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

DOI： 10.1002/chem.201603817

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

DOI： 10.1246/cl.130118

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

DOI： 10.1021/ja1027953

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

DOI： 10.1021/ja0767579

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

DOI： 10.1039/d3dt03915c

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

DOI： 10.1021/jacs.3c07545

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

DOI： 10.1039/d3sc03432a

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

DOI： 10.1021/jacs.3c02977

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

DOI： 10.1002/chem.202202161

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

DOI： 10.1002/anie.202208771

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

Capability to control macroscopic molecular properties with external stimuli offers the possibility to exploit molecules as switching devices of various types. However, application of such molecular-level switching has often been limited by its speed and thus efficiency. Herein, we demonstrate ultrafast, photoinduced polarization switching in the crystal of a [CrCo] dinuclear complex by ultrafast pump–probe spectroscopy in the visible and mid-infrared regions. The photoinduced polarization switching was found to have a time constant of 280 fs, which makes the [CrCo] complex crystal the fastest polarization-switching material realized using the metastable state. Moreover, the pump–probe data in the visible region reveal the pronounced appearance of coherent nuclear wavepacket motion with a frequency as low as 22 cm⁻¹, which we attribute to a lattice vibrational mode. The pronounced non-Condon effect for its resonance Raman enhancement implies that this mode couples the relevant electronic states, thereby facilitating the ultrafast polarization switching.

DOI： 10.1002/anie.202004583

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

Orbital angular momentum plays a vital role in various applications, especially magnetic and spintronic properties. Therefore, controlling orbital angular momentum is of paramount importance to both fundamental science and new technological applications. Many attempts have been made to modulate the ligand-field-induced quenching effects of orbital angular momentum to manipulate magnetic properties. However, to date, reported changes in the magnitude of orbital angular momentum are small in both molecular and solid-state magnetic materials. Moreover, no effective methods currently exist to modulate orbital angular momentum. Here we report a dynamic bond approach to realize a large change in orbital angular momentum. We have developed a Co(II) complex that exhibits coordination number switching between six and seven. This cooperative dynamic bond switching induces considerable modulation of the ligand field, thereby leading to substantial quenching and restoration of the orbital angular momentum. This switching mechanism is entirely different from those of spin-crossover and valence tautomeric compounds, which exhibit switching in spin multiplicity.

DOI： 10.1021/jacs.0c02257

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

Some cyanide-bridged complexes are known for exhibiting slow magnetic relaxation behavior in a light-induced metastable state. Herein, an unexpected reverse effect is observed for the first time in the S= (Formula presented.) {Fe^II _LS-Co^III _LS-Fe^III _LS} (HS=high spin, LS=low spin) ground state of a novel V-shaped trinuclear cyanide-bridged {Fe₂Co} complex. In this complex, light-switchable iron-cobalt charge transfer with repeatable off/on switching of slow magnetic relaxation is discovered upon alternating laser irradiation at 785 and 560 nm. An important characteristic of the present compound is that the S= (Formula presented.) ground state exhibits slow magnetic relaxation before irradiation, whereas this is accelerated after irradiation. This is different from the typical behavior, where the light-induced metastable state exhibits slow magnetic relaxation.

DOI： 10.1002/chem.202000154

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

The study of transition metal clusters exhibiting fast electron hopping or delocalization remains challenging, because intermetallic communications mediated through bridging ligands are normally weak. Herein, we report the synthesis of a nanosized complex, [Fe(Tp)(CN)₃]₈[Fe(H₂O)(DMSO)]₆ (abbreviated as [Fe₁₄], Tp⁻, hydrotris(pyrazolyl)borate; DMSO, dimethyl sulfoxide), which has a fluctuating valence due to two mobile d-electrons in its atomic layer shell. The rate of electron transfer of [Fe₁₄] complex demonstrates the Arrhenius-type temperature dependence in the nanosized spheric surface, wherein high-spin centers are ferromagnetically coupled, producing an S = 14 ground state. The electron-hopping rate at room temperature is faster than the time scale of Mössbauer measurements (<~10⁻⁸ s). Partial reduction of N-terminal high spin Fe^III sites and electron mediation ability of CN ligands lead to the observation of both an extensive electron transfer and magnetic coupling properties in a precisely atomic layered shell structure of a nanosized [Fe₁₄] complex.

