Estimation of Physico-chemical Properties of Ionic Liquid EPReO4 Using Surface Tension and Density

An ionic liquid (IL) EPReO4 (N-ethylpyridinium rheniumate) was prepared. The density and surface tension values of the IL were determined in the temperature range of 293.15-343.15 K. The ionic volume and surface entropy of the IL were estimated by extrapolation, respectively. In terms of Glasser's theory, the standard molar entropy and lattice energy of the IL were estimated, respectively. Using Kabo's and Rebelo's methods, the molar enthalpy values of vaporization of the IL, Delta H-g(1)m(0) (298 K), at 298 K and, Delta H-g(1)m(0) (T-b), at hypothetical normal boiling point were estimated, respectively. According to the interstice model, the thermal expansion coefficient of IL EPReO4 (alpha) was calculated and compared with experimental value, finding their magnitude order is in good agreement by 8.98%.