Ultrasonic and Volumetric Studies of Molecular Interactions in Acetonitrile + 1‐Alkanol (C₆, C₈, C₁₀) Binary Liquid Mixtures at Different Temperatures

Abstract

The densities, r, and ultrasonic speeds, u, have been measured in the binary liquid mixtures of acetonitrile (ACN) with 1-hexanol, 1-octanol and 1-decanol, and in the pure components, as a function of composition at 25, 30, 35, 40 and 45°C. The deviations in isentropic compressibility, Dks, excess molar volume, V E , deviations in ultrasonic speed, Du, apparent molar compressibility, K f,2, apparent molar volume, Vf,2, partial molar compressibility,`K°f,2, and partial molar volume,`V°2, of 1-alkanols in ACN have been calculated from the experimental data of densities and ultrasonic speeds. The variations of these parameters with composition of the mixtures indicate that the structure-breaking effect dominates over that of the hydrogen-bonding effect between unlike molecules, suggesting that ACN-alkanol interaction is weaker than ACN-ACN and alkanolalkanol interactions, and that the interaction (ACN-alkanol) follows the order: 1-hexanol > 1-octanol > 1decanol. The excess molar volume data have been analysed by using Flory and Prigogine-Flory-Patterson theories. Further, the ultrasonic speeds in these mixtures were theoretically calculated with the help of several theories and empirical relations using the pure component data. The validity and relative merits of these theories and relations have been discussed.

Molecular Interaction Studies of H-Bonded Complexes of Benzamide in 1,4-Dioxan with Alcohols From Acoustic and Thermodynamic Parameters

“…Several researches [5][6][7][8][9] have studied the complexes of alcohols with ketones, amides, esters, nitriles and amines using ultrasonic velocity measurements. The investigation regarding the molecular association in organic ternary mixtures having alcohol as one of the components is of particular interest, since alcohols are highly polar and self associated through hydrogen bonding in pure state [10] . Amides can be regarded as the templates for protein backbones.…”

Densities and volumetric properties of (acetonitrile+an amide) binary mixtures at temperatures between 293.15K and 318.15K

“…15 volume, V E m , and partial molar volumes, V m;1 and V m;2 . The variation of these parameters with composition and temperature of the mixtures has been discussed in terms of molecular interaction in these mixtures.…”

Molecular interactions in solutions of poly vinyl alcohol : an ultrasonic study

“…Ultrasonic non destructive testing has been served as a realistic technique since it can be appropriate to study many of the aqueous, pure non-aqueous and mixed electrolytic solutions which may lead to new insights into the process of ionion and ion-solvent interactions (Bebek, 2005). The ultrasonic study of liquid mixtures have of greater significance in understanding intermolecular interactions between the component molecules as they can locate numerous applications in industrial and technological processes (Acharya et al, 2003;Ali and Abida, 2004). The study of propagation of ultrasonic waves in liquid systems is recognized as a simple and efficient tool in determining the nature of interactions between molecules in liquids and solutions.…”