Conductometric Studies of 1-Ethyl-3-methylimidazolium Tetrafluoroborate and 1-Butyl-3-methylimidazolium Tetrafluoroborate in 1-Propanol at Temperatures from (283.15 to 318.15) K

摘要

The electrical conductances of dilute solutions of the ionic liquids 1-ethyl-3-methylimidazoliumtetrafluoroborate [emim][BF4] and 1-butyl-3-methylimidazolium tetrafluoroborate [bmim][BF4] in 1- propanol have been measured in the temperature range from (283.15 to 308.15) K at 5 K intervals. Theionic association constant, KA, limiting molar conductances, o, and distance parameters, R, wereobtained using the low concentration Chemical Model (lcCM). The examined electrolytes are stronglyassociated in 1-propanol in the whole temperature range. From the temperature dependence of thelimiting molar conductivities the Eyring activation enthalpy of charge transport was estimated. Thethermodynamic functions such as Gibbs energy, entropy, and enthalpy of the process of ion pairformation were calculated from the temperature dependence of the association constants.