[AS^<scp>V</scp>VVO₄₀]^7⊖, a Topologically Interesting, Mixed Valence Cluster as Model for Vanadium Minerals Formed by Weathering

Abstract

A surprisingly low VIV/VV ratio is present in the cluster anion of 1. Its structure (picture right; V black, As shaded, O open circles) may be described as a {AsV12O38} unit with Oh symmetry. It is formed from twelve VO6 octahedra sharing edges, which each also share a face with the central AsO6 octahedron. Two additional VO groups cap the AsO6 octahedron.