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(352ad) High-Pressure Densities and Derived Properties of Binary {1-Ethyl-3-Methylimidazolium Trifluoromethanesulfonate ([EMIM][triflate]) + Alcohols} Mixtures

Hauk, D. B., Universidade Estadual de Campinas
D'Angelo, J. V. H., Universidade Estadual de Campinas
The density of binary mixtures of {1-Ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][triflate]) + alcohols} has been measured at temperatures from (298.15 to 308.15) K and pressures from (0.1 to 40) MPa. The effects of temperature and pressure on density and calculated excess molar volumes, partial molar volumes, apparent molar volumes and partial molar volumes at infinite dilution were analyzed. The experimental density results were correlated by using the Tait-Tammann equation to deduce isothermal compressibility and isobaric expansion. In order to collaborate with the thermodynamic study, some spectroscopic properties (1H-NMR and 13C-NMR) were presented to understand some possible molecular interaction between the components in the mixtures.

The values of excess molar volumes for all binary mixtures studied are negative for all the temperatures and pressures measured over the whole composition range. When the pressure increases, the values of excess molar volumes decrease. All the binary mixtures studied in this work were also analyzed using nuclear magnetic resonance spectroscopy (1H-NMR and 13C-NMR) of all components and their mixtures. In all the systems, no difference was observed on variation of chemical shift, which indicates that chemical interaction is small or absent. These analyses may indicate that structural effects caused by the difference in the molar volume and free volume, between the components present in the mixtures, are predominant in the systems studied.