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Switching on the proton transport pathway of a lanthanide metal-organic framework by one-pot loading of tetraethylene glycol for high proton conduction

Abstract

A one-pot hydrothermal approach has been developed to introduce the tetraethylene glycol (TEG) molecules into a two-dimensional (2-D) layered lanthanide metal-organic framework ([Sm(H5C2P2O7)(H2O)2]· Guest, denoted as SmHEDP-Guest). By straightforward loading of TEG, the proton conductivity of SmHEDP-TEG (1.21×10-3 S/cm) is increased by 3 orders of magnitude compared with its analogue SmHEDP-H2O (1.22×10-6 S/cm) under 100% RH at room temperature. More excitingly, SmHEDP-TEG exhibits very high proton conductivity of 9.17×10-2 S/cm even as commercial Nafion when the temperature increased to 333K, which is significant higher than SmHEDP-H2O (3.38×10-5 S/cm). The single crystal XRD reveals that the adjacent water molecules located in the channels of SmHEDP-H2O are isolated without hydrogen-bonding interaction owing to their long distances, however, interestingly, the guest TEG molecules of SmHEDP-TEG behave as hydrogen-bonding connected bridges, which switch on the proton transport pathway to promote the proton hopping. This discovery may provide a facile strategy to design and synthesize more promising candidates for the novel proton conductors.

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Publication details

The article was received on 07 Apr 2018, accepted on 13 Jun 2018 and first published on 13 Jun 2018


Article type: Paper
DOI: 10.1039/C8DT01350K
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Switching on the proton transport pathway of a lanthanide metal-organic framework by one-pot loading of tetraethylene glycol for high proton conduction

    X. Wang, D. Lou, X. Lu, J. Wu, Y. Mu, Y. Yan, Q. Zhang and M. Bai, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT01350K

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