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

Turton, D.A. and Hunger, J. and Stoppa, A. and Hefter, G. and Thoman, A. and Walther, M. and Buchner, R. and Wynne, K., U.K. Engineering and Physical Sciences Research Council (EPSRC) (Funder), Deutsche Forschungsgemeinschaft (Funder) (2009) Dynamics of imidazolium ionic liquids from a combined dielectric relaxation and optical kerr effect study: evidence for mesoscopic aggregation. Journal of the American Chemical Society, 131 (31). pp. 11140-11146. ISSN 0002-7863 (http://dx.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 degrees 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-alpha) 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.

  • Item type:Article
    ID code:19016
    Dates:
    Date
    Event
    12 August 2009
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Strathprints Administrator
    Date deposited:24 May 2010 09:28
    Last modified:08 Apr 2024 17:55
    URI:https://strathprints.strath.ac.uk/id/eprint/19016
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