Volumetric properties of ionic liquid 1,3-dimethylimidazolium methyl sulfate + molecular solvents at T = (298.15–328.15) K

The experimental density, d, values as function of ionic liquid concentration, m, for binary mixtures, [MMIm]MSO4 + methanol, + water, + DMSO, + DMF, and + MeCN at T = (298.15–328.15) K are reported. Apparent molar volumes Vϕ have been determined from the experimental densities and fitted to a Redlich–Mayer equation for the calculation of limiting apparent molar volume values V ϕ 0 . The values of V ϕ 0 have the following order in the investigated systems: MeCN < MeOH < DMF < DMSO < H2O. The calculated V ϕ 0 values indicate that ionic liquid + molecular solvent interactions in water and DMSO are stronger than the other solvents. The limiting apparent molar expansibilities E ϕ 0 show that at each temperature E ϕ 0 values for ionic liquid in H2O and DMSO have positive values and decrease with rising temperature. The calculated values of ( ∂ 2 V ϕ 0 / ∂ T 2 ) P for binary mixtures of containing [MMIm]MSO4 have small and negative values for studied systems. Therefore, ionic liquid under study is predominantly a structure breaker.