Synthesis, Characterization and Crystal Structure of the Water-Soluble, All-Inorganic Composition, A, β-Keggin Triniobium(V)-Substituted Polyoxotungstate

Triniobium(V)-substituted β-Keggin polyoxotungstate, K7[A, β-SiW9Nb3O40]·6H2O, as a soluble metal-oxide analogue and a metal-oxide support of the polyoxoanion-supported organometallic complexes, was synthesized, and the crystal and molecular structures of this polyoxoanion containing the Keggin A, β-SiW9 unit were successfully determined for the first time.