Structure and dynamics in protic ionic liquids: a combined optical Kerr-effect and dielectric relaxation spectroscopy study

Turton, D.A., Sonnleitner, T., Ortner, A., Walther, M., Hefter, G., Seddon, K.R., Stana, S., Plechkova, N.V., Buchner, R. and Wynne, K. (2012) Structure and dynamics in protic ionic liquids: a combined optical Kerr-effect and dielectric relaxation spectroscopy study. Faraday Discussions, 154, pp. 145-153. (doi: 10.1039/c1fd00054c)

Abstract

The structure and dynamics of ionic liquids (ILs) are unusual due to the strong interactions between the ions and counter ions. These microscopic properties determine the bulk transport properties critical to applications of ILs such as advanced fuel cells. The terahertz dynamics and slower relaxations of simple alkylammonium nitrate protic ionic liquids (PILs) are here studied using femtosecond optical Kerr-effect spectroscopy, dielectric relaxation spectroscopy, and terahertz time-domain spectroscopy. The observed dynamics give insight into more general liquid behaviour while comparison with glass-forming liquids reveals an underlying power-law decay and relaxation rates suggest supramolecular structure and nanoscale segregation.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Turton, Dr David and Wynne, Professor Klaas
• Authors: Turton, D.A., Sonnleitner, T., Ortner, A., Walther, M., Hefter, G., Seddon, K.R., Stana, S., Plechkova, N.V., Buchner, R., and Wynne, K.
• Subjects: Q Science > QD Chemistry
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: Faraday Discussions
• Publisher: Royal Society of Chemistry
• ISSN: 1359-6640
• ISSN (Online): 1364-5498
• Published Online: 14 July 2011
• Copyright Holders: Copyright © 2012 The Royal Society of Chemistry
• First Published: First published in Faraday Discussions 154:145-153
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
55907	1	Two-dimensional terahertz/IR spectroscopy: a unique probe of ultrafast hydrogen-bond dynamics of liquid water and model systems.	Klaas Wynne	Engineering & Physical Sciences Research Council (EPSRC)	EP/F06926X/1	CHEM - CHEMISTRY
57134	1	Liquid-liquid transitions in molecular liquids: from supramolecular structure to phase separation	Klaas Wynne	Engineering & Physical Sciences Research Council (EPSRC)	EP/J004790/1	CHEM - CHEMISTRY
56356	1	Terahertz spectroscopy of aqueous ionic solutions to understand the role of hydrogen-bond network breaking and strengthening in the Hofmeister	Klaas Wynne	Engineering & Physical Sciences Research Council (EPSRC)	EP/E046541/1	CHEM - CHEMISTRY