Journal
CHEMICAL PHYSICS LETTERS
Volume 439, Issue 4-6, Pages 323-326Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2007.03.084
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We have used H-2 magnetic relaxation to study the single-particle reorientation of the 1-ethyl-3-methylimidazolium ([emim](+)) ion in two prototypical low-viscosity ionic liquids comprising the bis(trifluoromethylsulfonyl)imide ([Tf2N](-)) and dicyanimide ([(CN)(2)N](-)) anions. Hydrodynamic analysis reveals extremely low ('subslip') coupling factors not captured by existing theories. Comparison with the microwave dielectric spectrum of [emim][Tf2N] shows that the dominant diffusive component of the dielectric response can be rationalized by single-particle reorientation of the cations. (C) 2007 Elsevier B.V. All rights reserved.
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