Molecular Interaction Studies in Binary Liquid Mixtures from Ultrasonic Data

Abstract

Ultrasonic velocities and densities of the binary liquid mixtures of dimethy1 sulphoxide (DMSO) with phenol,o-cresol,m-cresol,p-cresol andp-chlorophenol at 318.15 K, over the entire composition range were measured. The theoretical values of ultrasonic velocity were evaluated using the Nomoto’s Relation (NR), Ideal Mixture Relation (IMR), Free Length Theory (FT) and Collision Factor Theory (FLT). The validity of these relations and theories was tested by comparing the computed sound velocities with experimental values. Further, the molecular interaction parameter (α) was computed by using the experimental and the theoretical ultrasonic velocity values. The variation of this parameter with composition of the mixtures has been discussed in terms of molecular interaction in these mixtures.

Determination of thermodynamic properties for protonation equilibrium between isomeric cresols and N,N-dimethylaniline in n-hexane medium

“…Further, acoustical study on hydrogen bonded systems [11,12] evinced interest since they play a vital role in chemical, physical and biological processes. There are reports that the binary systems of isomeric cresols form hydrogen bonded complexes with 1-alkanols, dimethylsulfoxide, N,N-dimethylformamide and cyclohexanone [12][13][14][15]. Variable-temperature UV-vis, 13 C NMR and IR studies have been carried out in different solvents at a low temperature and the color change in ternary mixtures of phenols and amines in non-polar solvents was attributed to the proton transfer followed by the formation of hydrogen bonded complex [16].…”

Theoretical Evaluation of Ultrasonic Velocities in Ternary Liquid Mixture of Tetrahydrofuran, Heptane and Decane at Different Temperatures

“…The positive values of α in the system at all the temperatures clearly indicate the existence of strong tendency for the formation of association in mixture through hydrogen bonded complexes 14 . As is evident from the APE values (Table 2), the best results are obtained by NR followed by the results obtained from other theories.…”

Experimental and Theoretical Studies of Ultrasonic Velocity in Ternary Liquid Mixtures of Methyl Benzoate, Cyclohexane and Alcohols at Different Temperatures

“…On increasing the temperature, the ultrasonic velocity values decrease in the ternary liquid mixture. This is probably due to the fact that the thermal energy activates the molecule, which would increase the rate of association of unlike molecules 19 . Similar kinds of results were obtained by earlier workers [20][21][22][23][24][25] .…”