Self-Condensation of [MoV2O2S2]2+ with Phosphate or Arsenate Ions by Acid–Base Processes in Aqueous Solution: Syntheses, Crystal Structures, and Reactivity of [(HXO4)4Mo6S6O6(OH)3]5−, X=P, As

A promising route to new functionalized compounds could be provided by two new heteropolyoxothio anions resulting from self−condensation of the [Mo2S2O2]2+ building unit with arsenate or phosphate ions. There is 31P NMR evidence (illustrated) that the three peripheral PO4 or AsO4 groups in the products are labile.