Thermodynamic and Acoustic Study on Molecular Interactions in Certain Binary Liquid Systems Involving Ethyl Benzoate

Abstract

Speeds of sound and density for binary mixtures of ethyl benzoate (EB) with N,N-dimethylformamide (NNDMF), N,N-dimethyl acetamide (NNDMAc), and N,N-dimethylaniline (NNDMA) were measured as a function of mole fraction at temperatures 303.15, 308.15 K, 313.15 K, and 318.15 K and atmospheric pressure. From the experimental data, adiabatic compressibility ( ad ), intermolecular free length ( ), and molar volume ( ) have been computed. The excess values of the above parameters were also evaluated and discussed in light of molecular interactions. Deviation in adiabatic compressibilities and excess intermolecular free length ( ) are found to be negative over the molefraction of ethyl benzoate indicating the presence of strong interactions between the molecules. The negative excess molar volume values are attributed to strong dipole-dipole interactions between unlike molecules in the mixtures. The binary data of Δ ad , , and were correlated as a function of molefraction by using the Redlich-Kister equation.

Excess Thermodynamic Parameters of Binary Liquid Mixtures of Dimethyl Malonate with Isomeric Xylenes at Different Temperatures

“…Electron pairs on the carbonyl group of ester and the π-electrons of benzene ring in p-xylene molecules can interact in several manners (Fig. 2), which can be utilized to elucidate the divergence in adiabatic compressibility [26,27]. For example, (i) molecules become slower and more compressible as a result of changes in their sizes and shapes as well as the loss of dipole-dipole interaction, and (ii) the formation of hydrogen-bonded complexes or dipole-dipole interactions between molecules with opposite charges, results in an increase in the sound velocity and a decrease in the compressibility.…”

Theoretical Evaluation of Ultrasonic Velocities of Binary Liquid Mixtures of 1-Bromopropane in Chlorobenzene at 303.15, 308.15, 313.15 and 318.15 K

“…The maximum deviation in Van Deal and Vangeel (IMR) theory and Rao's specific velocity method relation are due to the associated and non-associated components present in the mixture of different size components. The reason may be the limitations and approximations incorporated in these theories [16][17][18][19]. Thus, the observed deviation of theoretical values of velocity from the experimental values shows that the molecular interactions are taking place [20][21] between the unlike molecules in the liquid mixture.…”

Effect of Solvents on the Ultrasonic Velocity and Acoustic Parameters of Polyvinylidene Fluoride Solutions

“…Ultrasonic studies in polymeric solutions have drawn the attention of many researchers in the recent years [1][2][3][4]. The extensive use of polymeric materials in technology has necessitated investigations of the molecular interactions of polymers and solvents [5][6][7][8][9].…”