Interactions and dynamics in ionic liquids

Stoppa, Alexander; Hunger, Johannes; Buchner, Richard; Hefter, Glenn; Thoman, Andreas; Helm, Hanspeter

doi:10.1021/jp800852z

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Interactions and dynamics in ionic liquids

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Stoppa, A., Hunger, J., Buchner, R., Hefter, G., Thoman, A., & Helm, H. (2008). Interactions and dynamics in ionic liquids. The Journal of Physical Chemistry B, 112(16), 4854-4858. doi:10.1021/jp800852z.

Cite as: https://hdl.handle.net/21.11116/0000-0004-F88F-4

Abstract

Precise dielectric spectra have been determined at 25 degrees C over the exceptionally broad frequency range of 0.1 <}or= nu/GHz {<or= 3000 for the imidazolium-based room-temperature ionic liquids (RTILs) [bmim][BF4], [bmim][PF6], [bmim][DCA], and [hmim][BF4]. The spectra are dominated by a low-frequency process at approximately 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. In addition, these RTILs possess two Debye relaxations at approximately 5 GHz and approximately 0.6 THz and a damped harmonic oscillation at approximately 2.5 THz. The two higher-frequency modes are almost certainly due to cation librations, but the origin of the approximately 5 GHz mode remains obscure.