Ultrasonic Speeds, Excess Volumetric Quantities, and Intermolecular Hydrogen Bond Strengths of Binary Fluids of N-Methylformamide with Diols

International Journal of Chemistry | Vol. 6, No. 4, April 2015 | pp. 25–32

DOI: 10.46882/2015/IJC/000079

Article Type: Original Research Paper

Title: Ultrasonic Speeds, Excess Volumetric Quantities, and Intermolecular Hydrogen Bond Strengths of Binary Fluids of N-Methylformamide with Diols

Names of Authors: E. C. Chiemeka¹, M. A. K. Al-Saeed²*

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

Abstract: Investigating ultrasonic velocities and excess thermodynamic parameters across multi-component fluid systems provides valuable foundational insights into industrial solvent behaviors and intermolecular hydrogen bonding configurations. This study presents the experimental determination of ultrasonic speed (u), density (rho), and dynamic viscosity (eta) for binary liquid mixtures of N-methylformamide (NMF) with ethylene glycol, diethylene glycol, and triethylene glycol over the complete composition range at temperatures of 298.15 K, 308.15 K, and 318.15 K under atmospheric pressure. From these basic data, excess molar volumes (V^E) and excess isentropic compressibilities (kappa_s^E) were calculated. The resulting datasets were successfully fitted to the Redlich-Kister polynomial expression to compute binary interaction coefficients and standard standard deviations. All investigated liquid mixtures exhibited highly negative excess molar volumes (V^E) and negative excess isentropic compressibilities (kappa_s^E) across all composition bounds. These strong negative deviations confirm dense interstitial molecular packing and intense intermolecular hydrogen bonding networks between the amidic carbonyl of NMF and the terminal hydroxyl protons of the diols, which decrease in intensity as thermal energy increases.

Keywords: Ultrasonic speed; Excess molar volume; Isentropic compressibility; N-methylformamide; Redlich-Kister equation; Hydrogen bonding

Manuscript Timeline: Received: May 11, 2014; Revised: June 22, 2014; Accepted: July 18, 2014; Published: April 02, 2015.

Citation: Chiemeka, E. C., & Al-Saeed, M. A. K. (2015). Ultrasonic Speeds, Excess Volumetric Quantities, and Intermolecular Hydrogen Bond Strengths of Binary Fluids of N-Methylformamide with Diols. International Journal of Chemistry, 6(4), 25–32.

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