Nature of the molecular interaction between 1-ethyl-3-methylimidazolium methylsulfate ionic liquid with higher chain alcohol through binary mixtures containing thermophysical properties

Abstract In this work, the sophisticated thermodynamic techniques: thermodynamic and thermophysical properties of binary mixtures of 1-ethyl-3-methylimidazolium [C 2 mim][MeSO 4 ] with various organic solvents were determined at different temperatures and under ambient pressure. Experimental densities and speed of sound of binary systems of IL with 1-alcohols: 1-heptanol, 1-octanol or 1-nonanol were measured at temperature range from (25 to 35) 0 C. The excess molar volumes ( V E ) and excess isentropic compressibilities ( κ s E ) were derived using the experimental data. The positive to negative V E values were observed for the systems [C 2 mim][MeSO 4 ] with 1-heptanol or 1-octanol whereas the only positive V E values for the 1-nonanol system. Negative κ s E values obtained for the systems [C 2 mim][MeSO 4 ] with 1-heptanol or 1-octanol except higher composition of 1-octanol and positive κ s E values for the 1-nonanol system at all temperatures. A discussion was carried out in terms of interactions and structure factors in these binary mixtures based on results obtained.