The interactions of phosphate salts like disodium hydrogen phosphate (Na 2 HPO 4 ) and dipotassium hydrogen phosphate (K 2 HPO 4 ) with 1-hexyl-3-methylimidazolium chloride ([C 6 mim][Cl]) as a function of temperature have been investigated by combination of volumetric and acoustic measurements. Densities, ρ, and speeds of sound, u, for phosphate salts in aqueous solutions of 1-hexyl-3-methylimidazolium chloride have been measured at T = (288. 15, 293.15, 298.15, 303.15, 308.15) K and atmospheric pressure. The apparent molar volume, limiting apparent molar volume and standard partial molar volumes of transfer for phosphate salts from water to aqueous 1-hexyl-3-methylimidazolium chloride solutions have been calculated from density data. Apparent molar isentropic compression, limiting apparent molar isentropic compression and standard partial molar isentropic compression of transfer have been calculated from speeds of sound data. The UV absorption studies have also made in this study. The results have been explained in terms of competing patterns of interactions of cosolvent and the solute.

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Densities, ρ, and speeds of sound, u, for trisodium citrate and tripotassium citrate in (0.01 and 0.03) mol·kg −1 in aqueous solutions of 1-hexyl-3-methylimidazolium chloride ([C 6 mim][Cl]) over a range of temperatures T = (288. 15, 293.15, 298.15, 303.15, 308.15) K have been measured at atmospheric pressure. The experimental densities are used to calculate the apparent molar volume, limiting apparent molar volumes, and transfer volumes. Experimental values of the speed of sound were used to estimate apparent molar isentropic compression, limiting apparent molar isentropic compression, and transfer parameter. The structure making or breaking ability of 1-hexyl-3-methylimidazolium chloride has been discussed in terms of the sign of (∂ 2 V ϕ 0 /∂T 2 ). The UV absorption studies have also been made in this study. The results have been discussed in terms of competing patterns of interactions prevailing in the solute and solvent, that is, citrate salt + [C 6 mim][Cl] + water mixtures.

The physical nature of [C16mim][Br] as monomers/micelles led to different IL–CTAB mixed self-assembled structures.