Turton, David A. and Hunger, Johannes and Stoppa, Alexander and Hefter, Glenn and Thoman, Andreas and Walther, Markus and Buchner, Richard and Wynne, Klaas (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,
Full text not available from this repository. (Request a copy)Abstract
We have measured the intermolecular dynamics of the 1,3-dialkylimidazolium-based room-temperature ionic liquids (RTILs) [emim][BF(4)], [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 |
|---|---|
| Uncontrolled Keywords: | EFFECT OHD-OKE; INTERMOLECULAR DYNAMICS; TEMPERATURE-DEPENDENCE; NANOSTRUCTURAL ORGANIZATION; PHYSICAL-PROPERTIES; MOLECULAR-DYNAMICS; GLASS-TRANSITION; SPECTROSCOPY; SOLVATION; CHLORIDE; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 09 Sep 2020 09:45 |
| Last Modified: | 09 Sep 2020 09:45 |
| URI: | https://pred.uni-regensburg.de/id/eprint/28570 |
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