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Ion association of the ionic liquid [bmim][Cl] in acetonitrile and in water was studied by dielectric spectroscopy for salt concentrations c r 1. Only contact ion pairs were detected in both solvents. Standard-state enthalpy, entropy and heat capacity changes of ion association were derived, as well as the activation enthalpy of charge transport and the limiting conductivity of the cation, l). These data, in conjunction with effective solvation numbers obtained from the dielectric spectra, suggest that the solvation of [bmim] + is much weaker in water than in acetonitrile.

A systematic investigation of influence of the length of the side alkyl chain and the counter ions on the thermodynamic of the micellization process at imidazolium based surface active ionic liquids (SAILs) in aqueous solution was carried out by isothermal titration calorimetry (ITC) in a broad temperature range. The effect of alkyl chain length on the micellization process in water has been investigated on 1decyl-3-methylimidazolium ([C 10 mim]Cl) 1-dodecyl-3-methylimidazolium ([C 12 mim]Cl), 1tetradecyl-3-methylimidazolium ([C 14 mim]Cl) and 1-hexadecyl-3-methylimidazolium ([C 16 mim]Cl) chlorides, whereas the influence of counterion was studied at the micellization of 1-dodecyl-3-methylimidazolium chloride ([C 12 mim]Cl), bromide ([C 12 mim]Br), iodide ([C 12 mim]I), acetate ([C 12 mim]OAc), methanesulfonate ([C 12 mim]OMs), toluensulfonate (([C 12 mim]OTs), trifluromethane sulfonate ([C 12 mim]OTf), trifluoro acetate (([C 12 mim]TFA) and salicylate ([C 12 mim]Sal) in water.