Understanding the polarity of ionic liquids
Understanding the polarity of ionic liquids
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DOI：
10.1039/c1cp21262a
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发表时间：
2011-01-01
影响因子：
3.3
通讯作者：
Wilding, R.
中科院分区：
文献类型：
--
作者：
Ab Rani, M. A.;Brant, A.;Wilding, R.
使用Kamlet-Taft经验极性标度α， β和pi*测定了各种离子液体的极性，染料为Reichardt染料，N， N-二乙基-4-硝基苯胺和4-硝基苯胺。这些已经与这些参数在不同染料组和不同极性尺度下的测量结果进行了比较。结果强调了认识溶质的性质在确定这些尺度中所起作用的重要性。特别值得注意的是，基于带电溶质的极性尺度与基于中性探针的极性尺度相比，可以给出非常不同的离子液体极性值。最后，报道了常见杂质对离子液体的影响。
The polarities of a wide range of ionic liquids have been determined using the Kamlet-Taft empirical polarity scales alpha, beta and pi*, with the dye set Reichardt's Dye, N, N-diethyl-4-nitroaniline and 4-nitroaniline. These have been compared to measurements of these parameters with different dye sets and to different polarity scales. The results emphasise the importance of recognising the role that the nature of the solute plays in determining these scales. It is particularly noted that polarity scales based upon charged solutes can give very different values for the polarity of ionic liquids compared to those based upon neutral probes. Finally, the effects of commonplace impurities in ionic liquids are reported.