Excess partial molar enthalpies of 2-(isopropylamino)ethanol in the water at T = 298.15 K

• Published in: Journal of molecular liquids 2021-05, Vol.329, p.115600, Article 115600
• Main Authors: Moita, Maria-Luísa C.J., Nobre, Luís C.S., Santos, Ângela F.S., Lampreia, Isabel M.S.
• Format: Article
• Language: English
• Subjects: 2-(isopropylamino)ethanol (IPAE); Aqueous solutions; Excess partial molar enthalpies; Intermolecular interactions; Solution calorimeter
• ISSN: 0167-7322
• DOI: 10.1016/j.molliq.2021.115600

Direct excess partial molar enthalpies of 2-(isopropylamino)ethanol in the water very-rich region and water in 2-(isopropylamino)ethanol rich-region were obtained, at T = 298.15 K and atmospheric pressure, using a semi-adiabatic isoperibol solution calorimeter. Limiting excess partial molar values of this property, at the two extremes of composition, were estimated and compared with literature values for some other amphiphiles. Enthalpies of the molecular interactions between like molecules, Hii, in the same composition's ranges were also obtained. The interpretation of the results in terms of molecular interactions is supported by the previous volumetric and compressibility studies. •Direct excess partial molar enthalpies values for the system {water +2-(isopropylamino)etanol} are presented.•Exothermic processes were found at both extremes of composition.•Limiting excess partial molar enthlpies were obtained and interpreted.•Intermolecular interactions were assessed using a third order derivative of the Gibbs energy.