DOI： 10.1038/s41467-019-13279-y

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

DOI： 10.1246/bcsj.20190219

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

Intermediate amide complexes of NHC-ligated monovalent nickel in Buchwald-Hartwig amination of aryl halides were isolated and structurally characterized. The amide complexes reacted with aryl bromide to form a cross-coupling product. Lowerature observation of the oxidative addition product of the Ni(i) amide complex with aryl bromide indicated the presence of a Ni(iii) intermediate. The results showed that a well-defined mononuclear NHC-Ni(i) complex can act as a key intermediate in homogeneous catalysis.

DOI： 10.1039/c8cy02427h

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

DOI： 10.1002/anie.201606165

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

DOI： 10.1002/anie.201607886

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

A series of three-coordinate monovalent nickel halide complexes bearing N-heterocyclic carbene (NHC) ligands, i.e., NiCl(IPr)(L) [L = pyridine, P(OPh)₃, bis(diphenylphosphino)butane (dppb), IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene], NiX(IMes)(PPh₃) (X = Cl and Br, IMes = 1,3-bis(mesityl)imidazol-2-ylidene), were prepared. The complexes were identified using NMR spectroscopy, superconducting quantum interference device (SQUID), and X-ray crystallography. Additionally, ESR spectra of NiCl(IPr)(pyridine) were taken in toluene. These complexes had three-coordinate Y-shaped geometries in both the solid and solution states. The compounds containing IPr showed equilibrium between the monomeric and dimeric forms, with liberation of ligands. Addition of 1,2-bis(diphenylphosphino)ethane and 1,3-bis(diphenylphosphino)propane to the dinickel(I) IPr complex instead of dppb resulted in heterolytic cleavage to nickel(0) and nickel(II) species. Catalysis of Suzuki cross-coupling and Buchwald-Hartwig amination of aryl bromide using the complexes was investigated. The efficiencies in the amination of aryl bromide depended strongly on the additional donor ligands.

DOI： 10.1021/acs.organomet.6b00419

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

Heterometallic Prussian blue analogues are known to exhibit thermally induced charge transfer, resulting in switching of optical and magnetic properties. However, charge-transfer phase transitions have not been reported for the simplest FeFe cyanide-bridged systems. A mixed-valence Fe-II/Fe-III cyanide-bridged coordination polymer, {[Fe(Tp)(CN)(3)](2)Fe(bpe)5H(2)O}(n), which demonstrates a thermally induced charge-transfer phase transition, is described. As a result of the charge transfer during this phase transition, the high-spin state of the whole system does not change to a low-spin state. This result is in contrast to FeCo cyanide-bridged systems that exhibit charge-transfer-induced spin transitions.
キーワード

DOI： 10.1002/anie.201601526

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

Flexible porous materials generally switch their structures in response to guest removal or incorporation. However, the design of porous materials with empty shape-switchable pores remains a formidable challenge. Here, we demonstrate that the structural transition between an empty orthorhombic phase and an empty tetragonal phase in a flexible porous dodecatuple intercatenated supramolecular organic framework can be controlled cooperatively through guest incorporation and thermal treatment, thus inducing empty shape-memory nanopores. Moreover, the empty orthorhombic phase was observed to exhibit superior thermoelasticity, and the molecular-scale structural mobility could be transmitted to a macroscopic crystal shape change. The driving force of the shape-memory behaviour was elucidated in terms of potential energy. These two interconvertible empty phases with different pore shapes, that is, the orthorhombic phase with rectangular pores and the tetragonal phase with square pores, completely reject or weakly adsorb N-2 at 77 K, respectively.

