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Issue 19, 2020
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Proton conduction in two Cu/Zn dimer-based hydrogen-bonded supramolecular frameworks from imidazole multi-carboxylate

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Abstract

To date, the research on hydrogen-bonded supramolecular frameworks (HSFs) has been extremely limited. Herein, by hydrothermal reactions of CuCl2·2H2O or Zn(Ac)2·2H2O with 2-(o-carboxylic)phenyl-4,5-imidazole dicarboxylic acid (o-CPH4IDC), two dimer-based HSFs, [Cu2(o-CPH2IDC)2(phen)2]·3H2O (phen = 1,10-phenanthroline) (1) and [Zn2(o-CPH2IDC)2(2,2-bipy)2]·0.5H2O (2,2′-bipy = 2,2′-bipyridine) (2) were assembled and characterized. The two HSFs demonstrated temperature- and humidity-dependent proton conductive properties. Moreover, at 98% RH and 100 °C, the highest σ values of 3.13 × 10−4 S cm−1 for 1 and 0.55 × 10−4 S cm−1 for 2 can be attained, which can be compared to the values of reported HSFs. Moreover, the proton transfer mechanisms of the two HSFs were highlighted. Obviously, the existence of free –COOH units and H-bonds in the frameworks is responsible for the proton transport. Our research will provide useful guidance for the design of proton conductive H-bonded materials.

Graphical abstract: Proton conduction in two Cu/Zn dimer-based hydrogen-bonded supramolecular frameworks from imidazole multi-carboxylate

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Supplementary files

Article information


Submitted
09 Mar 2020
Accepted
23 Apr 2020
First published
24 Apr 2020

New J. Chem., 2020,44, 8098-8105
Article type
Paper

Proton conduction in two Cu/Zn dimer-based hydrogen-bonded supramolecular frameworks from imidazole multi-carboxylate

Q. Wang, Z. Ye, G. Shi, K. Guo and G. Li, New J. Chem., 2020, 44, 8098
DOI: 10.1039/D0NJ01189D

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