Volumetric, Ultrasonic and Viscometric Studies of Molecular Interactions in Binary Mixtures of Isopropyl Benzene (Cumene) with Aromatic Hydrocarbons at 298.15K

Theoretical and experimental research on binary liquid mixtures of isopropyl benzene (cumene) with aromatic hydrocarbons at 298.15 K is presented in this article. For these binary mixtures, experimental measurements of the density (ρ), viscosity (η), and speed of sound (u) have been made at 298.15 K. The excess molar volume (), excess adiabatic compressibility (), excess sound velocity (uᴱ), and deviation in viscosity (ηᴱ) have all been computed from the experimental measurements. These excess parameters have been correlated using the Redlich–Kister polynomial equation. Positive excess properties were discovered, reflecting the distinctive behavior of the liquid mixtures and suggesting the existence of particular molecular interactions. Significant specific interactions between the components, mainly controlled by molecular association, are suggested by the positive values of the excess properties. The molecular structure and intrinsic characteristics of the liquid mixtures determine how strong these interactions are in liquid mixtures. The results indicated the presence of weak interactions between 1,4-dioxane and aromatic hydrocarbon molecules, which follows the order: Ethyl benzene > toluene > mesitylene > n-propyl benzene> tert-butyl benzene > biphenyl. It is observed that the interactions depend on the number and position of the methyl groups in these aromatic hydrocarbons. The observed trends in the following systems indicate weak to moderate interactions, primarily π–π and solute-solvent interaction.