Themolecular interactions between the ionic liquid trimethylbutylammomiumbis(trifluoromethylsulfonyl)imide, [N1114][Tf2N], and three common solvents, including short chain alcohols (ethanoland 1-propanol) and an aprotic solvent (N,N-dimethylformamideor DMF) were investigated through experimental properties. The excessenthalpies were measured by calorimetry at temperatures from 308.15K to 323.15 K over the whole composition range and excess volumeswere calculated from density measurements. The vapor–liquidequilibrium (VLE) measurements of the [N1114][Tf2N] + DMF mixture were obtained using a headspace gas chromatographyinstrument. It was determined that hydrogen bonds between the alcoholmolecules contribute to the positive excess enthalpies, while thefavorable interactions between DMF and [N1114][Tf2N] might be explained by electrostatic interactions between the ionicliquid and the zwitterionic resonance structure of DMF. The nonrandomtwo liquid (NRTL) equation was successfully used to correlate theexcess enthalpy and VLE results. [ABSTRACT FROM AUTHOR]