Volumetric and spectroscopic properties of binary liquid mixtures of isopentyl alcohol with butylamine at T = (288.15–333.15) K

Abstract

The current article presents the experimental density (ρ) values reported as a function of mole fraction for the binary liquid mixtures of isopentyl alcohol (IPA) + butylamine (BA) at the temperatures T = (288.15 to 333.15) K with 5 K intervals under atmospheric pressure (0.1 MPa). Based on experimental data, the molar volume (Vm), excess molar volume (VmE), apparent molar volumes (Vm,∅,1and Vm,∅,2), partial molar volumes (V-m,1and V-m,2), and excess partial molar volumes (V-m,1E and V-m,2E) values were computed over the complete mole fraction range. Also, at infinite dilution, the values of partial molar volumes (V¯m,1° and V¯m,2°), and excess partial molar volumes (V¯m,1°E and V¯m,2°E) of the isopentyl alcohol and butylamine were calculated. The calculated VmE values were correlated to the Redlich-Kister (R-K) model. Further, the excess molar volume was theoretically described by using Prigogine-Flory-Patterson (PFP) theory at the above temperatures. The obtained excess molar volume shows negative deviations from the ideal behaviour and becomes more negative at a higher temperature. From the above said parameters results, the H-bonding and acid-base interactions in the unlike molecules was determined. Additionally, the existence of new H-bonding interaction between IPA and BA molecules was further confirmed using 1H NMR and FT-IR spectroscopic studies.