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

The thermodynamic parameters viz. excess molar volume VE 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 = 308.15K  . The partial molar quantities QiE, isentropic compressibility KSE, deviation in ultrasonic velocity uD, viscosity deviation Δη, deviation in Gibbs free energies of activation for viscous flow g(x) and excess NMR chemical shift δE 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.