Basic physicochemical properties, excess properties, and intermolecular interactions of n-propanol/isopropanol and ethylenediamine binary mixtures

Abstract

Density (ρ) and viscosity (η) values of binary mixtures composed of n-propanol/isopropanol and ethylenediamine (EDA) were measured at T = (298.15–318.15) K and P = 1005 hPa (atmospheric pressure in Tianjin, China). The excess properties, including viscosity deviation (Δη), excess molar volume (VmE), and excess Gibbs energy of activation of viscous flow (ΔG*E), were then obtained. The least-squares method and Jouyban–Acree model were used to correlate the experimental ρ values and kinematic viscosity associated with three semi-empirical models, and a superior fitting was obtained by comparing the model parameters. VmE, Δη, and ΔG*E were fitted to the Redlich–Kister equation, and partial molar volumes, apparent molar volumes, and viscous activation parameters of n-propanol/isopropanol and EDA binary mixtures were calculated. Raman spectroscopy, fluorescence spectroscopy (FLS), 1H NMR spectroscopy, and computational chemistry methods were used to demonstrate the existence of intermolecular hydrogen bonds (IHBs) in n-propanol/isopropanol and EDA binary mixtures, and the form of IHBs was confirmed as –OH···NH2–. Finally, the CO2 uptake rate was measured for binary mixtures at the molar fractions with strong intermolecular interactions.