The synthesis and characterization of a new butterfly-like polyoxometalate: K5Na2[Mo9V3O38]·9H2O

A new butterfly-like compound K5Na2[Mo9V3O38]·9H2O 1 has been synthesized in aqueous solution and characterized by elemental analysis, IR spectroscopy, TG analysis, UV–vis spectroscopy, X-ray photoelectron spectroscopy (XPS), cyclic voltammogram and single-crystal X-ray diffraction analysis. Compound 1 is a new butterfly-like molybdodivanadate composed by Mo (VI) and V (V) with the Mo/V ratio 3:1, the polyoxoanion [Mo9V3O38 ]7− can be described as two {MMo4O18} (M = Mo/V) units connected by one {V2O8} core. The photocatalyst property of compound 1 has been investigated, which shows a good photocatalyst for degradation of RhB.