Issue 27, 2018

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 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

Supplementary files

Article information

Article type
Paper
Submitted
07 Apr 2018
Accepted
13 Jun 2018
First published
13 Jun 2018

Dalton Trans., 2018,47, 9096-9102

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, 47, 9096 DOI: 10.1039/C8DT01350K

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