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

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 (rho), speeds of sound (u) and viscosities (eta) 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 (VE), excess isentropic compressibility (kappa sE), viscosity deviation (Delta eta) and excess Gibbs free energy of activation (Delta G*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.