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Issue 5, 1993
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Low-temperature syntheses of vanadium(III) and molybdenum(IV) bromides by halide exchange

Abstract

Halide-exchange reactions of VCl4 or MoCl5 with dry HBr at temperatures between ca.–50 and +20 °C afforded the corresponding bromides, VBr3 or MoBr4′, in good yields, presumably via the formation of unstable higher-valent bromide intermediates which undergo spontaneous loss of bromine. In corresponding reactions with Hl the exchange was incomplete and mixed halides were obtained. At room temperature the VCl4–Hl system gave VCl3 in an almost quantitative yield. By reaction of MoBr4 with tetrahydrofuran (thf)[MoBr3(thf)3] was isolated and its crystal structure determined: orthorhombic, space group Pbcn(no. 60), a= 8.812(2), b= 13.882(5), c= 14.279(3)Å, Z= 4, R= 0.063. The molecule has the usual meridional geometry, typical of other [MoX3(thf)3] derivatives (X = Cl or l).

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Article type: Paper
DOI: 10.1039/DT9930000655
Citation: J. Chem. Soc., Dalton Trans., 1993,0, 655-658
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    Low-temperature syntheses of vanadium(III) and molybdenum(IV) bromides by halide exchange

    F. Calderazzo, C. Maichle-Mössmer, G. Pampaloni and J. Strähle, J. Chem. Soc., Dalton Trans., 1993, 0, 655
    DOI: 10.1039/DT9930000655

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