Ruthenium(ii)-supported phosphovanadomolybdates [Ru(dmso)3PMo6V3O32]6− and [Ru(PMo6V3O32)2]14−, and their use as heterogeneous catalysts for oxidation of alcohols

Abstract

Self-assembly of cis-[RuCl₂(dmso)₄], NaVO₃, Na₂MoO₄ and NaH₂PO₄ in a molar ratio of 1 : 3 : 6 : 1 in HOAc–NaOAc buffer (pH = 4–5) in the presence of CsCl gave a ruthenium(II)-supported phosphovanadomolybdate [Ru^II(dmso)₃PMo^VI₆V^V₃O₃₂]⁶⁻ (1). While a similar reaction with the reactants in a molar ratio of 1 : 6 : 12 : 2 afforded a ruthenium substituted “sandwich” type polyoxometalate [Ru^II(PMo^VI₆^VV₃O₃₂)₂]¹⁴⁻ (2). Clusters 1 and 2 were well characterized by single-crystal X-ray diffraction. Their use as heterogeneous catalysts for oxidation of alcohols in the presence of molecular oxygen was also investigated.