Polyoxovanadium–Organophosphonates—Properties and Structure of an Unusual Pentavanadate Species with a VO Group Directed Toward the Interior of the Molecular Cavity

An unsymmetrical bowllike [V3O5(PhPO3)4] framework (V2–V4, P1–P4), on whose surface a VO unit (V1) is “condensed”, and which is capped by octahedrally coordinated V atom (V5), is formed by the anion of 1 · CH3OH. A terminal oxo group (O23) is encapsulated in this cavity (phenyl substituents at P1, P3, P4 are omitted from the structure shown right).