Synthesis and characterization of a polyoxotungstate-supported metal compound [{Cu(enMe)2(H2O)}{Cu(enMe)2}3P2W18O62] · nH2O

Abstract A new polyoxotungstate formed by Wells–Dawson clusters and copper(II) complexes, [{Cu(enMe) 2 (H 2 O)}{Cu(enMe) 2 } 3 P 2 W 18 O 62 ] ·  n H 2 O (enMe = 1,2-diaminopropane, n  = 0.81) has been synthesized under hydrothermal conditions. Single-crystal X-ray diffraction revealed that one terminal and three bridging oxygen atoms of the Wells–Dawson cluster in the title compound are coordinated to copper(II) atoms, and forming a unique tetrasupporting polyoxometalate structure. Its cyclic voltammetric behavior in aqueous electrolyte demonstrated that its modified carbon paste electrode has a good stability. It was exhibited that the compound has catalytic activity in epoxidation of maleic anhydride.