Preparation and Electrochemistry Properties of a New Polyoxometalate-Based Supramolecular Assembly

A polyoxometalate-based supramolecular assembly with the formula (Hcpy)(6)H-2[PMo12O40] (1) [cpy = 4-(5-chloropyridin-2-yl)pyridine] was prepared and characterized. Noncovalent intermolecular interactions including hydrogen bonds (N-H center dot center dot center dot O-Mo, N-H center dot center dot center dot H-N, and C-H center dot center dot center dot O-Mo), halogen (C-Cl center dot center dot center dot O-Mo), and face-to-face pi packing co-exist in crystal 1, which serves the insolubility of 1 in aqueous solution. Compound 1 was used as a solid material to fabricate a bulk-modified carbon paste electrode by direct mixing. Electrochemistry results indicated that 1 is possessed of electrocatalytic activities toward the reduction reactions of chlorate, hydrogen peroxide, and nitrite.