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A range of ionic liquids has been investigated using the Kamlet–Taft parameters α, β, and π*. It was found that π* is high for all of the ionic liquids studied and varies with both anion and cation, α is generally moderate and depends mainly on the cation, β is also moderate and depends mainly on the anion. Comparison is made with other polarity measurements in ionic liquids.
Crowhurst et al. (Wed,) studied this question.