Phonon-like hydrogen-bond modes in protic ionic liquids

Reichenbach, J., Ruddell, S. A., González-Jiménez, M. , Lemes, J., Turton, D. A., France, D. J. and Wynne, K. (2017) Phonon-like hydrogen-bond modes in protic ionic liquids. Journal of the American Chemical Society, 139(21), pp. 7160-7163. (doi:10.1021/jacs.7b03036) (PMID:28511538)

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Abstract

Gigahertz- to terahertz-frequency infrared and Raman spectra contain a wealth of information concerning the structure, intermolecular forces, and dynamics of ionic liquids. However, these spectra generally have a large number of contributions ranging from slow diffusional modes to underdamped librations and intramolecular vibrational modes. This makes it difficult to isolate effects such as the role of Coulombic and hydrogen-bonding interactions. We have applied far-infrared and ultrafast optical Kerr effect spectroscopies on carefully selected ions with a greater or lesser degree of symmetry in order to isolate spectral signals of interest. This has allowed us to demonstrate the presence of longitudinal and transverse optical phonon modes and a great similarity of alkylammonium-based protic ionic liquids to liquid water. The data show that such phonon modes will be present in all ionic liquids, requiring a reinterpretation of their spectra.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:France, Dr David and Turton, Dr David and Gonzalez Jimenez, Dr Mario and Ruddell, Mr Stuart and Wynne, Professor Klaas and Reichenbach, Miss Judith
Authors: Reichenbach, J., Ruddell, S. A., González-Jiménez, M., Lemes, J., Turton, D. A., France, D. J., and Wynne, K.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Journal of the American Chemical Society
Publisher:American Chemical Society
ISSN:0002-7863
ISSN (Online):1520-5126
Published Online:16 May 2017
Copyright Holders:Copyright © 2017 American Chemical Society
First Published:First published in Journal of the American Chemical Society 139(21): 7160-7163
Publisher Policy:Reproduced under a Creative Commons License
Data DOI:10.5525/gla.researchdata.404

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