Enhanced proton conductivity in a flexible metal-organic framework promoted by single-crystal-to-single-crystal transformation.

Xi Chen, Zhongyue Zhang, Jin Chen, Sergei Sapchenko, Xue Han, Ivan Da Silva, Ming Li, Inigo Vitorica-yrzebal, George F. S. Whitehead, Chiu Chung Tang, Kunio Awaga, Sihai Yang, Martin Schroder

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Abstract

MFM-722(Pb)-DMA undergoes a single-crystal-to-single-crystal (SCSC) transformation to give MFM-722(Pb)-H2O via ligand substitution upon exposure to water vapour. In situ single crystal impedance spectroscopy reveals an increase in proton conductivity due to this structural transition, with MFM-722(Pb)-H2O showing a proton conductivity of 6.61×10-4 S cm-1 at 50 °C and 98% RH. The low activation energy (Ea = 0.21 eV) indicates that the proton conduction follows a Grotthuss mechanism.
Original languageEnglish
JournalChemical Communications
Early online date17 Nov 2020
DOIs
Publication statusE-pub ahead of print - 17 Nov 2020

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