Synthesis and Electrochemical Properties of a New 1D Organic–Inorganic Hybrid Compound Based on Keggin-Type Heteropolyanions and Isopolyanions Decorated by Transition Metal Fragments

摘要

A new chain-like organic–inorganic hybrid compound composed of the heteropolyanions and isopolyanions, [{CuII(2,2′-bpy)}6(MoVMoVI 5O22)] [PMoVI 12O40] · H2O 1 (bpy = 2,2′-bipyridine) has been hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy, TG analysis, XPS spectrum and single-crystal X-ray diffraction. Crystal data for compound 1: monoclinic, space group P 2(1)/c, a = 13.9382(14) ?, b = 20.0300(19) ?, c = 17.1757(17) ?, β = 94.054(2)°, V = 4783.2(8) ?3, Z = 2. The Keggin-heteropolyanion [PMo12O40]3? and the Cu-supporting isopolyanion [{Cu(2,2′-bpy)}6(Mo6O22)]3+ building units are bridged through the O–Cu–O bridges into 1D infinite chain. Note that, the [{Cu(2,2′-bpy)}6(Mo6O22)]3+ unit, which contains a rarely reported isopolyanion [Mo6O22]9? decorated by six [Cu(2,2′-bpy)] fragments. Furthermore, the electrochemical behavior of a 1-modified carbon paste electrode (1-CPE) and its electrocatalytic reduction of nitrite were investigated.