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E-Journal of Chemistry
Volume 7 (2010), Issue 2, Pages 465-472

Molecular Interaction Studies on N-Alkanols with DMA in Toluene at 303K

S. Thirumaran, J. Earnest Jayakumar, and B. Hubert Dhanasundaram

Department of Physics (DDE), Annamalai University, Annamalainagar-608 002, India

Received 17 September 2009; Accepted 10 November 2009

Copyright © 2010 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The ultrasonic study of velocity, density and viscosity has been measured for the mixtures of n-alkanols, namely; 1-propoanol, 1-butanol and 1-pentanol in toluene with N-N dimethyl acetamide (DMA) at 303K. The experimental data have been used to calculate the acoustical parameters such as adiabatic compressibility (β), intermolecular free length (Lf), free volume (Vf), internal pressure (πi) and acoustic impedance (Z). The excess values of the above parameters have also been evaluated and presented. From the present investigation, it is obvious that a weak molecular association was identified. Mixing of DMA with n alkanols causes dissociation of hydrogen bonded structures of n- alkanols. Also, further addition of DMA with the mixture not only causes dissociation of hydrogen bonded structures of n-alkanols but also a decrease in molecular association between toluene and n-alkanols is observed. The evaluated excess values predict weak molecular interactions existing between DMA-n-alkanols as well as toluene-n-alkanols.