A5019208508- Magnetism in coordination complexes
- Organic and Molecular Conductors Research
- Solid-state spectroscopy and crystallography
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Organometallic Compounds Synthesis and Characterization
- Molecular spectroscopy and chirality
- Advanced Condensed Matter Physics
- Magnetic Properties and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Physics and Applications
- Electric Motor Design and Analysis
- Semiconductor materials and devices
- Axial and Atropisomeric Chirality Synthesis
- Nonlinear Optical Materials Research
- Metal complexes synthesis and properties
- Magnetic and transport properties of perovskites and related materials
- Phosphorus compounds and reactions
- Synthetic Organic Chemistry Methods
- Carbohydrate Chemistry and Synthesis
- Electron and X-Ray Spectroscopy Techniques
- Elevator Systems and Control
- Magnetic Properties of Alloys
- Hydrogen embrittlement and corrosion behaviors in metals
Tohoku University
2008-2022
Toyota Industries (Japan)
2009-2020
Kyoto University
1991-2019
Toho University
2017
Hatch (Canada)
2003-2010
Gifu University
2006-2008
Shizuoka University
2004-2007
Département de Chimie Moléculaire
2007
Université Joseph Fourier
2007
Centre National de la Recherche Scientifique
2007
An air- and moisture-stable nickel(II) complex of bis-carbene pincer 2 has been synthesized, its catalytic activity for the Heck reaction Suzuki coupling was investigated.
θ-(BEDT-TTF) 2 RbZn(SCN) 4 is a two-dimensional organic conductor exhibiting metal–insulator transition at T MI =200 K. This insulating charge ordered state below was investigated by single crystal structural analysis taking account of the superlattice formation . A large displacement (about 0.2 Å) BEDT-TTF molecules associated with found. Transfer integrals between were also calculated from data. The net transfer above modulated into quasi one-dimensional integral chain ionicities are...
A family of tridendate ligands 1 a-e, based on the 2-aryl-4,6-di(2-pyridyl)-s-triazine motif, was prepared along with their hetero- and homoleptic Ru(II) complexes 2 a-e ([Ru(tpy)(1 a-e)](2+); tpy=2,2':6',2"-terpyridine) 3 ([(Ru(1 a-e)(2)](2+)), respectively. The were characterized by (1)H NMR spectroscopy, ES-MS, elemental analysis. Single-crystal X-ray analysis a e demonstrated that triazine core is nearly coplanar non-coordinating ring, dihedral angles 1.2 18.6 degrees, redox behavior...
The Ginzburg-Landau coherence lengths are determined from the temperature dependence of magnetization by fitting measured results with renormalization theory fluctuation developed for layered superconductors. derived interlayer 6±2 Å and 3.2±0.5 κ-(BEDT-TTF) 2 Cu[N(CN) ]Br Cu(NCS) , respectively, which remarkably shorter than spacing. It is also found that these virtually unaffected isotope substitution in BEDT-TTF molecules.
Ru(II) polypyridine species have been assembled about dirhodium(II, II) tetracarboxylate cores. The complexes prepared general formulas [{(terpy)Ru(La)}n{Rh2(CH3COO)4-n(CH3CN)2}]2n+ (a-type compounds: terpy = 2,2':6',2' '-terpyridine; La 4'-(p-carboxyphenyl)-2,2':6',2' n 1, 1a; 2, cis-2a and trans-2a-cis trans refer to the arrangement of around dirhodium core; 3, 3a), [{(Lb)Ru(La)}n{Rh2(CH3COO)4-n(CH3CN)2}]2n+ (b-type Lb 6-phenyl-2,4-di(2-pyridyl)-s-triazine; 1b; an inseparable mixture...
A band structure calculation based on the X-ray analysis reveals that pressure raises quasi one-dimensionality of Fermi surface title compound. 2 k F lattice modulation is observed with a wave vector q 3 ′ =(2/3 0 0.29) at 10.7 kbar and room temperature. This first observation pressure-induced CDW. With cooling, changes from to commensurate 1/3) below 240 K. On other hand, ambient 20 K where resistivity begins increase rapidly, three-dimensional short range ordering occurs for weak diffuse...
A 1:1 adduct of phenazine (Phz) with chloranilic acid (H2ca) and bromanilic (H2ba), in which nonpolar neutral molecules are connected by the intermolecular O−H···N hydrogen bonds, shows ferroelectric transitions. Neutron diffraction analysis these materials reveals that there two inequivalent hydrogen-bonding sites below transition temperature (253 K for Phz-H2ca 168 Phz-H2ba). This asymmetry was also observed maximum entropy method (MEM) synchrotron X-ray diffractions. The structure results...