DOI： 10.1038/ncomms11564

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

Dinuclear iron carbonyl complex 2, which contains an elongated unsupported Fe-Fe bond, was synthesized by the reaction between Fe-2(CO)(9) and phosphinyl radical 1. Thermal Fe-Fe bond homolysis led to the generation of a four-coordinate carbonyl-based iron-centered radical, 3, which is stabilized by pi-donation. Complex 3 exhibited high reactivity toward organic radicals to form diamagnetic five-coordinate Fe(II) complexes.

DOI： 10.1039/c5sc02601f

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

The Fe^III anionic complex exhibiting cooperative spin transition with a wide thermal hysteresis near room temperature, K[Fe(5-Brthsa)₂] (5-Brthsa-H₂=5-bromosalicylaldehyde thiosemicarbazone), is reported. The hysteresis shows a one-step transition in heating mode and a two-step transition in cooling mode. X-ray structure analysis shows the coexistence of hydrogen bond and cation-π interactions, along with metal coordination bonds, to give 2D coordination polymer structure.

DOI： 10.1002/chem.201680262

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

The anionic Fe-III complex exhibiting cooperative spin transition with a wide thermal hysteresis near room temperature, K[Fe(5-Brthsa)(2)] (5-Brthsa-H-2=5-bromosalicylaldehyde thiosemicarbazone), is reported. The hysteresis (Delta=69 K in the first cycle) shows a one-step transition in heating mode and a two-step transition in cooling mode. X-ray structure analysis showed that the coexistence of hydrogen bond and cation-pi interactions, as well as alkali metal coordination bonds, to give 2D coordination polymer structure. This result is contrary to previous reports of broad thermal hysteresis induced by coordination bonds of FeII spin crossover coordination polymers (with 1D/3D structures), and by strong intermolecular interactions in the molecular packing through pi-pi stacking or hydrogen-bond networks. As a consequence, the importance, or the very good suitability of alkali metal-based coordination bonds and cation-pi interactions for communicating cooperative interactions in spin-crossover (SCO) compounds must be reconsidered.

DOI： 10.1002/chem.201503392

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

Harnessing molecular motion to reversibly control macroscopic properties, such as shape and size, is a fascinating and challenging subject in materials science. Here we design a crystalline cobalt(II) complex with an n-butyl group on its ligands, which exhibits a reversible crystal deformation at a structural phase transition temperature. In the low-temperature phase, the molecular motion of the n-butyl group freezes. On heating, the n-butyl group rotates ca. 100 degrees around the C-C bond resulting in 6-7% expansion of the crystal size along the molecular packing direction. Importantly, crystal deformation is repeatedly observed without breaking the single-crystal state even though the shape change is considerable. Detailed structural analysis allows us to elucidate the underlying mechanism of this deformation. This work may mark a step towards converting the alkyl rotation to the macroscopic deformation in crystalline solids

DOI： 10.1038/ncomms9810

Language：English  

DOI： 10.1038/ncomms6955

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

Many molecular machines with controllable molecular-scale motors have been developed. However, transmitting molecular movement to the macroscopic scale remains a formidable challenge. Here we report a single crystal of a Ni complex whose shape changes abruptly and reversibly in response to thermal changes at around room temperature. Variableerature single-crystal X-ray diffraction studies show that the crystalline shape change is induced by an unusual 90° rotation of uniaxially aligned oxalate molecules. The oxalate dianions behave as molecular-scale rotors, with their movement propagated through the entire crystalline material via intermolecular hydrogen bonding. Consequently, the subnanometre-scale changes in the oxalate molecules are instantly amplified to a micrometre-scale contraction or expansion of the crystal, accompanied by a thermal hysteresis loop. The shape change in the crystal was clearly detected under an optical microscope. The large directional deformation and prompt response suggest a role for this material in microscale or nanoscale thermal actuators.

