[(S2)2Mo(S2)2Mo(S2)2]2−, a Novel Complex Containing Only S Ligands and a MoMo Bond

Mo-S compounds occur in redox enzymes whose action involves electron transfer MoVI⇌MoV. In this context, interest attaches to the new complex (1), which is formed on reduction of molybdate(VI) by polysulfide ions in aqueous solution. In (1), Mo has the unusual coordination number 9.