Mixed-metal oxide-based solids composed of a linked array of a plurality of vanadium oxide building blocks wherein a vanadium and oxygen shell cluster encapsulate a central X unit, where X is at... Show moreMixed-metal oxide-based solids composed of a linked array of a plurality of vanadium oxide building blocks wherein a vanadium and oxygen shell cluster encapsulate a central X unit, where X is at least one species selected from the group consisting of VO.sub.4, SO.sub.4, Cl, Br, I, H.sub.2 O, HCOO and NO.sub.2 and associated methods of synthesis are provided. Show less