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

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• 作者：Masamichi Nakakoshi ; Shinji Ishihara ; Hiroaki Utsumi ; Hiroko Seki ; Yoshikata Koga and Keiko Nishikawa
• 刊名：Chemical Physics Letters
• 出版年：2006
• 期刊代码：7_00092614
• 类别：ph
• 出版时间：18 August 2006
• 卷：427
• 期：1-3
• 页码：87-90
• 文件大小：233 K

摘要

Dynamic properties of 1-butyl-3-methylimidazolium bromide ([bmim]Br) in D₂O were investigated by NMR. The diffusion coefficients of [bmim]⁺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 ⁸¹Br-NMR. The results indicate that an anomalous dynamics, especially for [bmim]⁺, is evident in the region below 0.1 M (0.0019 in the mole fraction of [bmim]Br). For [bmim]⁺ and HDO, maxima appeared in the curves of the diffusion coefficients plotted against the concentration. The relaxation time, T₂, for Br⁻ showed a break in slope at this composition. Probable interpretations on these findings are presented.