DOI： 10.1038/nchem.2092

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

Both spin-crossover complexes and molecular nanomagnets display bistable magnetic states, potentially behaving as elementary binary units for information storage. It is a challenge to introduce spin-crossover units into molecular nanomagnets to switch the bistable state of the nanomagnets through external stimuli-tuned spin crossover. Here we report an iron(II) spin-crossover unit and paramagnetic iron(III) ions that are incorporated into a well-isolated double-zigzag chain. The chain exhibits thermally induced reversible spin-crossover and light-induced excited spin-state trapping at the iron(II) sites. Single-chain magnet behaviour is actuated accompanying the synergy between light-induced excited spin-state trapping at the iron(II) sites and ferromagnetic interactions between the photoinduced high-spin iron(II) and low-spin iron(III) ions in the chain. The result provides a strategy to switch the bistable state of molecular nanomagnets using external stimuli such as light and heat, with the potential to erase and write information at a molecular level.

DOI： 10.1038/ncomms3826

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

The mononuclear ferric compound Fe(H-5-Cl-thsa-Me)(5-Cl-thsa-Me) ·H₂O (1) was synthesized and characterized using powder/single-crystal X-ray diffraction, Mössbauer spectroscopy, differential scanning calorimetry (DSC), and magnetic susceptibility measurements. This photo-responsive compound shows reversible, two-step spin-crossover behaviour. Moreover, dielectric anomalies were observed during the spin transitions, demonstrating the multifunctional properties of compound 1.

DOI： 10.1039/c3dt51554k

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

DOI： 10.1002/chem.201302272

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

DOI： 10.1002/ejic.201300531

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

Light-induced valence tautomerism (LIVT) and the relaxation process of a mononuclear complex, [Co(phen)(3,5-DTBSQ)(3,5-DTBCat)] (1) (phen = 1,10-phenanthroline, 3,5-DTBSQ = 3,5-di-tert-butyl-semiquinone, 3,5-DTBCat = 3,5-di-tert-butyl-catechol) were investigated by monitoring the ESR signal of the semiquinonate radical both in powder sample and in the sample diluted in butyronitrile or benzene glass matrix. LIVT phenomena were observed in all samples. The ESR signal decay and the relaxation in the glass matrixes were well analyzed by double exponential fitting, indicating the possibility of two-step mechanism in the LIVT process.

DOI： 10.1016/j.poly.2013.03.039

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

DOI： 10.1002/ejic.201201069

Language：English  

This chapter introduces compounds synthesized to develop new spin-crossover conductors, in which spin-crossover phenomena and conductivity coexist or interact. It also introduces spin-crossover magnets, in which spin-crossover phenomena and magnetic interaction coexist or interact. A possible route for the synthesis of multifunctional materials exhibiting spin-crossover and conductivity is the preparation of double salts, by combining spin-crossover cations/anions and conducting molecular anions/cations through electrostatic interactions. Another route is the preparation of a spin-crossover complex with a potentially conducting ligand. The preparation of spin-crossover conductors in which conductivity and light-induced excited spin state trapping (LIESST) exhibit synergistic effects is desired. Multifunctional materials exhibiting both spin-crossover and magnetic interaction are achieved by combining a spin-crossover cation/anion with an anionic/cationic magnetic framework. Another route is the incorporation of spin-crossover sites into magnetic frameworks. This edition first published 2013

