Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India.
J Phys Chem B. 2011 May 19;115(19):5971-9. doi: 10.1021/jp109088h. Epub 2011 Apr 15.
In this work, we reported a detailed study of the solvation dynamics of coumarin-480 in [bmim][BF(4)]/BHDC/benzene reverse micelles (RMs) with varying [bmim][BF(4)]/BHDC molar ratio (R) 1.00, 1.25, 1.50, and also study the solvation dynamics at five different temperatures from 15 to 35 °C RMs at [bmim][BF(4)]/BHDC molar ratio 1.25 for the first time. The average solvation time constant becomes slightly faster with the increase in R values at a temperature 25 °C. The solvation dynamics of the RMs with R value 1.25 becomes faster with the increase in temperature. We have also investigated temperature-dependent solvation dynamics in neat [bmim][BF(4)]. The solvation dynamics in neat [bmim][BF(4)] has a substantial temperature effect but for the [bmim][BF(4)]/BHDC/benzene RMs the temperature effect on the solvation dynamics is not that significant. Time-resolved fluorescence anisotropy studies reveal a decrease in the rotational restriction on the probe with increasing temperature. Wobbling-in-cone analysis of the anisotropy data also supports this finding.
在这项工作中，我们详细研究了香豆素-480 在[bmim][BF(4)]/BHDC/苯反胶束（RM）中的溶剂化动力学，[bmim][BF(4)]/BHDC 的摩尔比（R）分别为 1.00、1.25、1.50，还首次在[bmim][BF(4)]/BHDC 摩尔比为 1.25 的五个不同温度下研究了 RM 的溶剂化动力学。在 25°C 的温度下，随着 R 值的增加，平均溶剂化时间常数略微加快。R 值为 1.25 的 RM 的溶剂化动力学随温度升高而加快。我们还研究了纯[bmim][BF(4)]中依赖于温度的溶剂化动力学。纯[bmim][BF(4)]中的溶剂化动力学对温度有很大的影响，但对于[bmim][BF(4)]/BHDC/苯 RM，溶剂化动力学对温度的影响不那么显著。时间分辨荧光各向异性研究表明，探针的旋转限制随温度升高而降低。各向异性数据的摇摆锥分析也支持这一发现。
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