Effect of Solvents and Temperature on Interactions in Binary and Ternary Mixtures of 1-Butyl-3-methylimidazolium Trifluoromethanesulfonate with Acetonitrile or/and N,N-Dimethylformamide

Abstract

The densities ρ, speeds of sounds u, and dynamic viscosities η of the pure ionic liquid (IL) 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([BMIM][CF3SO3]), acetonitrile (ACN), N,N-dimethylformamide (DMF), and of their binary and ternary mixtures as a function of mole fraction of IL/solvent at various temperatures (298.15 to 323.15) K with an interval of T = 5 K and at P = 0.1 MPa have been measured experimentally. The excess molar volumes, VE, excess molar isentropic compressibilities, KS,mE and viscosity deviations, Δη have been determined from the measured data of ρ, u, and η of pure [BMIM][CF3SO3], ACN, DMF and of their binary/ternary mixtures at studied compositions and temperatures. We have also calculated the Gibbs free energy of activation, ΔG* and an excess Gibbs free energy of activation for viscous flow, ΔG*E for the studied binary mixtures. The VE, KS,mE and Δη of the studied binary/ternary mixtures are fitted to the Redlich–Kister polynomial equation. The trends of variations of param...