Structural and catalytic performance of a polyoxometalate-based hybrid compound

Abstract

By introducing long rigid ligands into polyoxometalate (POM) systems, a new POM-based hybrid compound with CDS topology, {[Cu(bpe)]2(H2SiMo12O40)}·(bpe)·2H2O (1) (bpe = bis(4-pyridyl)ethylene), has been hydrothermally synthesized and characterized by physical methods. Single-crystal X-ray diffraction analysis shows that the ladder-like 1-D structure of 1 is formed from Keggin clusters modified by the wavy ([Cu(bpe)]n) chains. Compound 1 contains two types of tunnels along the a axis and the [1–10] axis, which are occupied by isolated bpe molecules. Compound 1 bulk-modified carbon paste electrode (1-CPE) displays good electrocatalytic activity toward the reduction of nitrite and bromate, and photocatalytic activities indicate that 1 presents good degradation activity and may be a photocatalyst to decompose some organic dyes.