OXOFLUORO COMPLEXES OF QUINQUEVALENT MOLYBDENUM

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Abstract
A large number of stable salts of the general formulae M2[MoOF5] (M = K, Rb and Cs), (BH)2[MoOF5] (B = hydroxyl amine, guanidine, 2,6-lutidine, α-naphthyl amine, anthranilic acid, m-amino benzoic acid and quinaldinic acid) and B′H2[MoOF5] (B′ = ethylene diamine) have been prepared by crystallising solutions of MoO(OH)3 and the alkali metal fluorides or the bases in 40% HF. The potassium salt has also been prepared by two other methods. The molecular conductances of the salts of the types M2[MoOF5] and (BH)2[MoOF5] in water indicate that they are unibivalent type of electrolytes. The magnetic moments of the salts fall within the range of 1.51 to 1.76 BM indicating the presence of Mo(V) in them. The i.r. spectra of the salts show strong (Mo = O) bands between 980–900 cm−1. Digestion of the ethylene diamine and 2,6-lutidine salts with ethanol gave the insoluble light pink and yellow brown complexes MoOF3(En) and MoOF3(Lut) respectively. Relatively low magnetic moments of these complexes suggest polymerisation through oxide bridge.

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