Sangoro, Joshua and Iacob, Ciprian and Serghei, A. and Naumov, S. and Galvosas, P. and Kärger, J. and Buchner, Richard and Wespe, C. and Bordusa, F. and Stoppa, A. and Hunger, J. and Kremer, Friedrich (2008) Electrical conductivity and translational diffusion in the 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid. Journal of Chemical Physics 128 (21), 214509/1-214509/5.
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Broadband dielec. and terahertz spectroscopy (10-2-10+12 Hz) are combined with pulsed field gradient NMR (PFG-NMR) to explore charge transport and translational diffusion in the 1-butyl-3-methylimidazolium tetrafluoroborate ionic liq. The dielec. spectra are interpreted as superposition of high-frequency relaxation processes assocd. with dipolar librations and a cond. contribution. The latter originates from hopping of charge carriers on a random spatially varying potential landscape and quant. fits the obsd. frequency and temp. dependence of the spectra. A further anal. delivers the hopping rate and enables one to deduce-using the Einstein-Smoluchowski equation-the translational diffusion coeff. of the charge carriers in quant. agreement with PFG-NMR measurements. By that, the mobility is detd. and sepd. from the charge carrier d.; for the former, a Vogel-Fulcher-Tammann and for the latter, an Arrhenius temp. dependence is obtained. There is no indication of a mode arising from the reorientation of stable ion pairs. (c) 2008 American Institute of Physics
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||imidazolium fluoroborate ionic liq cond diffusion|
|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 10:37|
|Last Modified:||08 Jun 2012 10:37|