Abstract An ionic liquid (IL) based on zinc chloride BMIZn2Cl5 has been synthesized under a dry argon at-mosphere according to Lecocq’s viewpoint. The density and surface tension of the IL in temperature range from 313.15 K to 343.15 K were determined. The value of thermal expansion coefficient and surface entropy were es-timated by extrapolation. In terms of Glasser’s theory, the standard molar entropy and lattice energy of the BMIZn2Cl5 were estimated. The thermal expansion coefficients,α, calculated by the interstice model is of the same order of magnitude as the experimental value. Using the methods of Kabo and Rebelo, the molar enthalpy of vaporization of the IL, lgHm0 at 298 K and lgHm0 at the hypothetical normal boiling point were estimated.

Key words: ionic liquid based on zinc chloride, BMIZn2Cl5, density, surface tension, Glasser theory, interstice model, molar enthalpy of vaporization