Temperature Dependence of the Primary Relaxation in 1-Hexyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}imide

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Details zur Publikation

Autorinnen und Autoren: Russina O, Beiner M, Papas C, Russina M, Arrighi V, Unruh T, Mullan CL, Hardacre C, Triolo A
Zeitschrift: Journal of Physical Chemistry B
Jahr der Veröffentlichung: 2009
Band: 113
Heftnummer: 25
Seitenbereich: 8469-8474
ISSN: 1520-6106
eISSN: 1520-5207


We present results from complementary characterizations of the primary relaxation rate of a room temperature ionic liquid (RTIL), 1-hexyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl} imide, [C(6)mim][Tf(2)N], over a wide temperature range. This extensive data set is successfully merged with existing literature data for conductivity, viscosity, and NMR diffusion coefficients thus providing, for the case of RTILs, a unique description of the primary process relaxation map over more than 12 decades in relaxation rate and between 185 and 430 K. This unique data set allows a detailed characterization of the VTF parameters for the primary process, that are: B = 890 K, T(0) = 155.2 K, leading to a fragility index m = 71, corresponding to an intermediate fragility. For the first time neutron spin echo data from a fully deuteriated sample of RTIL at the two main interference peaks, Q = 0.76 and 1.4 angstrom(-1) are presented. At high temperature (T > 250 K), the collective structural relaxation rate follows the viscosity behavior; however at lower temperatures it deviates from the viscosity behavior, indicating the existence of a faster process.

FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Unruh, Tobias Prof. Dr.
Professur für Nanomaterialcharakterisierung (Streumethoden)

Einrichtungen weiterer Autorinnen und Autoren

Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
Heriot-Watt University
Martin-Luther-Universität Halle-Wittenberg (MLU)
Queen's University


Russina, O., Beiner, M., Papas, C., Russina, M., Arrighi, V., Unruh, T.,... Triolo, A. (2009). Temperature Dependence of the Primary Relaxation in 1-Hexyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}imide. Journal of Physical Chemistry B, 113(25), 8469-8474. https://dx.doi.org/10.1021/jp900142m

Russina, Olga, et al. "Temperature Dependence of the Primary Relaxation in 1-Hexyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}imide." Journal of Physical Chemistry B 113.25 (2009): 8469-8474.


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