Target Syntheses of Two New Bivanadyl Capped Keggin Polyoxometalate Derivatives

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 Li-3[AsMo12O40] center dot nH(2)O 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.