Organically Functionalized Mixed-Valent Polyoxo-30-molybdate Wheel and Neutral Tetramolybdenum(V) Oxo Cluster.

The first organofunctionalized mixed-valent polyoxo-30-molybdate wheel, [MoMoO{AsO(CH)}] (), was synthesized in aqueous, mildly acidic conditions, and upon further acidification, the neutral tetramolybdenum(V) oxo cluster [MoO{AsO(CH)}] () was obtained. Single-crystal X-ray diffraction (XRD) revealed that comprises 18 Mo and 12 Mo ions arranged in a cyclic fashion with alternating {Mo} and {Mo} groups, which are capped by 18 dimethylarsinate ligands, resulting in a novel polyoxo-30-molybdate wheel with a central cavity of ∼1.5 nm.