Synthesis and structure of an octanuclear oxothiomolybdenum(V) wheel with bridging hydrazine ligands encapsulating a central MoVIO4 tetrahedron, [MoV8S8O8(OH)7(N2H4)2MoVIO4]−

Reaction of hydrazine with the octanuclear mixed valence oxothioanion [MoV8S8O8(OH)8{HMoVIO5(H2O)}]3− has afforded the octanuclear anion [MoV8S8O8(OH)7(N2H4)2{MoVIO4}]− as potassium salt. Its structure has been established by X-ray crystallography, showing that four of the hydroxo bridges have been replaced by μ2-N2H4 ligands. Concomitantly the coordination of the central MoVI atom has changed from octahedral to tetrahedral. In the solid, the anionic rings are attached to double chains of potassium ions.