Turton, D.A. and Hunger, J. and Stoppa, A. and Hefter, Glenn and Thoman, A. and Walther, M. and Buchner, Richard and Wynne, K. (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.
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The authors have measured the intermol. dynamics of the 1,3-dialkylimidazolium-based room-temp. ionic liqs. (RTILs) [emim][BF4], [emim][DCA], and [bmim][DCA] at 25 °C from <1 GHz to 10 THz by ultrafast optical Kerr effect (OKE) spectroscopy and dielec. relaxation spectroscopy (DRS) augmented by time-domain terahertz and far-IR FTIR spectroscopy. This concerted approach allows a more detailed anal. to be made of the relatively featureless terahertz region, where the higher frequency diffusional modes are strongly overlapped with librations and intermol. vibrations. Of greatest interest though, is an intense low frequency (sub-α) relaxation that the authors 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 liqs.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||dynamics imidazolium ionic liq dielec relaxation optical Kerr mesoscopic aggregation imidazolium ionic liq|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||15 May 2012 13:10|
|Last Modified:||15 May 2012 13:10|