DOI： 10.1002/9781118519301.ch11

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

DOI： 10.1039/c2dt31168b

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

N,N-Dipyridilaminoxyl, NOpy ₂, having a stable aminoxyl, was prepared as a new magnetic coupler for heterospin systems. Solutions of NOpy ₂ were mixed with those of bis{1,1,1,5,5,5, hexafluoro-4- (phenylimino)-2-pentanonate}cobalt derivatives, Co(hfpip-X) ₂, at a 1:1 ratio to afford the polymeric cobalt(II) complexes, [Co(hfpip-X) ₂(NOpy ₂)] _n; X = H (1), F (2), F ₃ (3), F ₅ (4), Cl (5), Cl ₃ (6), Br (7), and I (8) as single crystals. In all complexes, the local structures of the cobalt-complex units were compressed octahedra and the pyridine ligands in NOpy ₂ units coordinated to the cobalt ions in trans configuration to form linear chains for 1-4 and in cis configuration to form helical chains for 5-8. In the chains, the aminoxyl in NOpy ₂ ferromagnetically interacted with the cobalt ions to produce the ferromagnetic chains with J _intra/k _B = 9-14 K. In the magnetic susceptibility experiments of aligned sample of 6, the magnetic easy axis was determined to be the a* axis, which was the direction perpendicular to the b axis of the chain axis. The resulting chains, all except 4, interacted antiferromagnetically among each other, and especially in 1, 5, 7, and 8, the magnetic behaviors characteristic to canted two-dimensional (2D) antiferromagnets with T _c = 5.6, 4.0, 4.0, and 6.2 K, respectively, were observed. All complexes showed slow magnetic relaxations affected by the interchain antiferromagnetic interaction. The effective activation barriers, Δ _eff/k _B, for the reorientation of the magnetism for all complexes except 4 were estimated to be 25-39 K in the presence of a direct current (dc) field.

DOI： 10.1021/ic202397m

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

Charge-transfer-induced spin transition occurs cooperatively and reversibly in the isolated FeIII2CoII chains of {[Fe(pzTp)(CN)3]2Co(4-styrylpyridine)2}⋅2 H2O ⋅2 CH3OH (1). When 1 is irradiated with 532 nm light, it shows single-chain magnetic behavior with no antiferromagnetic ordering after irradiation (see picture; C gray, N blue, B yellow; LS=low spin, HS=high spin).

DOI： 10.1002/anie.201105987

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

A linear cyanido-bridged Fe2Co compound (see picture) exhibits a reversible, thermally induced cooperative charge transfer transition accompanying spin transition and polar–nonpolar transformation in the trinuclear cluster. The change in magnetic properties and polarity could also be induced by irradiation with light.

DOI： 10.1002/anie.201201305

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

Light-induced valence tautomerism (LIVT) of a dinuclear complex, [{Co(dpqa)}₂(dhbq)](PF₆)₃ (1), was investigated by ESR analysis of dhbq^3-. LIVT phenomena were observed in the sample diluted in the glass matrix as well as that in powder form. The signal decay and the relaxation were analyzed by double exponential fitting; the results suggest a two-step mechanism. Quantum mechanical tunneling was clearly observed in the glass matrix. Light-induced valence tautomerism (LIVT) of a dinuclear complex, [{Co(dpqa)}₂(dhbq)](PF₆)₃ (1), was investigated by ESR analysis of dhbq^3-. LIVT phenomena were observed in the glass matrix as well as in the powder sample. The signal decay and the relaxation, analyzed by double exponential fitting, suggest a two-step mechanism. Quantum tunneling phenomena were clearly observed in the glass matrix.

DOI： 10.1002/ejic.201100467

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

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

A novel two-dimensional mixed-metal coordination polymer, [Fe(bipe)(Au(CN)₂)₂·MeOH], composed of polyrotaxane with Fe₂(bipe)₂ loops and rigid [Au(CN)₂] ^- rods, forms a 2D → 2D parallel interpenetrating structure. The two networks are clipped by gold clusters via aurophilic interaction.

