Structural and interactional studies of homologous series of α,ω-alkanediols in N, N-dimethylformamide

Abstract

The thermodynamic parameters viz. excess molar volume V E and ultrasonic velocity u, transport parameter viscosity η and spectroscopic parameters viz. IR, 1H and 13C NMR have been measured for the mixtures of α,ω-alkanediols (1,2- ethanediol, 1,3-propanediol and 1,5-pentanediol) and N, N-dimethylformamide over the whole composition range at T = 308.15 K. The partial molar quantities Q i E , isentropic compressibility K S E , deviation in ultrasonic velocity u D, viscosity deviation Δ η, deviation in Gibbs free energies of activation for viscous flow g( x) and excess NMR chemical shift δ E have been estimated and analysed. The results reveal distinctly that the interaction between unlike molecules takes place through hydroxyl groups of α,ω-alkanediols and the CO group of N, N-dimethylformamide. An excellent correlation between thermodynamic and spectroscopic measurements has been observed.