Abstract
A one-dimensional (1-D) organic–inorganic hybrid compound {(H3O)[CuI(4,4′-bipy)]3[SiW12O40]} · 1.5H2O (1) has been synthesized from hydrothermal reaction of Keggin polyoxometalate, cupric nitrate and 4,4′-bipyridine (4,4′-bipy). Single crystal X-ray diffraction shows 1-D zigzag chains built up of saturated Keggin polyoxoanions and infinite [CuI(4,4′-bipy)] n n + units. Zipper-like arrangement of adjacent zigzag chains by hydrogen-bonding interactions leads to a 2-D layer and π–π interactions of 4,4′-bipy ligands from adjacent layers further result in the 3-D structure of 1. All Cu atoms in 1 are three-coordinated with “T-type” geometries, indicating they are univalent in the resultant compound. This result has further been confirmed by the absence of signal in the EPR spectrum of 1.
Acknowledgments
This work was supported by the National Science Foundation of China (Grant No. 20571014), the Program for New Century Excellent Talents in University (NCET-07-0169), and the Analysis and Testing Foundation of Northeast Normal University.