Abstract

The density and surface tension of the ionic liquid (IL) [C2mim][SCN] (1-ethyl-3-methylimidazolium thiocyanate) were measured in a temperature range from (298.15 to 338.15) K. In terms of Glasser's semiempirical relation theory of ILs, the standard molar entropy and lattice energy of the homologous series of ILs [Cnmim][SCN] of the IL were estimated at 298 K, respectively. Using Kabo's method and Rebelo's method, the molar enthalpy of vaporization of the IL, H(298), at 298 K and,  H(Tb), at hypothetical normal boiling point was estimated, respectively. According to the interstice model, the thermal expansion coefficient of the IL was calculated and in comparison with experimental value, it is in good agreement.In terms of semiempirical method, physicochemical properties molecular volume Vm, parachor P, surface tension r, thermal expansion coefficients a, of the homologue of [Cnmim][SCN] (n = 3, 4) were predicted.

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