Understanding the polarity of ionic liquids

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...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2011-01, Vol.13 (37), p.16831-16840
Main Authors: AB RANI, M. A, BRANT, A, SCHREMS, M, WELTON, T, WILDING, R, CROWHURST, L, DOLAN, A, LUI, M, HASSAN, N. H, HALLETT, J. P, HUNT, P. A, NIEDERMEYER, H, PEREZ-ARLANDIS, J. M
Format: Article
Language:English
Subjects:
Beta
Charging
Chemistry
Dyes
Empirical analysis
Exact sciences and technology
Fluorescent Dyes - chemistry
General and physical chemistry
Hydrogen Bonding
Impurities
Ionic liquids
Ionic Liquids - chemical synthesis
Ionic Liquids - chemistry
Physical chemistry
Polarity
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Summary: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.
ISSN:1463-9076
1463-9084
DOI:10.1039/c1cp21262a