期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 114, 期 1, 页码 382-386出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp908519u
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资金
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1191]
Charge transport and dipolar relaxations in a series of imidazolium-based ionic liquids are Studied by means of broadband dielectric spectroscopy. Despite the shift of more than 5 decades in the dielectric spectra upon systematic variation of the anion, scaling with respect to the dc conductivities and the characteristic rates yields a collapsing plot. The dielectric spectra are described at higher frequencies in terms of dipolar relaxations whereas hopping conduction in a random spatially varying energy landscape is quantitatively shown to dominate the spectra at lower frequencies, The beta-relaxations observed for both the precursor and the ionic liquids are assigned to librational motion of the imidazolium ring. The corresponding dielectric strength exhibits a strong dependence oil the anion.
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