Target Syntheses of Two New Bivanadyl Capped Keggin Polyoxometalate Derivatives

Abstract

Two new bivanadyl capped Keggin polyoxometalate-based inorganic–organic hybrid compounds, [M(2,2′-bipy)2(H2O)]2[AsMo12O40(VO)2]}(M = Co 1, Zn 2; bipy = bipyridine), have been synthesized under hydrothermal conditions by directly using Li3[AsMo12O40] · nH2O as starting materials. Single crystal X-ray analysis revealed that compounds 1 and 2 were isostructural, consisting of a neutral bivanadyl capped Keggin POMs bigrafted by [M(2,2′-bipy)2(H2O)]2+ fragments. Other characterizations by elemental analysis, IR spectra, XPS spectra, power X-ray diffraction and TG analysis were also described in the paper. The study of the electrochemical properties of compounds 1 and 2 exhibit similar redox behaviors, undergoing three two-electron reversible redox processes, and the electrocatalysis of 1 has also been studied in detail.