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

The current article presents the experimental density (rho) 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 (V-m), excess molar volume (V-m(E)), apparent molar volumes (V-m,V-circle divide,V-1 and V-m,V-circle divide,V-2), partial molar volumes ((V) over bar (m1) and (V) over bar (m,2)), and excess partial molar volumes ((V) over bar (E)(m,1) and (V) over bar (E)(m,2)) values were computed over the complete mole fraction range. Also, at infinite dilution, the values of partial molar volumes ((V) over bar (m,1)degrees and (V) over bar (m,2)degrees), and excess partial molar volumes ((V) over bar (m,1)degrees(E) and (V) over bar (m,2)degrees(E)) of the isopentyl alcohol and butylamine were calculated. The calculated V-m(E) 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 H-1 NMR and FT-IR spectroscopic studies. (C) 2021 Elsevier Ltd.