Molybdenum-Tungsten Mixed-Metal Trinuclear Clusters with Two Capping Oxides and Six Bridging Acetates,and Other Mixed Molybdenum-Tungsten Clusters

Abstract

Mixed molybdenum-tungsten clusters of di-, tri-, tetra- and pentavalent metal ions are reviewed. Those having strong π-accepting and/or sgrave]-donating ligands such as CO are not included. The complexes which have been prepared by the authors' group are described in more detail. These are trinuclear complexes (Mo_nW_3-n(μ₃-O)₂(μ-CH₃COO)₆(H₂O)₃]²⁺) with the oxidation state four and dinuclear complex (MoW(μ-O)₂-(O)₂(μ-N, N'-edta)]^2-) with the oxidation state five. Other complexes described are dinuclear complexes of divalent metal ions (‘Mo-W quadruple bond’) and of trivalent metal ions (“Mo-W triple bond”), and trinuclear complexes with i-propoxide ligands.