Acoustic Velocities, Volumetric Properties, and Intermolecular Interactions of Binary Solvent Systems of Methanol with Alkyl Acetates

International Journal of Chemistry | Vol. 3, No. 10, October 2012 | pp. 98–105

DOI: 10.46882/2012/IJC/000049

Article Type: Original Research Paper

Title: Acoustic Velocities, Volumetric Properties, and Intermolecular Interactions of Binary Solvent Systems of Methanol with Alkyl Acetates

Names of Authors: E. C. Chiemeka¹, A. B. Adekunle²*

Authors’ Affiliations:
¹Department of Chemistry, Federal University of Technology, Owerri, Nigeria.
²Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria.

Abstract: Ultrasonic velocity and density measurements provide a reliable method for evaluating molecular packaging and specific dipole interactions within binary liquid mixtures. This study presents the experimental determination of ultrasonic speed (u), density (rho), and viscosity (eta) for binary systems of methanol with methyl acetate, ethyl acetate, and propyl acetate over the full composition matrix at temperatures of 298.15 K and 308.15 K under atmospheric pressure. From these basic data, excess molar volumes (V^E) and excess isentropic compressibilities (kappa_s^E) were calculated. The calculated excess data were fitted to the Redlich-Kister polynomial equation to estimate the binary interaction coefficients and standard standard deviations. All investigated mixtures exhibited negative values for both V^E and kappa_s^E across the entire composition spectrum. These negative deviations indicate strong structural interactions, compact molecular packaging, and hydrogen bonding between the hydroxyl proton of methanol and the ester carbonyl centers. The magnitude of these negative parameters increased with ester chain length, confirming that enhanced hydrophobic properties reinforce intermolecular dipole associations in solution.

Keywords: Ultrasonic velocity; Excess molar volume; Isentropic compressibility; Binary mixtures; Redlich-Kister equation; Molecular interactions

Manuscript Timeline: Received: October 15, 2011; Revised: November 22, 2011; Accepted: December 12, 2011; Published: October 04, 2012.

Citation: Chiemeka, E. C., & Adekunle, A. B. (2012). Acoustic Velocities, Volumetric Properties, and Intermolecular Interactions of Binary Solvent Systems of Methanol with Alkyl Acetates. International Journal of Chemistry, 3(10), 98–105.

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