Diffusion in ionic liquids: the interplay between molecular structure and dynamics

J. R. Sangoro; C. Iacob; S. Naumov; R. Valiullin; H. Rexhausen; J. Hunger; R. Buchner; V. Strehmel; J. Kärger; F. Kremer

doi:10.1039/C0SM01404D

Diffusion in ionic liquids: the interplay between molecular structure and dynamics

J. R. Sangoro,*^a C. Iacob,^a S. Naumov,^a R. Valiullin,^a H. Rexhausen,^b J. Hunger,^c R. Buchner,^c V. Strehmel,^b J. Kärger^a and F. Kremer^a

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^a Institute of Experimental Physics I, University of Leipzig, Linnéstr. 5, Leipzig, Germany
E-mail: sangoro@physik.uni-leipzig.de

^b Institute of Chemistry, Applied Polymer Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, Potsdam-Golm, Germany

^c Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitätsstr. 31, Regensburg, Germany

Abstract

Diffusion in a series of ionic liquids is investigated by a combination of Broadband Dielectric Spectroscopy (BDS) and Pulsed Field Gradient Nuclear Magnetic Resonance (PFG NMR). It is demonstrated that the mean jump lengths increase with the molecular volumes determined from quantum-chemical calculations. This provides a direct means—via Einstein–Smoluchowski relation—to determine the diffusion coefficient by BDS over more than 8 decades unambiguously and in quantitative agreement with PFG NMR measurements. New possibilities in the study of charge transport and dynamic glass transition in ionic liquids are thus opened.

Soft Matter

Diffusion in ionic liquids: the interplay between molecular structure and dynamics

Abstract

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