Souhei Kaneko

The University of Tokyo, Edo, Tōkyō, Japan

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Publications (7)18.22 Total impact

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    ABSTRACT: In the title complex, {[Cu3[W(CN)8]2(C5H6N2)4(H2O)2]·2H2O} n , the coordination polyhedron of the eight-coordinated W(V) atom is a bicapped trigonal prism, in which five CN groups are bridged to Cu(II) ions, and the other three CN groups are terminally bound. Two of the Cu(II) ions lie on a centre of inversion and each of the three independent Cu(II) cations is pseudo-octahedrally coordinated. In the crystal structure, cyanido-bridged-Cu-W-Cu layers are linked by pillars involving the third independent Cu(II) ion, generating a three-dimensional network with non-coordinating water mol-ecules and 5-methyl-pyrimidine mol-ecules. O-H⋯O and O-H⋯N hydrogen bonds involve the coordinating and non-coordin-ating water mol-ecules, the CN groups and the 5-methyl-pyrimidine mol-ecules.
    Acta Crystallographica Section E Structure Reports Online 02/2014; 70(Pt 2):m47-8. · 0.35 Impact Factor
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    ABSTRACT: The crystal structure, magnetic properties, and temperature- and photoinduced phase transition of [{CoII(4-methylpyridine)(pyrimidine)}2{CoII(H2O)2}{WV(CN)8}2]·4H2O are described. In this compound, a temperature-induced phase transition from the CoII (S = 3/2)-NC-WV(S = 1/2) [high-temperature (HT)] phase to the CoIII(S = 0)-NC-WIV(S = 0) [low temperature (LT)] phase is observed due to a charge-transfer-induced spin transition. When the LT phase is irradiated with 785 nm light, ferromagnetism with a high Curie temperature (TC) of 48 K and a gigantic magnetic coercive field (Hc) of 27 000 Oe are observed. These TC and Hc values are the highest in photoinduced magnetization systems. The LT phase is optically converted to the photoinduced phase, which has a similar valence state as the HT phase due to the optically induced charge-transfer-induced spin transition.
    Advanced Functional Materials 05/2012; 22(10). · 10.44 Impact Factor
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    ABSTRACT: Two-dimensional (2-D) cyano-bridged Cu–W bimetallic assemblies that include halogen-substituted pyridine molecules, [CuII(3-iodopyridine)4][CuII(3-iodopyridine)2]2[WV(CN)8]2 (1) (triclinic crystal structure, P1̅ space group), [CuII(3-bromopyridine)4][CuII(3-bromopyridine)2]2[WV(CN)8]2 (2) (triclinic, P1̅), and [CuII(3-chloropyridine)2(H2O)2][CuII(3-chloropyridine)2]2[WV(CN)8]2·4H2O (3) (monoclinic, P21/c), were synthesized. Thermogravimetric measurements demonstrate that 1 and 2 have high thermal durability up to ca. 150 °C (423 K) due to the lack of water molecules in the crystal and the stacked Cu–W 2-D layers with halogen bonding between halogen-substituted pyridine and the cyano nitrogen of octacyanotungstate. In contrast, 3 exhibits weight loss above ca. 50 °C (323 K) as the water molecules between the 2-D layers are removed upon heating. Magnetic measurements show that 1–3 are ferromagnets due to parallel ordering of the magnetic spins on CuII (S = 1/2) and WV (S = 1/2) with Curie temperatures (TC) of 4.7 K (1), 5.2 K (2), and 7.2 K (3).
    Crystal Growth & Design 11/2011; 11(12):5561–5566. · 4.69 Impact Factor
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    ABSTRACT: In the polymeric title compound, [Cu(3)W(2)(CN)(16)(C(7)H(6)N(2))(6)(H(2)O)](n), the coordination geometry of the W(V) atom is eight-coordinate dodeca-hedral, where four CN groups of [W(CN)(8)] are bridged to Cu(II) ions, and the other four CN groups are not bridged. The coordination geometries of the Cu(II) ions are five-coordinate pseudo-square-based pyramidal. There are two distinct Cu sites, which build and link the cyanido-bridged Cu-W ladder chains. Successive connections lead to the formation of a two-dimensional network. The H atoms of a coordinated water molecule and the imino groups form hydrogen bonds to the N atoms of non-bridged CN groups.
    Acta Crystallographica Section E Structure Reports Online 01/2010; 66(Pt 4):m403-4. · 0.35 Impact Factor
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    ABSTRACT: Cu3[W(CN)8]2(pyrimidine)2(3-cyanopyridine)2·4H2O, a cyanide-bridged copper(II) octacyanotungstate(V) with two types of organic ligands (pyrimidine and 3-cyanopyridine), is prepared. In this compound, the coordination geometry of W is an 8-coordinated bicapped trigonal prism where five CN groups of [W(CN)8] are bridged to five Cu ions, and the remaining three CN groups are free. The coordination geometries of the three types of Cu ions (Cu1, Cu2, and Cu3) are 6-coordinated pseudo-octahedron. The cyano-bridged-Cu2–W–Cu3-layer is linked by a Cu1 pillar unit, and a cavity along the a axis, which is occupied by 3-cyanopyridine molecules and zeolitic water molecules, exists. The present compound shows ferrimagnetism with a Currie temperature of 7K, a saturation magnetization of 2.9μB, and a coercive field of 7Oe at 2K.
    Polyhedron 01/2009; 28(9):1893-1897. · 2.05 Impact Factor
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    ABSTRACT: In the polymeric title compound, {[Cu(3)W(2)(CN)(16)(C(4)H(4)N(2))(2)(C(6)H(4)N(2))(2)(H(2)O)(2)]·2H(2)O}(n), the coordination geometry of W is an eight-coordinated bicapped trigonal prism. Five of the CN groups of [W(CN)(8)] are bridged to Cu ions. The coordination geometries of the Cu atoms are each pseudo-octa-hedral; one Cu atom is located on a centre of inversion. The cyano-bridged W-Cu layers are linked by Cu-containing pillars, to form a three-dimensional network with cavities occupied by noncoordinated water and 4-cyano-pyridine mol-ecules.
    Acta Crystallographica Section E Structure Reports Online 01/2008; 64(Pt 11):m1442-3. · 0.35 Impact Factor
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    ABSTRACT: X-ray crystal structural analysis indicates that a cyano-bridged Cu–W bimetallic assembly, CsICuII[WV(CN)8]·0.5H2O, consists of a two-dimensional (2D) double-layered structure, where CsI penetrates between the anionic double-layers. This compound exhibits spontaneous magnetization below a magnetic critical temperature of 40K and metamagnetic behaviors such as an anomalous magnetization drop below 30K and a spin–flip transition at 90Oe. Calculations based on a magnetic dipole–dipole interaction indicate that the magnetic spins of the antiferromagnetic and ferromagnetic configurations are oriented along the c-axis in the bc plane. The calculated energy difference between these two configurations almost corresponds to the energy of the magnetic field of the spin–flip transition.
    Chemical Physics Letters - CHEM PHYS LETT. 01/2007; 446(4):292-296.