Molecular interactions and thermodynamic modelling of N,N-dimethyl benzyl amine-alkoxy ethanol mixtures: an FT-IR spectroscopy and Jouyban–Acree model approach

Abstract

ABSTRACT This study examines intermolecular interactions in binary mixtures of N,N-dimethyl benzyl amine (DMBA) with short-chain alkoxy ethanols (2-methoxy ethanol (ME), 2-ethoxy ethanol (EE) and 2-butoxy ethanol (BE)). Densities (ρ), speeds of sound (u) and viscosities (η) were measured from 303.15 K to 313.15 K at atmospheric pressure for all compositions. These data were used to determine excess thermodynamic and transport properties: excess molar volume (V E ), excess isentropic compressibility (κs E ), viscosity deviation (Δη) and excess Gibbs free energy of activation (ΔG *E ). Partial and infinite dilution molar partial properties were also calculated. Results focus on complex formation driven by chemical forces. The Jouyban–Acree model predicted these properties, with accuracy assessed using mean relative deviations (MRDs) and individual relative deviations (IRDs). FTIR spectroscopy provided additional insights into intermolecular interactions.