Magnetic and structural phase diagram in a spinel-type solid solution system Fe1 − xMnxCr2O4 has been investigated. The cubic-to-tetragonal transition temperature Ts 1 is gradually reduced by the substitution of Mn2 + (3d5) for Jahn–Teller-active Fe2 (3d6) ions, implying long-range nature ferroic interaction between orbitals. In paramagnetic tetragonal x < 0.5, c parameter shorter than because anharmonicity elastic energy. crystal structure further changes to orthorhombic at around...
Abstract Similar to the first quantum spin liquid (QSL) candidate, κ-(ET)2Cu2(CN)3 (1), newly prepared κ-(ET)2Ag2(CN)3 (2) is a dimer Mott insulator with QSL ground state at ambient pressure and exhibits metallic superconducting states next under pressure, where ET bis(ethylenedithio)tetrathiafulvalene. The packing of dimer, which corresponds single site (S = 1/2), in 2 similar that 1. Salt afforded two-dimensional equilateral triangular lattice having strong geometrical frustration (t′/t...
Charge ordering (CO) is a phenomenon in which electrons solids crystallize into periodic pattern of charge-rich and charge-poor sites owing to strong electron correlations. This usually results long-range order. In geometrically frustrated systems, however, glassy electronic state without CO has been observed. We found that charge-ordered organic material with an isosceles triangular lattice shows charge dynamics associated crystallization vitrification electrons, can be understood the...
It has been believed for a long time that the metal-to-insulator (MI) transition of ${\mathrm{BaVS}}_{3}$ is not accompanied by any spatial order spin and lattice. We have carried out x-ray-diffraction measurements single crystals using laboratory x-ray source as well synchrotron radiation, found superlattice reflections which double lattice constant c exist below temperature. The most probable space group at low-temperature insulator phase contains two inequivalent vanadium sites, thus...
The crystal structure of θ-(BEDT-TTF) 2 RbCo(SCN) 4 in its insulating state below T MI (approximately 200 K) was investigated by X-ray diffraction experiments. transfer integrals between the BEDT-TTF molecules were also calculated from structural data, and ionicities estimated intramolecular bond length distribution. A large modulation charge disproportionation found. ratio 0 to +0.2:+0.8 +1.0. These results compared with thoes analogous salt RbZn(SCN) .
Helical aromatics (1) were synthesized via one step in good quantity by solvent-free condensation of N,N'-p-phenylenediamine (2) and various carboxylic acids the presence a Lewis acid. Microwave irradiation greatly facilitated reaction to furnish 1 with 100% diastereo- 50% enantioselectivity, when chiral acid was utilized. 1f, derived from 2-methylglutaric acid, quite stable, no racemization taking place even at 200 degrees C. The assignment absolute configurations helical has been achieved...
Simultaneous synchrotron radiation and transport measurements for the organic thyristor family compound θ-(BEDT-TTF) 2 RbZn(SCN) 4 have revealed presence of microscopic competing domains between twofold 3 ×4 charge orderings in a triangular lattice. In contrast to conventional correlated electron systems, ordering is unique critical parameter phase competition. With external current, only melts, which responsible emergence nonlinear response.
The dielectric material with an isolated hydrogen-bond, 5-bromo-9-hydroxyphenalenon, was studied by means of neutron and X-ray diffractions in the temperature range between 300 10 K. Analyses on nuclear electron density distributions revealed a discrepancy two hydrogen atom hydrogen-bond region, leading to local electronic dipole moment . Both least-square structure analysis distribution maximum entropy method confirmed that occupies equivalent sites near center through whole range, even at...
We have measured and analyzed the resistivity voltage–current characteristics of charge-ordered organic salt θ-(BEDT-TTF) 2 Cs M (SCN) 4 ( =Zn, Co, Co 0.7 Zn 0.3 ). At 4.3 K, all samples show giant nonlinear conduction, in which c -axis markedly decreases with external current by a factor 10 against small electric field 1 V/cm. The temperature dependence is well described an activation law, energy evaluated to be meV low-current limit, linearly current. x-ray intensity near q =(0, k ,1/2)...
A new single-crystal neutron diffractometer based on a large-area curved two-dimensional position-sensitive detector (C-2DPSD) has been developed. The commissioning is almost complete, together with development of the measurement methodology and raw data processing software package, Reciprocal Analyzer, instrument now ready to be launched for users. Position decoding C-2DPSD via delay-line readout method an effective angular range 110 × 54° in horizontal vertical directions, respectively,...
We report on the temperature and magnetic-field dependence of dielectric constant ${\ensuremath{\epsilon}}_{1}^{c}$ conductivity ${\ensuremath{\sigma}}_{1}^{c}$ along $c$ axis in antiferromagnetic insulating (AFM-I) state $\ensuremath{\lambda}\text{\ensuremath{-}}{(\mathrm{BEDT}\text{\ensuremath{-}}\mathrm{TSF})}_{2}\mathrm{Fe}{\mathrm{Cl}}_{4}$, which indicate some ordering coexistence with AFM-I. There appears a sharp upturn saturated electric polarizations colossal magnetodielectricity...