Updated on 2024/10/09

Information

 

写真a

 
OGAWA TOMOHIRO
 
Organization
Faculty of Science Department of Chemistry Assistant Professor
School of Sciences Department of Chemistry(Concurrent)
Graduate School of Sciences Department of Chemistry(Concurrent)
Title
Assistant Professor
Contact information
メールアドレス
Tel
0928024164

Degree

  • Ph.D. in Science

Research Interests・Research Keywords

  • Research theme: Synthesis and time-resolved spectroscopy of photofunctional molecules

    Keyword: ・Coordination compounds ・Photochemistry・Time-resolved spectroscopy

    Research period: 2023.10

Awards

  • 優秀講演賞 RSCJMCA講演賞

    2023.8   複合系の光機能研究会   配位化合物の光化学討論会にて口頭発表を行い、研究結果に高い評価を得て、優秀講演を受賞した。

Papers

  • Broad‐Wavelength Light‐Fueled Organic Crystal Oscillators Driven by Multimodal Photothermally Resonated Natural Vibration

    Shodai Hasebe, Yuki Hagiwara, Taiki Goto, Tomohiro Ryu, Takumi Ehara, Tomohiro Ogawa, Kiyoshi Miyata, Ken Onda, Ryota Morioka, Junko Morikawa, Toru Asahi, Hideko Koshima

    Advanced Functional Materials   2024.8   ISSN:1616-301X eISSN:1616-3028

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    Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    Abstract

    Photomechanical crystals have applications in light‐fueled actuators and soft robots. Herein, light‐responsive, versatile, anthraquinone dye crystal oscillators actuated via natural vibrations that are resonated by a photothermal effect are described. A black needle‐shaped crystal cantilever oscillates at 70 Hz in the first mode of natural vibration upon irradiation by broad‐wavelength light ranging from the ultraviolet through the visible to the near‐infrared, and also under continuous‐wavelength light (400–2000 nm). The second and third natural vibration modes are induced at higher frequencies (530 and 1350 Hz) and evidence complex flagellum‐like motions. The frequency can be readily tuned by moving the support of a crystal piece; this is analogous to playing a guitar. The crystal exhibits high durability (more than 10 000 cycles): the high elasticity prevents deterioration. Oscillatory motions can be designed via simulations using finite element analysis. This work will facilitate the use of photomechanical crystals in light‐fueled soft robots.

    DOI: 10.1002/adfm.202410671

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  • Nickel(II) Analogues of Phosphorescent Platinum(II) Complexes with Picosecond Excited-State Decay. International journal

    Tomohiro Ogawa, Oliver S Wenger

    Angewandte Chemie (International ed. in English)   e202312851   2023.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    Square-planar Ni(II) complexes are interesting as cheaper and more sustainable alternatives to Pt(II) luminophores widely used in lighting and photocatalysis. We investigated the excited-state behavior of two Ni(II) complexes, which are isostructural with two luminescent Pt(II) complexes. The initially excited singlet metal-to-ligand charge transfer (1MLCT) excited states in the Ni(II) complexes decay to metal-centered (3MC) excited states within less than 1 picosecond, followed by non-radiative relaxation of the 3MC states to the electronic ground state within 9 - 21 ps. This contrasts with the population of an emissive triplet ligand-centered (3LC) excited state upon excitation of the Pt(II) analogues. Structural distortions of the Ni(II) complexes are responsible for this discrepant behavior and lead to dark 3MC states far lower in energy than the luminescent 3LC states of Pt(II) compounds. Our findings suggest that if these structural distortions could be restricted by more rigid coordination environments and stronger ligand fields, the excited-state relaxation in four-coordinate Ni(II) complexes could be decelerated such that luminescent 3LC or 3MLCT excited states become accessible. These insights are relevant to make Ni(II) fit for photophysical and photochemical applications that relied on Pt(II) until now.

