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A supramolecular complex based on poly-Keggin-anion chains: synthesis, structure characterization, and conductivity

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Abstract

A proton-conductive supramolecular complex, {[Cu(H2O)8][H(H2O)3](HINO)4(PMo12O40)} n , was constructed by a self-assembly of H+(H2O)3 clusters, [Cu(H2O)8]2+ clusters, [PMo12O40]3− anions, and isonicotinic acid N-oxide (HINO). Single-crystal X-ray diffraction analysis at 293 K revealed that the complex presented the three-dimensional (3D) supramolecular framework built from non-covalent interactions. Interestingly, [PMo12O40]3− anions self-assembled into poly-Keggin-anion chains in the supramolecular framework. Thermogravimetric analysis shows no weight loss in the temperature range of 20–100 °C, indicating that all water molecules in the unit structure are not easily lost below 100 °C. Surprisingly, the proton conductivity of the complex in the temperature range of 85–100 °C under 98% RH condition reached good proton conductivity of 10−3 S cm−1. A possible mechanism of the proton conduction was proposed according to the experimental results.

Graphical Abstract

A good proton-conductive supramolecular complex was built from non-covalent interactions among HINO molecules, [Cu(H2O)8]2+ and H+(H2O)3 clusters, and [PMo12O40]3− anions, as well as its structure was determined by using single-crystal X-ray diffraction data.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (no. 20971038), the Natural Science Foundation of the Education Department of Henan Province (no. 2009A150015), and the Science Foundation for Youths of Henan Normal University (2008qk10).

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Authors and Affiliations

  1. College of Chemistry and Environmental Science, Henan Normal University, Xinxiang, 453007, China

    Mei-Lin Wei, Hui-Hua Li, Xiao-Xiang Wang & Jun-Hua Wang

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  1. Mei-Lin Wei
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  2. Hui-Hua Li
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  4. Jun-Hua Wang
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Correspondence to Mei-Lin Wei.

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Wei, ML., Li, HH., Wang, XX. et al. A supramolecular complex based on poly-Keggin-anion chains: synthesis, structure characterization, and conductivity. Struct Chem 23, 129–136 (2012). https://doi.org/10.1007/s11224-011-9790-3

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