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  • Synthesis of cis-tetrabromobispyridinemolybdates(III) and the crystal structure of ▫$cis-(NH_4)[MoBr_4py_2].1/3H_2O$▫ (py=pyridine)
    Brenčič, Jurij, 1940-2013 ; Leban, Ivan, 1947- ; Modec, Barbara
    The reaction between ▫$(NH_4)[MoBr_5 . H_2O]$▫ and pyridine in acetonitrile ▫$(CH_3CN)$▫ at room temperature results in the mixture of cis- and ▫$trans-(pyH)[MoBr_4py_2]$▫ which can be separated on ... the basis of solubility. ▫$cis-M[MoBr_4py_2] . 1/3 H_2O (M=NH_4^+, Rb^+, Cs^+), cis-(bipyH)[MoBr_4py_2]$▫ (bipy=2,2'-bipyridil) and ▫$cis-(PPh_4)[MoBr_4py_2]$▫, were prepared from ▫$cis(pyH)[MoBr_4py_2]$▫. At the temperature of boiling acetonitrile irreversible cis to trans isomerisation takes place. Bromine oxydizes cis isomers at room temperature to ▫$trans-MoBr_4py_2$▫. The compounds were characterized by chemical analysis, infrared, UV-VIS spectroscopy, conductivity measurements and powder diffraction. The crystal structure of ▫$cis-(NH_4)[MoBr_4py_2]. 1/3 H_2O$▫ has been determinated: rhomobohedral, R3c, (No.161), a=15.809(3) Å, ▫$\alpha=112.79(2)°, Z=6, D_c-2.29, D_0=2.27(3) g/cm^3, V=2601(1)Å, R_1-0.046,R_w-0.068$▫. Average Mo-Br and Mo-N-pyridine) distances within the anion are 2,5892) and 2.20(2) Å. ▫$cis-Rb[MoBr_4py_2].1/3 H_2O and cis-Cs[MoBr_4py_2].1/3H_2O$▫ are isostructural with ▫$cis-(NH_4)[MoBr_4py_2[.1/3H_2O$▫
    Vir: Zeitschrift für anorganische und allgemeine Chemie = journal of inorganic and general chemistry. - ISSN 0044-2313 (620, 1994, str. 950-954)
    Vrsta gradiva - članek, sestavni del
    Leto - 1993
    Jezik - angleški
    COBISS.SI-ID - 17909509

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