No abstract

The electrical conductances of dilute solutions of the ionic liquids 1-ethyl-3-methylimidazolium tetrafluoroborate [emim]BF 4 and 1-butyl-3-methylimidazolium tetrafluoroborate [bmim]BF 4 in N,N-dimethylformamide have been measured over the temperature range from (283.15 to 318.15) K. The ionic association constant, K A , limiting molar conductivities, Λ o , and distance parameters, R, were obtained using the Fuoss−Justice equation for the investigated systems. Slight ion association effect was found for the ionic liquids in DMF at all experimental temperatures. From the temperature dependence of the limiting molar conductivities the Eyring's activation enthalpy of charge transport was estimated. The thermodynamic functions such as Gibbs free energy, entropy, and enthalpy for the process of ion pair formation were calculated from the temperature dependence of the ion association constants.

The electrical conductances of very dilute solutions of the ionic liquids 1-ethyl-3-methylimidazolium tetrafluoroborate [emim] [BF 4 ] and 1-butyl-3-methylimidazolium tetrafluoroborate [bmim] [BF 4 ] in the low-permittivity solvent dichloromethane have been measured in the temperature range from 278.15 to 303.15 K at 5 K intervals. The data was analyzed assuming the possible presence of contact (CIP) and solvent-separated (SSIP) ion pairs in the solution on the basis of lcCM model to obtain ionic association constants, K A , and the limiting molar conductivities, Λ o , of these electrolytes. The examined ionic liquids are strongly associated in dichloromethane over the whole temperature range. From the temperature dependence of the limiting molar conductivities, the Eyring's activation enthalpy of charge transport was determined. The thermodynamic functions such as Gibbs energy, entropy, and enthalpy of the process of ion pair formation were calculated from the temperature dependence of the association constants.

No abstract

No abstract