Ultrasonic Speeds, Excess Volumetric Parameters, and Hydrogen Bond Formations of Binary Liquid Systems of Isobutanol with Aliphatic Esters

International Journal of Chemistry | Vol. 7, No. 12, December 2016 | pp. 89–96

DOI: 10.46882/2016/IJC/000099

Article Type: Original Research Paper

Title: Ultrasonic Speeds, Excess Volumetric Parameters, and Hydrogen Bond Formations of Binary Liquid Systems of Isobutanol with Aliphatic Esters

Names of Authors: E. C. Chiemeka¹, A. M. H. Al-Ghamdi²*

Authors’ Affiliations:
¹Department of Chemistry, Federal University of Technology, Owerri, Nigeria.
²Department of Chemistry, University of Khartoum, Khartoum, Sudan.

Abstract: Experimental determination of ultrasonic velocities and fluid densities across varied temperature states yields critical baseline data needed to map hydrogen bond associations and molecular packing dynamics in multi-component chemical systems. This paper presents the measurement of ultrasonic velocity (u), density (rho), and dynamic viscosity (eta) for binary liquid mixtures of isobutanol with methyl acetate, ethyl acetate, and propyl acetate across the entire composition matrix at temperatures of 298.15 K, 308.15 K, and 318.15 K under atmospheric pressure. From these raw data metrics, excess molar volumes (V^E) and excess isentropic compressibilities (kappa_s^E) were calculated. The calculated excess datasets were successfully fitted to the Redlich-Kister polynomial expression to compute the binary interaction coefficients and standard standard deviations. All investigated binary mixtures exhibited significant negative excess molar volumes (V^E) and negative excess isentropic compressibilities (kappa_s^E) across all composition bounds. These strong negative deviations reveal dense interstitial molecular packing and strong intermolecular hydrogen bond formation between the hydroxyl protons of isobutanol and the ester carbonyl centers, which decrease in intensity as thermal motion breaks the dipole networks.

Keywords: Ultrasonic velocity; Excess molar volume; Isentropic compressibility; Aliphatic esters; Redlich-Kister equation; Hydrogen bonding

Manuscript Timeline: Received: February 05, 2016; Revised: March 12, 2016; Accepted: April 08, 2016; Published: December 04, 2016.

Citation: Chiemeka, E. C., & Al-Ghamdi, A. M. H. (2016). Ultrasonic Speeds, Excess Volumetric Parameters, and Hydrogen Bond Formations of Binary Liquid Systems of Isobutanol with Aliphatic Esters. International Journal of Chemistry, 7(12), 89–96.

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