Anomalous dynamic behavior of ions and water molecules in dilute aqueous solution of 1-butyl-3-methylimidazolium bromide studied by NMR
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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DOI：
10.1016/j.cplett.2006.06.052
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发表时间：
2006-08-18
影响因子：
2.8
通讯作者：
Nishikawa, Keiko
中科院分区：
文献类型：
--
作者：
Nakakoshi, Masamichi;Ishihara, Shinji;Nishikawa, Keiko
用NMR研究了溴化1-丁基-3-甲基咪唑（[bmim]Br）在D2 O中的动力学性质。用脉冲场梯度法分别测定了[bmim]（除以）和HDO的扩散系数。根据Br-~（81）-NMR信号的半宽估计了Br-的动力学。结果表明，一个异常的动力学，特别是[bmim]（除以），是明显的，在下面的区域类似于0.1 M（0.0019的[bmim]Br的摩尔分数）。对于[bmim]（除以）和HDO，最大值出现在对浓度绘制的扩散系数曲线中。在该组成下，Br-的弛豫时间T-2显示出斜率的突变。这些调查结果的可能解释。(c)2006 Elsevier B. V.保留所有权利。
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.