    DOI: 10.1002/anie.202312851

  • Better Covalent Connection in a Molecular Triad Enables More Efficient Photochemical Energy Storage

    Tobias H. Bürgin, Tomohiro Ogawa, Oliver S. Wenger

    Inorganic Chemistry   2023.8

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    Language:Others   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/acs.inorgchem.3c02008

  • Molecular Design Principles to Elongate the Metal-to-Ligand Charge Transfer Excited-State Lifetimes of Square-Planar Nickel(II) Complexes

    Tomohiro Ogawa, Narayan Sinha, Björn Pfund, Alessandro Prescimone, Oliver S. Wenger

    Journal of the American Chemical Society   2022.11

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    Language:Others   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/jacs.2c08838

  • Coordination polymer-forming liquid Cu (2-isopropylimidazolate) Reviewed International journal

    Teerat Watcharatpong, Taweesak Pila, Thana Maihom, Tomohiro Ogawa, Takuya Kurihara, Koji Ohara, Tadashi Inoue, Hiroyasu Tabe, Yong-Sheng Wei, Kanokwan Kongpatpanich, Satoshi Horike

    Chemical Science   2022.9

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    Language:English   Publishing type:Research paper (scientific journal)  

  • Network Size Control in Coordination Polymer Glasses and Its Impact on Viscosity and H+ Conductivity Reviewed

    Tomohiro Ogawa, Kazuki Takahashi, Takuya Kurihara, Sanjog S. Nagarkar, Koji Ohara, Yusuke Nishiyama, Satoshi Horike

    Chemistry of Materials   34 ( 13 )   5832 - 5841   2022.7

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    Language:Others   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/acs.chemmater.2c00494

  • Stable melt formation of 2D nitrile-based coordination polymer and hierarchical crystal-glass structuring Reviewed

    Chinmoy Das, Tomohiro Ogawa, Satoshi Horike

    CHEMICAL COMMUNICATIONS   56 ( 63 )   8980 - 8983   2020.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    Crystal melting and vitrification of nitrile-based two-dimensional coordination polymer (CP) were studied. The crystal melts at 169 degrees C and has a wide liquid-state temperature window of over 110 degrees C. The crystalline state transformed to a glassy state by melt-quench or mechanical milling. The mechanically induced glass showed permanent porosity, and it also showed glass-to-crystal transformation upon solvent treatment. Surface crystallization on top of the grain-boundary-free glass monolith was demonstrated.

    DOI: 10.1039/d0cc03691a

  • Intense Red‐Blue Luminescence Based on Superfine Control of Metal‐Metal Interactions for Self‐Assembled Platinum(II) Complexes Reviewed

    Daisuke Saito, Tomohiro Ogawa, Masaki Yoshida, Junichi Takayama, Satoshi Hiura, Akihiro Murayama, Atsushi Kobayashi, Masako Kato

    Angewandte Chemie International Edition   59 ( 42 )   18723 - 18730   2020.7

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    Language:Others   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/anie.202008383

  • A New Dimension for Coordination Polymers and Metal–Organic Frameworks: Towards Functional Glasses and Liquids Reviewed

    Satoshi Horike, Sanjog S. Nagarkar, Tomohiro Ogawa, Susumu Kitagawa

    Angewandte Chemie - International Edition   59 ( 17 )   6652 - 6664   2020.4

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    © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim There are two categories of coordination polymers (CPs): inorganic CPs (i-CPs) and organic ligand bridged CPs (o-CPs). Based on the successful crystal engineering of CPs, we here propose noncrystalline states and functionalities as a new research direction for CPs. Control over the liquid or glassy states in materials is essential to obtain specific properties and functions. Several studies suggest the feasibility of obtaining liquid/glassy states in o-CPs by design principles. The combination of metal ions and organic bridging ligands, together with the liquid/glass phase transformation, offer the possibility to transform o-CPs into ionic liquids and other ionic soft materials. Synchrotron measurements and computational approaches contribute to elucidating the structures and dynamics of the liquid/glassy states of o-CPs. This offers the opportunity to tune the porosity, conductivity, transparency, and other material properties. The unique energy landscape of liquid/glass o-CPs offers opportunities for properties and functions that are complementary to those of the crystalline state.

