Abstract
Thermophysical properties of some binary mixtures of novel choline chloride-based deep eutectic solvents and two aromatics (benzene and thiophene) were measured to evaluate the nature of solute–solvent interactions at T = (283.15–303.15) K and atmospheric pressure. Choline chloride was selected as hydrogen bond donor and (mono-, di- and tri-) ethylene glycols or (mono-, di- and tri-) ethanolamines were used as hydrogen bond donors. The density (d), speed of sound (u), viscosity (η) and refractive index (nD) data were measured for binary mixtures of benzene or thiophene with the selected DESs at T = (283.15–303.15) K. The apparent molar volume (Vφ), standard partial molar volume (Vφ0 ), partial molar isentropic compression (κφ0 ), excess molar volume (VE), viscosity B-coefficient and molar refraction (RD) values, were obtained for the binary mixtures at dilute region of aromatics. These quantities are used for interpreting of the studied DESs and benzene or thiophene molecular interactions. Also, the scaled particle theory (SPT) was used for calculation of interaction volume (Vint), and cavity volume (Vcav). The obtained results indicate that DESs with amine functional groups interact more effectively with benzene or thiophene rather than ethylene glycolic-based DESs.
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