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Water-mediated proton conduction in two stable fluorophenyl imidazole dicarboxylate-based cadmium(II) complexes

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Abstract

Recently, crystalline solid materials as proton conductors have attracted intensive attention. Herein, two highly stable complexes, 2D coordination polymer [Cd(3,5-DFPhH2IDC)2]·H2O (1) and supramolecule [Cd(3,5-DFPhH2IDC)2(phen)(H2O)]·0.5H2O (2) (phen = 1,10-phenanthroline), have been synthesized by using 2-(3,5-difluorophenyl)imidazole-4,5-dicarboxylic acid (3,5-DFPhH3IDC) as organic ligand. The water-assisted proton-conductive properties of 1 and 2 were investigated by impedance spectroscopy. Notably, the proton conductivity of both complexes attains the optimized value of 4.90 × 10−5 S cm−1 for 1 and 2.04 × 10−4 S cm−1 for 2 under 100 °C and 98% RH. Consequently, their proton-conducting mechanisms based on the Ea values were highlighted.

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Funding

We gratefully acknowledge the financial support by the National Natural Science Foundation of China (21571156 and J1210060).

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Authors and Affiliations

  1. College of Chemistry and Green Catalysis Center, Zhengzhou University, Zhengzhou, 450001, Henan, People’s Republic of China

    Bingxue Han, Hao Chen, Yuanyuan Zhao & Gang Li

  2. School of Science, North University of China, Taiyuan, 030051, Shanxi, People’s Republic of China

    Yaru Liu

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  1. Bingxue Han
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  2. Hao Chen
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  3. Yuanyuan Zhao
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  4. Yaru Liu
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Correspondence to Gang Li.

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Han, B., Chen, H., Zhao, Y. et al. Water-mediated proton conduction in two stable fluorophenyl imidazole dicarboxylate-based cadmium(II) complexes. Transit Met Chem 45, 267–278 (2020). https://doi.org/10.1007/s11243-020-00378-9

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  • DOI: https://doi.org/10.1007/s11243-020-00378-9

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