Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

A novel asymmetrical gemini ionic liquid, 1-(3-(trimethylammonio)prop-1-yl)-3-methylimidazolium bis (dicyanamide) ([N111C3MIM][N(CN)2]2), was synthesized and characterized by 1H NMR, 13C NMR. Thermal stability of [N111C3MIM][N(CN)2]2 was investigated through thermogravimetric analysis under pure nitrogen atmosphere. Heat capacity of pure [N111C3MIM][N(CN)2]2 was measured using differential scanning calorimetry in the temperature range 298.15 423.15 K and enthalpy HT-H298.15K, and entropy ST-S298.15K were obtained. Densities and viscosities were measured for the binary system of [N111C3MIM][N(CN)2]2 and isopropanol (IPA) over the entire range of mole fractions at various temperatures from 283.15 to 333.15 K under the pressure of 0.101 MPa. Moreover, the excess molar volumes (Vm E ) and the viscosity deviations (Dg) for the binary mixtures were determined and well fitted to the Redlich Kister polynomials. The negative values of Vm E and Dg result from strong self-association and weak hydrogen bonding interaction between the molecules of [N111C3MIM][N(CN)2]2 and IPA. Excess Gibbs energy of activation (DG*E) of viscous flow for the present binary mixtures were also calculated. Results have been discussed in terms of molecular interactions and structures.