Excess Molar Enthalpies of Binary Mixtures Containing 1-Methyl-3-octyl-imidazolium Tetrafluoroborate and Alcohols at T = 298.15 K

An isothermal titration calorimeter was used to measure the excess molar enthalpies (HE) at T = 298.15 K for five binary systems: 1-methyl-3-octyl-imidazolium tetrafluoroborate (OmimBF4) + alcohols (ethanol, 1-propanol, 2-propanol, 1-butanol, and 1-pentanol). The values of HE were found to be all positive for the five systems and were fitted with the Redlich–Kister polynomial and the UNIQUAC mode. The magnitude order of HE for the five systems was explained by the balance between the magnitude orders of enthalpies of the alcohol/alcohol and the alcohol/OmimBF4 interactions.