Thermodynamic and spectroscopic properties of binary mixtures of n-butylammonium butanoate ionic liquid with alcohols at T=(293.15–313.15)K

• Published in: The Journal of chemical thermodynamics 2017-02, Vol.105, p.238-252
• Main Authors: Bittencourt, Samara Storion, Hoga, Heloisa Emi, Torres, Ricardo Belchior, d’Angelo, José Vicente Hallak
• Format: Article
• Language: English
• Subjects: 1H NMR, 13C NMR and FTIR spectroscopy; Alcohols; Deviation in isentropic compressibility; Excess molar volume; Ionic liquid
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2016.09.007

•Binary mixtures of {n-butylammonium butanoate ionic liquid (N4Bu)+alcohols}.•Volumetric and acoustic properties were determined.•1H NMR, 13C NMR and FTIR spectroscopy techniques were studied.•Temperature range was T=(293.15–313.15)K. In this work, density and speed of sound of binary mixtures of {n-butylammonium butanoate ionic liquid (N4Bu)+alcohols (methanol, ethanol, 1-propanol, 1-butanol and 1-pentanol)} have been measured as a function of composition at T=(293.15–313.15)K and atmospheric pressure. The results were used to calculate the excess molar volume, VmE, and deviation in isentropic compressibility, ΔκS, and correlated to the Redlich-Kister polynomial equation. N4Bu was synthesized by the method of acid-base neutralization reaction using n-butylamine and butanoic acid, and characterized using 1H NMR, 13C NMR and FTIR spectroscopy techniques. For all systems studied, the values of excess molar volumes and deviations in isentropic compressibility were negative over the entire composition range. The results obtained were discussed in terms of structural effects and intermolecular interactions between like and unlike molecules.