSIONS, 10.1039/c6fd00170j, 196, 305-316. |
| 231. |
Nobuhiro Yanai, Nobuo Kimizuka, Recent emergence of photon upconversion based on triplet energy migration in molecular assemblies (vol 52, pg 5354, 2016), CHEMICAL COMMUNICATIONS, 10.1039/c6cc90564a, 53, 3, 655-655. |
