A 3-D inorganic–organic hybrid based on saturated Wells–Dawson polyoxoanion and K⁺, linked by an Ag–Ag bond

Abstract

A 3-D complex K₂[Ag₂(biim)₂]₂P₂W₁₈O₆₂ (biim = biimidazole) (1) has been hydrothermally synthesized and characterized by IR, thermogravimetric, and single-crystal X-ray diffraction. Single-crystal X-ray structural analysis reveals that 1 exhibits a 1-D wavelike chain constructed from µ₃-bridging oxygen atoms of [P₂W₁₈O₆₂]⁶⁻ and [Ag₂(biim)₂]²⁺. The K⁺ link to six oxygen atoms of three P₂W₁₈ clusters and 12 equatorial terminal oxygen atoms of P₂W₁₈ clusters link to six K⁺, resulting in a 3-D framework with a relatively short Ag–Ag bond [2.836 Å]. The electrochemical behavior of 1 modified carbon paste electrode (1-CPE) has been studied. The results indicate that 1-CPE has remarkable stability.

Keywords:

• Hydrothermal synthesis
• Ag–Ag bond
• Wells–Dawson polyoxometalates
• 3-D

Acknowledgments

This work is supported by the National Natural Science Foundation of China (grant nos 20671026, 20971032), the Study Technological Innovation Project Special Foundation of Harbin (grant no. 2009RFXG202), The Technological innovation team building program of college of Heilongjiang Province (2009td04), and Innovation Team Research Program of Harbin Normal University (KJTD200902).