    DOI: 10.1002/anie.201911384

  • Coordination polymer glass from a protic ionic liquid: proton conductivity and mechanical properties as an electrolyte Reviewed International journal

    Tomohiro Ogawa, Kazuki Takahashi, Sanjog S Nagarkar, Koji Ohara, You-lee Hong, Yusuke Nishiyama, Satoshi Horike

    Chemical Science   2020.4

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    Language:English   Publishing type:Research paper (scientific journal)  

  • Phosphorescence Properties of Anionic Cyclometalated Platinum(II) Complexes with Fluorine-substituted Tridentate Diphenylpyridine in the Solid State Reviewed

    Tomohiro Ogawa, W.M.C. Sameera, Masaki Yoshida, Atsyshi Kobayashi, Masako Kato

    Chemical Physics Letters   739   137024   2020.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    Phosphorescence Properties of Anionic Cyclometalated Platinum(II) Complexes with Fluorine-substituted Tridentate Diphenylpyridine in the Solid State

  • Phosphorescence Properties of Discrete Platinum(II) Complex Anions Bearing N-Heterocyclic Carbenes in the Solid State Reviewed

    Ogawa Tomohiro, Sameera W. M. C, Saito Daisuke, Yoshida Masaki, Kobayashi Atsushi, Kato Masako

    INORGANIC CHEMISTRY   57 ( 22 )   14086 - 14096   2018.11

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    Phosphorescence Properties of Discrete Platinum(II) Complex Anions Bearing N-Heterocyclic Carbenes in the Solid State

    DOI: 10.1021/acs.inorgchem.8601654

  • Luminescent ionic liquids based on cyclometalated platinum (II) complexes exhibiting thermochromic behaviour in different colour regions Reviewed International journal

    T Ogawa, WMC Sameera, M Yoshida, A Kobayashi, M Kato

    Dalton Transaction   2018.3

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  • Effect of Water Coordination on Luminescent Properties of Pyrazine-Bridged Dinuclear Cu(I) Complexes Reviewed

    Atsushi Kobayashi, Ryuya Arata, Tomohiro Ogawa, Masaki Yoshida, Masako Kato

    INORGANIC CHEMISTRY   56 ( 8 )   4280 - 4288   2017.4

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    Two luminescent pyrazine-bridged dinuclear Cu(I) complexes, namely, [{Cu(PPh3)(2)(H2O)}(mu-MeOpyz){ Cu (PPh3)(2)(CH3CN)}] (BF4)(2) and [{Cu (PPh3)(2)(H2O)} (mu-MeOpyz){Cu(PPh3)(2)(H2O)}] (BF4)(2)(H2O-Cu(2-)AN PPh3 = triphenylphosphine, MeOpyz = 2-methoxypyrazine), were successfully synthesized and characterized by single-crystal X-ray diffraction and luminescence measurements. X-ray analysis revealed that the water molecules are coordinated to both Cu(I) ions to form almost the same P2N1O1 coordination structure in H2O-Cu-2-H2O, whereas one of the two Cu ions in H2O-Cu-2-AN was coordinated by acetonitrile instead of water to form a different P2N2 coordination environment. The asymmetric H2O-Cu-2-AN exhibits very bright yellow-green emission with a high emission quantum yield (lambda(em) = 550 nm, Phi= 0.70) at room temperature in the solid state in spite of the coordination of water molecule, which usually tends to deactivate the emissive state through O H vibration. The intense emission at room temperature is a result of thermally activated delayed fluorescence, and the remarkable temperature dependence of emission lifetimes indicates the existence of unique multiple emission states for the asymmetric dinuclear complex. In contrast, the emission of H2O-Cu-2-H2O was observed at longer wavelengths with remarkably a lower quantum yield (lambda(em) = 580 nm, Phi = 0.05). Time-dependent density functional theory calculations suggested that the emission could result from the metal-to-ligand charge-transfer transition state. However, it could be rapidly deactivated by the structural distortion around the Cu ion with a less-bulky coordination environment in H2O-Cu-2-H2O.

