Effect of ionic liquid on the solvation behavior of nonaqueous N,N′-salicylidenephenylediamine Schiff base (Salophen) solutions at 298.15 K

•Salophen schiff base and ionic liquid, [BMIm]Br were synthesized.•Thermodynamic properties of Salophen + [BMIm]Br + organic solvents were measured.•The calculated parameters were used to interpretation of the solute–solvent interactions.•The results show that the predominant interactions are nonpolar–nonpolar interactions.•Solubility of Salophen increase with increasing of [BMIm]Br concentrations.

Thermodynamic properties of N,N′-salicylidenephenylediamine Schiff base (Salophen) in the solutions of ionic liquid, 1-butyl-3-methylimidazolium bromide ([BMIm]Br) + organic solvents (N,N-dimethylacetamide DMA, and dimethylsulfoxide DMSO) have been measured at 298.15 K. The measured density and viscosity values have been used to calculate apparent molar volumes, VϕVϕ, standard partial molar volumes, Vϕ0, standard partial molar volumes of transfer, ΔtrVϕ0, viscosity B  -coefficients, and solvation numbers, B/Vϕ0, for the solutions being studied. All of these parameters were used to interpret the solute–solvent interactions and solvation process occurring between ionic liquid and Salophen.