Souhei Kaneko

The University of Tokyo, Tokyo, Tokyo-to, Japan

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Publications (5)2.85 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: 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. · 1.81 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.