Issue 1, 2021

Proton conduction in hydronium solvate ionic liquids affected by ligand shape

Abstract

We investigated the ligand dependence of the proton conduction of hydronium solvate ionic liquids (ILs), consisting of a hydronium ion (H3O+), polyether ligands, and a bis[(trifluoromethyl)sulfonyl]amide anion (Tf2Nāˆ’; Tf = CF3SO2). The ligands were changed from previously reported 18-crown-6 (18C6) to other cyclic or acyclic polyethers, namely, dicyclohexano-18-crown-6 (Dh18C6), benzo-18-crown-6 (B18C6) and pentaethylene glycol dimethyl ether (G5). Pulsed-field gradient spin echo nuclear magnetic resonance results revealed that the protons of H3O+ move faster than those of cyclic 18C6-based ligands but as fast as those of acyclic G5 ligands. Based on these results and density functional theory calculations, we propose that the coordination of a cyclic ether ligand to the H3O+ ion is essential for fast proton conduction in hydronium solvate ILs. Our results attract special interest for many electro- and bio-chemical applications such as electrolyte systems for fuel cells and artificial ion channels for biological cells.

Graphical abstract: Proton conduction in hydronium solvate ionic liquids affected by ligand shape

Supplementary files

Article information

Article type
Paper
Submitted
23 Sep 2020
Accepted
02 Dec 2020
First published
08 Dec 2020

Phys. Chem. Chem. Phys., 2021,23, 449-456

Proton conduction in hydronium solvate ionic liquids affected by ligand shape

K. Kawata, A. Kitada, N. Tsuchida, M. Saimura, T. Nagata, M. Katahira, K. Fukami and K. Murase, Phys. Chem. Chem. Phys., 2021, 23, 449 DOI: 10.1039/D0CP05025C

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