Acoustic, volumetric and spectroscopic properties of formamide + N-methylformamide + 2-chloroethanol at different temperatures

Abstract

The ultrasonic velocity () and density () of ternary mixture of formamide (FA) + N-methylformamide (NMF) + 2-chloroethanol (2-CletOH) have been measured at temperatures 298.15, 308.15 and 318.15 K, over the entire composition range. From the experimental values of ultrasonic velocity and density, adiabatic compressibility (), intermolecular free length (), molar sound velocity (), molar compressibility () and specific acoustic impedance () have been calculated. The excess values of ultrasonic velocity (), adiabatic compressibility () and molar volume () were also calculated. Further, the infrared spectra have been recorded at room temperature (298.15 K) and found to be useful for understanding the presence of extensive hydrogen bonding between oxygen atom of C=O group of FA and NMF molecules and hydrogen atom of the H–O group of 2-CletOH molecule in the present liquid mixture.

Keywords:

• ultrasonic velocity
• acoustical parameter
• infrared spectrum
• molecular interaction
• ternary mixture

Acknowledgement

The authors would like to express their appreciation to Professor V.K. Pandey, Department of Chemistry, University of Lucknow for his kind interest and helpful suggestions and to Dr. Rajiv Manohar, Department of Physics, University of Lucknow, Lucknow for providing FT-IR facility.