Department of Chemistry, Imperial College London, London, UK.
Phys Chem Chem Phys. 2011 Oct 6;13(37):16831-40. doi: 10.1039/c1cp21262a. Epub 2011 Aug 22.
The polarities of a wide range of ionic liquids have been determined using the Kamlet-Taft empirical polarity scales α, β and π*, 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.
已使用 Kamlet-Taft 经验性极性标度 α、β 和 π* 确定了一系列离子液体的极性，所用染料组为 Reichardt 的染料、N,N-二乙基-4-硝基苯胺和 4-硝基苯胺。这些已与不同染料组和不同极性标度的这些参数的测量值进行了比较。结果强调了认识溶质性质在确定这些标度中所起作用的重要性。特别指出的是，基于带电溶质的极性标度与基于中性探针的极性标度相比，可给出离子液体极性的非常不同的值。最后，报告了离子液体中常见杂质的影响。
