A highly nuclear vanadium-containing tungstobismutate: synthesis and crystal structure of K11H[(BiW9O33)3Bi6(OH)3(H2O)3V4O10]·25 H2O

A novel and large heteropolyanion [(BiW9O33)3Bi6(OH)3(H2O)3V4O10]12− has been synthesized by reaction of sodium metavanadate with Na9[BiW9O33]·16H2O in acetate buffer solutions (at pH 4.8). The present anion has a trilobal structure in which three α-B {BiW9O33} units are connected to each other by an unique core [Bi6(OH)3(H2O)3V4O10]15+. A central bismutate/vanadate-mixed core comprises three sets of two types of the BiO6 pentagonal pyramid, the edge-sharing VO5 square-pyramidal triad, and a VO4 tetrahedron.