DOI： 10.1039/c0ce00376j

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

DOI： 10.1002/anie.201002881

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

DOI： 10.1021/ja908670u

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

DOI： 10.1021/ja901539y

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

DOI： 10.1021/ja808448j

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

Three cobalt(II) complexes, [Co(X) ₂(4NOpy) ₄] (X = NCO ^-, NCS ^-, and Br ^-; 4NOpy = 4-(N-tert-butylaminoxyl)-pyridine) were prepared, and their molecular structures were characterized by X-ray structure analysis. The molecular geometry of [Co(X) ₂(4NOpy) ₄] (X = NCO ^- and NCS ^-) is a compressed octahedron, in which the counter ions occupy the apical positions with short bond distances of 2.064-2.098 Å. In the crystalline state, from plots of χ _mol vs T and χ′ _mol vs T, [Co(NCO) ₂(4NOpy) ₄] and [Co(NCS) ₂(4NOpy) ₄] are antiferromagnets with T _N = 4.5 and 15 K, respectively. In frozen solution, on the other hand, both complexes and [Co(Br) ₂(4NOpy) ₄] functioned as single-molecule magnets. The χ″ _mol vs T plot for [Co(Br) ₂(4NOpy) ₄] gave a effective activation barrier (U _eff) of 20 K for the reorientation of the spin. From the field dependence of magnetization at various temperatures below 5 K for [Co(X) ₂(4NOpy) ₄] (X = NCO ^-, NCS ^-, and Br ^-) the values of the zero-field splitting parameters, D/k _B, were estimated to be -14, -9.7, and -4.5 K with S = 5/2, respectively. Theoretical studies based on the ligand-field theory model for [Co(NCO) ₂(4NOpy) ₄] gave an exchange coupling parameter, J/k _B, of 29 K and a thermodynamic activation barrier, U, of 60 K.

DOI： 10.1246/bcsj.79.1372

Event date： 2021.3

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Online   Country：Japan  

Event date： 2020.1 - 2020.2

Language：English   Presentation type：Oral presentation (general)  

Venue：Nagoya University   Country：Japan  

Dinuclear valence tautomeric(VT) complexes [(M1(cth))(M2(cth)) (-dhbq)](PF6)3 [M1 = M2 = Co; 1[1], M1 = Cr, M2 = Co; 2[2], cth = hexamethyl tetraazacyclotetradecane, dhbq = dihydroxybenzoquinone] are very promising candidates for materials exhibiting electronic ferroelectricity and pyroelectricity. The VT complexes have stimuli-responsible intramolecular electron transfers, which result switching in electronic dipoles in a molecules. The pyroelectricities of a centrosymmetric crystal of 1 and a polar crystal of 2 were investigated by temperature sweep method. Both 1 and 2 exhibited VT behaviors with T1/2 = 245 K and 360 K, respectively, in magnetic measurements. However, only 2 showed thermally-induce electric current around VT transition temperature. The contrasting results between 1 and 2 obtained in pyroelectricities are well consistent with crystalline symmetries.

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Hokkaido University   Country：Japan  

本講演では，外場応答性原子価互変異性(VT)錯体分子から得られた電子焦電特性を示す結晶についてその構築戦略と具体的な測定結果について発表する．

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学　東山キャンパス   Country：Japan  

Our chirality-assisted co-crystallization resulted pseudo-racemic solid solution of cobalt and zinc complexes as crystals. Onlythe cobalt complexes in heterometallic co-crystals, CoZn, exhibited a valence tautomerism (VT): intramolecular charge transfer. DFTcalculations revealed that complex 3 shows polarization switching behaviors due to the molecular packing with pseudo-inversion centerfor CoZn crystals.

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学　東山キャンパス   Country：Japan  

Dinuclear valence tautomeric(VT) complexes [(M1(cth))(M2(cth)) (-dhbq)](PF6)3 [M1 = M2 = Co; 1[1], M1 = Cr, M2 = Co; 2[2], M1 = Fe, M2 = Co; 3, cth = hexamethyl　tetraazacyclotetradecane, dhbq = dihydroxybenzoquinone] are very promising candidates for materials exhibiting electronic ferroelectricity and pyroelectricity. The VT complexes have stimuli-responsible intramolecular electron transfers, which result switching in electronic dipoles in a molecules. The pyroelectricities of centrosymmetric crystal of 1 and polar crystals of 2 and 3 were investigated by temperature sweep method. Both 1 and 2 exhibited VT behaviors with T1/2 = 245 K and 360 K, respectively, in magnetic measurements. However, only 2 showed thermally-induce electric current around VT transition temperature. The contrasting results between 1 and 2 obtained in pyroelectricities are well consistent with thier crystalline symmetries.

