Pentadecavanadate, V15O429–, a new highly condensed fully oxidized isopolyvanadate with kinetic stability in water

Abstract

The X-ray structure of the new fully oxidized isopolyvanadate, (TMA)₃H₆V^V₁₅O₄₂·2.5H₂O 1(TMA = tetramethyl-ammonium), prepared by reaction of H₂O₂ with VOSO₄·4H₂O shows a bicapped Keggin structure with four-, five- and six-coordinate vanadium atoms; ⁵¹V NMR indicates that the same structure has considerable kinetic stability in water at ca. pH 3.5 but is thermodynamically unstable with respect to the conventional V^V₁₀O₂₈^6– structure.