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Title: A Hydronium Solvate Ionic Liquid: Ligand Exchange Conduction Driven by Labile Solvation
Authors: Kitada, Atsushi  kyouindb  KAKEN_id  orcid (unconfirmed)
Kintsu, Kohei
Takeoka, Shun
Fukami, Kazuhiro  kyouindb  KAKEN_id  orcid (unconfirmed)
Saimura, Masayuki
Nagata, Takashi  kyouindb  KAKEN_id  orcid (unconfirmed)
Katahira, Masato  kyouindb  KAKEN_id  orcid (unconfirmed)
Murase, Kuniaki  kyouindb  KAKEN_id  orcid (unconfirmed)
Author's alias: 北田, 敦
近都, 康平
竹岡, 駿
深見, 一弘
才村, 正幸 /永田, 崇
片平, 正人
邑瀬, 邦明
Keywords: Hopping Conduction
Hydronium Solvate Ionic Liquid
Labile Solvation
Issue Date: 2018
Publisher: The Electrochemical Society
Journal title: Journal of the Electrochemical Society
Volume: 165
Issue: 9
Start page: H496
End page: H499
Abstract: We observed a new class of proton conduction in a hydronium (H₃O⁺) solvate ionic liquid (IL). The IL is described as [H₃O⁺·18C6]Tf₂N⁻; Tf = CF₃SO₂) anion. Self-diffusion coefficient measurements revealed that protons of H₃O⁺ (solute ion) move faster than 18C6 ligand (solvent), marking the first observation of ligand exchange conduction not only among solvate ILs but also among protic ILs without free neutral molecules. The presence of ligand exchange conduction without inducing external electric field indicates that solvation of H₃O⁺ by 18C6 is kinetically labile, i.e. ligand exchange is very fast for the reaction H₂O + 18C6 + HTf₂N ⇌ H₃O⁺·18C6]Tf₂N, while the equilibrium shifts to the right. The fundamental findings regarding the hydronium solvate IL will help in the design of proton conductors.
Rights: © The Author(s) 2018. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY,, which permits unrestricted reuse of the work in any medium, provided the original work is properly cited.
DOI(Published Version): 10.1149/2.0971809jes
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