Imidazolium based ionic liquids containing methanesulfonate anion: comprehensive thermodynamic study

Abstract New experimental vapor pressures and vaporization enthalpies of the ionic liquids [C n mim][CH 3 SO 3 ] (with the alkyl chain length n = 2, 3 and 4) have been measured by the QCM and TGA methods. Energies of combustion of [C 2 mim][CH 3 SO 3 ] and [C 4 mim][CH 3 SO 3 ] were measured in a high-precision rotating-bomb combustion calorimeter and used for calculation the aqueous enthalpy of formation of the Δ f H m o ( CH 3 SO 3 aq − ) anion. The solubility parameters of ILs under study have been derived from experimental Δ l g H m o (298.15 K) and used for estimation of miscibility of some common solutes in [C n mim][CH 3 SO 3 ]. This comprehensive thermodynamic study will facilitate chemical engineering calculations of processes involving ionic liquids.