Investigations of Molecular Interactions in Binary Mixtures of the Ionic Liquid [Emim][BF4] and N-Methylaniline at Temperatures from 293.15 to 323.15 K

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Density (ρ) and speed of sound (u) values were measured for the binary mixture of 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim][BF4]) and N-methylaniline over the entire range of mole fractions at temperatures from 293.15 to 323.15 K under atmospheric pressure. Using the basic experimental data, various acoustic and thermodynamic parameters were calculated and are discussed with regard to the molecular interactions in the binary systems. The partial molar volumes and partial molar isentropic compressibilities at infinite dilution have also been calculated. The excess values were fitted to Redlich–Kister polynomial equation to estimate the binary coefficients and standard deviation between the experimental and calculated values. Further, the molecular interactions in the binary mixture system are analyzed using the experimental FT-IR spectra recorded at room temperature.