FTIR Spectra of pure components and their binary liquid components (Binary mixtures of formamide with aniline, N-methyl aniline and N,N-dimethyl aniline)

Densities (rho) speeds of sound (u) and viscosities (eta) of binary mixtures of formamide (F) with aniline (A), N-methylaniline (NMA)and N,N-dimethylaniline (DMA), including those of pure liquids, over the entire composition range were measured at temperatures (303.15, 308.15 and 313.15) K and 0.1 MPa. Using the experimental data, the excess parameters (V-E, k(s)(E)), deviation in viscosity (Delta eta), excess partial molar volumes, (V) over bar (E)(m,1) and (V) over bar (E)(m,2) and excess partial molar isentropic compressibilities, (K) over bar (E)(s,m,1) and (K) over bar (E)(s,m,2) of the components at infinite dilution were calculated. The V-E results have been analysed in terms of Prigogine-Flory-Patterson theory. An analysis of each of the three contributions viz. interactional, free volume and P* to V-E shows that free volume effects are negative for all the binary mixtures. FT-IR properties have been carried out to study the specific interaction, such as the formation of a hydrogen bond between unlike molecules in the binary liquid mixtures. A good agreement is observed among the excess parameters and FT-IR spectroscopic properties.