ChemInform Abstract: (As4Mo6V7O39(SO4))4-: A Species with an Unusual Structure and a Model for the Different Host-Guest Properties of Poly-vanadates and - molybdates.
Abstract
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ChemInform Abstract
Blue-violet crystals of the novel compound (NMe4)4(As4Mo6V7O39(SO4)). times.H2O are prepared in 87.7% yield (based on V) by reaction of a solution of (NH4)6(Mo7O24)×4 H2O, NH4VO3, As2O3, NH4SCN and Me4NCl in H2O/DMF in the presence of hydrazinium sulfate and H2SO4. The compound crystallizes in the monoclinic space group P21/n with Z = 4. The unusual structure of the inclusion type anion consisting of a shell in which an SO2- 4 ion is incorporated is described. In this structure for the first time V and MO atoms compete with one another in the presence of a sulfate ion as central unit. The compound can serve as model for studies of the different host-guest properties or carcerand functions of poly-vanadates and -molybdates.
