A new {P₂W₁₈} polyoxometalate cluster modified with copper complex based on pz, 2,2–bipy, and in situ amino acid

Abstract

A new organic–inorganic hybrid compound, [{Cu₂(2,2′–bipy)₂(pz)(gly)}₂P₂W₁₈O₆₂]·H₂O (bipy = bipyridine, pz = pyrazine, gly = glycine) (1), has been hydrothermally synthesized and characterized by elemental analysis, IR, thermal gravimetric, and single- crystal X-ray diffraction. Compound 1 is an infinite one-dimensional (1-D) chain constructed from [P₂W₁₈O₆₂]⁶⁻ clusters and linker exhibiting an alternating-type structure via equatorial terminal oxygens of the polyanion. The 1-D chains are further extended into 2-D layers and 3-D supramolecular network via weak interactions. The copper complex of 1 consists of three ligands, in which an in situ glycine from pyrazine precursor was observed. Additionally, the electrochemical and electrocatalytic properties of 1 have been studied.

Keywords:

• Hydrothermal synthesis
• Wells–Dawson polyoxometalates
• In situ ligand

Acknowledgments

This work is supported by the National Natural Science Foundation of China (Grants 20671026 and 20971032), the Study Technological Innovation Project Special Foundation of Harbin (2009RFXXG202), and technological innovation team building program of college of Heilongjiang Province (2009td04) and Innovation Team Research Program of Harbin Normal University (KJTD200902).