Excess thermodynamic properties and FTIR studies of binary mixtures of aniline with esters at different temperatures

Abstract

Densities (ρ) and speeds of sound (u) were measured over the entire mole fraction range for the binary mixtures of aniline with butyl acetate (BA), iso-butyl acetate (IBA), tert-butyl acetate (TBA) and butyl acrylate (BAc) at T = (303.15–318.15) K. These data were used to compute excess molar volume (VmE), excess isentropic compressibility (κSE) and excess speed of sound (uE) for investigating the different types of intermolecular interactions present in the mixtures. These parameters have been correlated with Redlich-Kister equation. Further, the u and VmE values have been analyzed with different theoretical models. The molecular structure and polarity of the ester molecule along with the nature and bulkiness of its alkyl group found to affect the magnitude of investigated excess thermodynamic properties of the binary systems. FTIR spectral analysis of these mixtures was used to understand the interactions between component molecules and to correlate them with the thermodynamic findings.