Dynamics of imidazolium ionic liquids from a combined dielectric relaxation and optical Kerr effect study: Evidence for mesoscopic aggregation

D.A Turton; J. Huger; A. Stoppa; G. Hefter; A. Thoman; M. Walther; R. Buchner; K. Wynne

doi:10.1021/ja903315v

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Dynamics of imidazolium ionic liquids from a combined dielectric relaxation and optical Kerr effect study: Evidence for mesoscopic aggregation

Journal article

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Dynamics of imidazolium ionic liquids from a combined dielectric relaxation and optical Kerr effect study: Evidence for mesoscopic aggregation

D.A Turton, J. Huger, A. Stoppa, G. Hefter, A. Thoman, M. Walther, R. Buchner and K. Wynne

Journal of the American Chemical Society, Vol.131(31), pp.11140-11146

2009

DOI: https://doi.org/10.1021/ja903315v

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Abstract

We have measured the intermolecular dynamics of the 1,3-dialkylimidazolium- based room-temperature ionic liquids (RTILs) [emim][BF4], [emim][DCA], and [bmim][DCA] at 25°C from below 1 GHz to 10 THz by ultrafast optical Kerr effect (OKE) spectroscopy and dielectric relaxation spectroscopy (DRS) augmented by time-domain terahertz and far-infrared FTIR spectroscopy. This concerted approach allows a more detailed analysis to be made of the relatively featureless terahertz region, where the higher frequency diffusional modes are strongly overlapped with librations and intermolecular vibrations. Of greatest interest though, is an intense low frequency (sub-α) relaxation that we show is in accordance with recent simulations that have reported mesoscopic structure arising from aggregates or clusters - structure that explains the anomalous and inconveniently high viscosities of these liquids.

Details

Title: Dynamics of imidazolium ionic liquids from a combined dielectric relaxation and optical Kerr effect study: Evidence for mesoscopic aggregation
Authors/Creators: D.A Turton (Author/Creator)
J. Huger (Author/Creator)
A. Stoppa (Author/Creator)
G. Hefter (Author/Creator)
A. Thoman (Author/Creator)
M. Walther (Author/Creator)
R. Buchner (Author/Creator)
K. Wynne (Author/Creator)
Publication Details: Journal of the American Chemical Society, Vol.131(31), pp.11140-11146
Publisher: American Chemical Society
Number of pages: 7
Identifiers: 991005540050707891
Murdoch Affiliation: School of Chemical and Mathematical Science
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.89 Ionic, Molecular & Complex Liquids; 2.89.508 Ionic Liquids
Web Of Science research areas: Chemistry, Multidisciplinary
ESI research areas: Chemistry