    DOI: 10.1021/acs.inorgchem.6b02578

  • Reversible luminescent colour changes of mononuclear copper(I) complexes based on ligand exchange reactions by N-heteroaromatic vapours Reviewed

    Hiroki Ohara, Tomohiro Ogawa, Masaki Yoshida, Atsushi Kobayashi, Masako Kato

    DALTON TRANSACTIONS   46 ( 11 )   3755 - 3760   2017.3

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    [CuCl(PPh3)(2)(4-Mepy)] (PPh3 = triphenylphosphine, 4-Mepy = 4-methylpyridine), a highly blue-luminescent mononuclear copper(I) complex, shows reversible emission colour change ranging from blue-green to red by vapour exposure to N-heteroaromatics, such as pyridine, pyrimidine, and 2-methylpyrazine. The remarkable colour changes occur due the ligand exchange reaction between the solid and gas. Such ligand exchange reactions would be applicable to various vapours with coordination ability and be useful for the sensing of such volatile organic compounds as well as a new convenient methodology for the preparation of luminescent complexes.

    DOI: 10.1039/c7dt00532f

  • Impact of a Carboxyl Group on a Cyclometalated Ligand: Hydrogen-Bond- and Coordination-Driven Self-Assembly of a Luminescent Platinum(II) Complex Reviewed

    Masanori Ebina, Atsushi Kobayashi, Tomohiro Ogawa, Masaki Yoshida, Masako Kato

    INORGANIC CHEMISTRY   54 ( 18 )   8878 - 8880   2015.9

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    A new luminescent cyclometalated platinum(II) complex containing a carboxyl group, trans-[Pt(pcppy)(pic)] [1-COOH; Hpcppy = 2-(p-carboxyphenyl)pyridine and Hpic = picolinic acid] has been synthesized and characterized. The luminescence behavior of 1-COOH in the solid and solution states is completely different despite the similarity of the luminescence in both states for the nonsubstituted complex, [Pt(ppy)(pic)] (1-H; Hppy = 2-phenylpyridine). Interestingly, 1-COOH exhibits concentration-dependent absorption and emission behavior based on its aggregation in a basic aqueous solution despite the absence of amphiphilic character.

    DOI: 10.1021/acs.inorgchem.5b01343

  • A dual-emissive Ionic Liquid Based on an Anionic Platinum(II) Complex Reviewed International journal

    T. Ogawa, M. Yoshida, H. Ohara, A. Kobayashi, M. Kato

    Chemical Communications   2015.7

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  • Systematic Syntheses and Metalloligand Doping of Flexible Porous Coordination Polymers Composed of a Co(III)-Metalloligand Reviewed

    Atsushi Kobayashi, Yui Suzuki, Tadashi Ohba, Tomohiro Ogawa, Takeshi Matsumoto, Shin-ichiro Noro, Ho-Chol Chang, Masako Kato

    INORGANIC CHEMISTRY   54 ( 6 )   2522 - 2535   2015.3

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    A series of flexible porous coordination polymers (PCPs) RE-Co, composed of a Co(III)-metalloligand [Co(dcbpy)(3)](3-) (Co; H(2)dcbpy = 4,4'-dicarboxy-2,2'-bipyridine) and lanthanide cations (RE3+ = La3+, Ce3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Tb3+, Er3+), was systematically synthesized. X-ray crystallographic analysis revealed that the six carboxylates at the top of each coordination octahedron of Co(III)-metalloligand were commonly bound to RE3+ cations to form a rock-salt-type porous coordination framework. When RE-Co contains a smaller and heavier RE3+ cation than Nd3+, the RE-Co crystallized in the cubic Fm-3m space group, whereas the other three RE-Co with larger RE3+ crystallized in the lower symmetrical orthorhombic Fddd space group, owing to the asymmetric 10-coordinated bicapped square antiprism structure of the larger RE3+ cation. Powder X-ray diffraction and vapor-adsorption isotherm measurements revealed that all synthesized RE-Co PCPs show reversible amorphous-crystalline transitions, triggered by water-vapor-adsorption/desorption. This transition behavior strongly depends on the kind of RE3+; the transition of orthorhombic RE-Co was hardly observed under exposure to CH3OH vapor, but the RE-Co with smaller cations such as Gd3+ showed the transition under exposure to CH3OH vapors. Further tuning of vapor-adsorption property was examined by doping of Ru(II)-metalloligands, [Ru(dcbpy)(3)](4-), [Ru(dcbpy)(2)Cl-2](4-), [Ru(dcbpy)(tpy)Cl](-), and [Ru(dcbpy)(dctpy)](3-) (abbreviated as RuA, RuB, RuC, and RuD, respectively; tpy = 2,2':6',2?-terpyridine, H2dctpy = 4,4"-dicarboxy-2,2':6',2"-terpyridine), into the Co(III)-metalloligand site of Gd-Co to form the Ru(II)-doped PCP RuX@Gd-Co (X = A, B, C, or D). Three Ru(II)-metalloligands, RuA, RuB, and RuD dopants, were found to be uniformly incorporated into the Gd-Co framework by replacing the original Co(III)-metalloligand, whereas the doping of RuC failed probably because of the less number of coordination sites. In addition, we found that the RuA doping into the Gd-Co PCP had a large effect on vapor-adsorption due to the electrostatic interaction originating from the negatively charged RuA sites in the framework and the charge-compensating Li+ cations in the porous channel.

