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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

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Abstract

A one-pot hydrothermal approach has been developed to introduce tetraethylene glycol (TEG) molecules into a two-dimensional (2D) layered lanthanide metal–organic framework ([Sm(H5C2P2O7)(H2O)2]·Guest, denoted SmHEDP-Guest). Through the straightforward loading of TEG, the proton conductivity of SmHEDP-TEG (1.21 × 10−3 S cm−1) is increased by 3 orders of magnitude compared with its analogue SmHEDP-H2O (1.22 × 10−6 S cm−1) under 100% relative humidity at room temperature. More excitingly, SmHEDP-TEG exhibits very high proton conductivity of 9.17 × 10−2 S cm−1, even higher than commercial Nafion, when the temperature is increased to 333 K, which is significantly higher than SmHEDP-H2O (3.38 × 10−5 S cm−1). The single crystal XRD reveals that the adjacent water molecules located in the channels of SmHEDP-H2O are isolated without hydrogen bonding interactions owing to their long distances. However, interestingly, the guest TEG molecules of SmHEDP-TEG behave as hydrogen bonded connected bridges, which switch on the proton transport pathway to promote proton hopping. This discovery may provide a facile strategy to design and synthesize more promising candidates for novel proton conductors.

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

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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, Advance Article
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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, Advance Article , DOI: 10.1039/C8DT01350K

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