Bis(trimethyl-phenyl-ammonium) µ-oxalato-bis-[oxidodiperoxido-molybdate(VI)].

A trimethyl-phenyl-ammonium salt of a dinuclear µ-oxalate complex of diperoxidomonomolybdate units, (C9H14N)2[Mo2(C2O4)(O2)4O2], was obtained from an acidic aqueous solution; the dianion is located about a centre of inversion. Each Mo atom bears two peroxide groups together with one O atom from the oxalate group in its equatorial positions and one terminal O atom as well as another O atom from the oxalate in axial positions. The oxalate group acts as a tetra-dentate bridging ligand and bridges between the diperoxidomolybdate units.