    DOI: 10.1021/ic5021302

  • Self-association and columnar liquid crystalline phase of cationic alkyl-substituted-bipyridine benzenedithiolato gold(iii) complexes Reviewed

    Tomohiro Ogawa, Misaki Sakamoto, Hirotaka Honda, Takeshi Matsumoto, Atsushi Kobayashi, Masako Kato, Ho-Chol Chang

    Dalton Transactions   42 ( 45 )   15995 - 16005   2013.12

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    The introduction of a Au(iii) ion into a mesogenic core, [M(Bdt)(Cnbpy)]+ (Bdt = 1,2-benzenedithiolato and Cnbpy = 4,4′-di-alkyl-2,2′-bipyridine (n = 13 (4,4′-di-tridecyl-2, 2′-bipyridine (C13bpy)) and 8,10 (4,4′-di-(3-octyltridecyl)-2, 2′-bipyridine (C8,10bpy)))), leads to the formation of ionic molecular assemblies in crystalline and mesophases. Successive syntheses of precursor complexes, [AuCl2(Cnbpy)]PF6 (n = 13 (1) and 8,10 (2)), followed by the target complexes, [Au(Bdt)(Cnbpy)]PF6 (n = 13 (3) and 8,10 (4)), were achieved. The crystallographic analysis of 3 revealed that the central cationic cores form a characteristic one-dimensional columnar structure, which is an essential property for the formation of columnar structures in the liquid crystalline phase. The central cores of the [Au(Bdt)(C13bpy)]+ cations in 3 stack alternatively so as to cancel out their dipole moments and the counteranions lie between the cationic columns. Furthermore, the introduction of the branched alkyl tails in 4 induces the formation of a rectangular columnar liquid crystalline phase (Colr) with C2/m symmetry, and it melts to an isotropic liquid at 69 °C. The Colr phase of 4 is partially similar in its liquid crystalline structure to the neutral [Pt(Bdt)(C8,10bpy)] liquid crystal in a hexagonal columnar phase reported previously, while complex 4 shows a lower clearing point than that of the Pt analogue. Based on these results, the present study demonstrates the designability of the liquid crystalline structures of the [M(Bdt)(C8,10bpy)] skeleton together with their assembled structures and physico-chemical properties. © 2013 The Royal Society of Chemistry.

    DOI: 10.1039/c3dt51444g

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Professional Memberships

  • The Japanese Photochemistry Association

  • Japan Society for Molecular Science

  • The Photofunctional Complexes Research Association Japan

  • Japan Society of Coordination Chemistry

  • The Chemical Society of Japan

Committee Memberships

  • 複合系の光機能研究会   将来構想委員   Domestic

    2024.4   

  • 錯体化学若手の会   九州支部世話人   Domestic

    2024.4   

Educational Activities

  • Teaching on practical of analytical chemistry and mentoring of undergrad and graduated students

Outline of Social Contribution and International Cooperation activities

  • N/A