Stoppa, A. and Hunger, J. and Buchner, Richard and Hefter, Glenn and Thoman, A. and Helm, H. (2008) Interactions and Dynamics in Ionic Liquids. Journal of Physical Chemistry B 112 (16), pp. 4854-4858.
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Precise dielec. spectra were detd. at 25° over the exceptionally broad frequency range of 0.1 ≤ ν/GHz ≤ 3000 for the imidazolium-based room-temp. ionic liqs. (RTILs) [bmim][BF4], [bmim][PF6], [bmim][DCA], and [hmim][BF4]. The spectra are dominated by a low-frequency process at ∼1 GHz with a broad relaxation time distribution of the Cole-Davidson or Cole-Cole type, which is thought to correspond to the rotational diffusion of the dipolar cations. These RTILs possess two Debye relaxations at ∼5 GHz and ∼0.6 THz and a damped harmonic oscillation at ∼2.5 THz. The two higher-frequency modes are almost certainly due to cation librations, but the origin of the ∼5 GHz mode remains obscure.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||solute ionic liq intermol dynamics interaction solvation|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||08 Jun 2012 10:36|
|Last Modified:||08 Jun 2012 10:36|