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 J. Vitorica-Yrezabal; George Whitehead; Chiu C. Tang; Kunio Awaga; Sihai Yang; Martin Schröder

doi:10.1039/D0CC05270A

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

Xi Chen,^a Zhongyue Zhang,*^b Jin Chen,^a Sergei Sapchenko,^a Xue Han,^a Ivan da-Silva,

^c Ming Li,

^d Inigo J. Vitorica-Yrezabal,^a George Whitehead,

^a Chiu C. Tang,^e Kunio Awaga,

^b Sihai Yang

*^a and Martin Schröder

*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, University of Manchester, Manchester, UK
E-mail: Sihai.Yang@manchester.ac.uk, M.Schroder@manchester.ac.uk

^b Department of Chemistry, Nagoya University, Furocho, Chikusa, Nagoya, Japan
E-mail: zhang.zhongyue@i.mbox.nagoya-u.ac.jp

^c ISIS Pulsed Neutron and Muon Source, Rutherford Appleton Laboratory, Oxfordshire OX11 0QX, UK

^d Faculty of Engineering, University of Nottingham, Nottingham, UK

^e Diamond Light Source, Harwell Science Campus, Oxfordshire, UK

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 (E_a = 0.21 eV) indicates that the proton conduction follows a Grotthuss mechanism.

This article is part of the themed collection: Functional Coordination Networks

Chemical Communications

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

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

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