Unprecedented rearrangement of molybdenum(VI) oxide to (μ2-oxido)bis[dioxidomolybdenum(VI)] hexamolybdate

yMoO(2)(acac)2 reacts with water, amides, sulfoxides, and phosphane oxides in aqueous methanol, under mild conditions, to afford a new family of molybdates of composition [Mo2O5L6]-[Mo6O1]9 (L = H2O, dimethylformamide, dimethylacetamide, dimethyl sulfoxide, dibutyl sulfoxide, tributylphosphane oxide, triphenylphosphane oxide, hexamethylphosphoramide). The crystal and molecular structures of the two first structurally characterized (mu(2)-oxido)bis[dioxidomolybdenum(VI)] hexamolybdates were established by X-ray diffraction analysis.