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Anomalous dynamic behavior of ions and water molecules in dilute aqueous solution of 1-butyl-3-methylimidazolium bromide studied by NMR

TitleAnomalous dynamic behavior of ions and water molecules in dilute aqueous solution of 1-butyl-3-methylimidazolium bromide studied by NMR
Publication TypeJournal Article
Year of Publication2006
AuthorsNakakoshi, M, Ishihara, S, Utsumi, H, Seki, H, Koga, Y, Nishikawa, K
JournalChemical Physics Letters
Volume427
Pagination87-90
Date PublishedAug
Type of ArticleArticle
ISBN Number0009-2614
Keywords1-PROPANOL, DIFFUSION, ELECTROLYTES, H2O, LIQUIDS, MIXTURES, SOLVENTS, SPECTROSCOPY
Abstract

Dynamic properties of 1-butyl-3-methylimidazolium bromide ([bmim]Br) in D2O were investigated by NMR. The diffusion coefficients of [bmim](divided by)and HDO were determined separately by the pulse field gradient method. The dynamics of Br- was estimated by the half-widths of the signals of Br-81-NMR. The results indicate that an anomalous dynamics, especially for [bmim](divided by), is evident in the region below similar to 0.1 M (0.0019 in the mole fraction of [bmim]Br). For [bmim](divided by) and HDO, maxima appeared in the curves of the diffusion coefficients plotted against the concentration. The relaxation time, T-2, for Br- showed a break in slope at this composition. Probable interpretations on these findings are presented. (c) 2006 Elsevier B.V. All rights reserved.

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