Event date： 2019.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：甲南大学　岡本キャンパス   Country：Japan  

Event date： 2018.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡国際会議場   Country：Japan  

Event date： 2018.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡国際会議場   Country：Japan  

Event date： 2017.9

Language：English   Presentation type：Oral presentation (general)  

Venue：札幌   Country：Japan  

Event date： 2017.9

Language：English  

Venue：Zao, Miyagi   Country：Japan  

Event date： 2016.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Sendai   Country：Japan  

Event date： 2015.12

Language：English   Presentation type：Oral presentation (general)  

Venue：Honolulu, Hawaii   Country：United States  

Event date： 2015.9

Language：English   Presentation type：Oral presentation (general)  

Venue：奈良女子大学   Country：Japan  

Event date： 2015.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：日本大学理工学部船橋キャンパス／薬学部   Country：Japan  

Event date： 2014.9

Language：Japanese  

Venue：中央大学、東京都   Country：Japan  

Event date： 2014.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：中央大学、東京都   Country：Japan  

今回、光学分割したキラル配位子からなる各種遷移金属単核錯体から新規異核複核錯体を合成し、これらの結晶構造及び電子物性について評価した。

Event date： 2014.7

Language：English  

Venue：Saint Petersburg   Country：Russian Federation  

Event date： 2014.6

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

本研究では、カチオン性の導電性分子としてよく知られるTTF(Tetrathiafulvalene)類縁体を用いた新規ハイブリッド分子材料を開発するため、外場感応性部位としてアニオン性SCO錯体に着目し、新規ハイブリッド化合物の合成に成功したのでその結晶構造と物性について報告する。

Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学　東山キャンパス   Country：Japan  

Event date： 2014.1

Language：English   Presentation type：Oral presentation (general)  

Venue：九州大学　西陣プラザ   Country：Japan  

Event date： 2013.12

Language：English   Presentation type：Oral presentation (general)  

Venue：TOKOホテル　東京五反田   Country：Japan  

Event date： 2013.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：琉球大学   Country：Japan  

Event date： 2013.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：愛媛大学   Country：Japan  

Photo-responsive Magnetic Properties of Valence Tautomeric Co Di-nuclear Complexes

Event date： 2013.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：立命館大学びわこ・くさつキャンパス   Country：Japan  

Structures and Magnetic Behaviors of Di-nuclear Complexes bridged by Verdazyl Radical

Event date： 2012.10

Language：English  

Venue：Orlando   Country：United States  

Event date： 2012.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：富山大学　五福キャンパス   Country：Japan  

本研究ではテトラオキソレン架橋コバルト複核錯体分子類縁体の合成を行い、これらの磁気的挙動について検討するとともに誘電特性の評価を行った。

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：神奈川   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：神奈川   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：神奈川   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：神奈川   Country：Japan  

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：神奈川   Country：Japan  

Event date： 2011.11

Presentation type：Symposium, workshop panel (public)  

Venue：名古屋   Country：Japan  

Event date： 2011.9

Presentation type：Oral presentation (general)  

Venue：岡山   Country：Japan  

Event date： 2011.9

Presentation type：Oral presentation (general)  

Venue：岡山   Country：Japan  

Event date： 2011.1

Presentation type：Symposium, workshop panel (public)  

Venue：札幌   Country：Japan  

Event date： 2010.12

Presentation type：Oral presentation (general)  

Venue：京都   Country：Japan  

Event date： 2010.9

Presentation type：Oral presentation (general)  

Venue：千葉   Country：Japan  

Event date： 2010.3

Presentation type：Oral presentation (general)  

Venue：大阪府東大阪市   Country：Japan  

Event date： 2010.3

Presentation type：Oral presentation (general)  

Venue：大阪府東大阪市   Country：Japan  

Event date： 2009.9

Presentation type：Oral presentation (general)  

Venue：長崎県長崎市   Country：Japan  

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc.