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  • 1
    ISSN: 0044-2313
    Keywords: Cobalt Complexes ; Pyrazine ; Gel Crystallization ; Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Growth and Structure of CoSO4 · Pyrazine · 6 H2O (I) and (CoSO4)2 · Pyrazine · 12 H2O (II)Single crystals of μ-pyrazino-bis[pentaquacobalt(II)]-sulfate-dihydrate CoSO4(pz) · 6 H2O and Tetraqua-μ-pyrazino-cobalt(II)sulfate-dihydrate (CoSO4)2(pz) · 12 H2O were grown by using gel methods and investigated by X-ray analysis. CoSO4(pz) · 6 H2O (I) shows monoclinic symmetry, space group C2/c; a = 1006.4(4) pm, b = 1026.9(4) pm, c = 1261.5(2) pm; β = 104.01(4)°; Z = 4. (CoSO4)2(pz) · 12 H2O (II) shows orthorhombic symmetry, space group Pbam; a = 1262.3(4) pm, b = 1231.3(4) pm, c = 684.1(2) pm; Z = 2. CoSO4 and Pyrazine crystallize in a polymeric (I) as well as in a dimeric (II) compound. In the polymeric compound the molecules are bonded by pyrazine to form alternating linear chains. The dimer is a dinuclear complex with a bridging pyrazine molecule.
    Notes: μ-Pyrazino-bis[pentaquacobalt(II)]sulfatdihydrat (CoSO4 · Pyrazin · 6 H2O) und Tetraqua-μ-pyrazino-cobalt(II)sulfat-dihydrat ((CoSO4)2 · Pyrazin · 12 H2O) wurden mittels der Gelmethode synthetisiert und röntgenographisch untersucht. CoSO4 · Pz · 6 H2O (I) kristallisiert monoklin, Raumgruppe C2/c, a = 1006,4(4) pm, b = 1026,9(4) pm, c = 1261,5(2) pm; β = 104,01(4)°; Z = 4. (CoSO4)2 · Pz · 12 H2O (II) kristallisiert orthorhombisch, Raumgruppe Pbam, a = 1262,3(4) pm, b = 1231,3(4) pm, c = 684,1(2) pm; Z = 2. Zwischen CoSO4 und Pyrazin läßt sich neben einer polymeren (I) auch eine dimere Verbindung (II) kristallisieren. Der polymeren Verbindung liegen lineare, in ihrer Richtung alternierende Ketten zugrunde. Das Dimere liegt als pyrazinverbrückter Zweikernkomplex vor.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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