Thermodynamic and spectroscopic investigations on binary liquid mixtures containing tri-n-butylamine with 2-alkanols

Experimental thermodynamic and spectroscopic investigations on binary liquid mixtures containing tri-n-butylamine with 2-propanol, 2-butanol and 2-pentanol have been discussed in this article. The aforesaid binary mixtures have been examined over the entire range of composition at a temperature range of 293.15-308.15 K with a temperature step of 5 K and at 0.1 MPa pressure. To explore the mixtures thermodynamically, the density (rho) and speed of sound (u) at various compositions and temperatures have been measured. Experimental values of these two properties have been used to find out various thermodynamic parameters, viz., excess molar volumes (V-m(E)), excess isentropic compressibilities (kappa(E)(s)), apparent molar volumes (V-phi), partial molar volumes ((V) over bar (m)), excess partial molar volumes ((V) over bar (E)(m)) and partial molar volumes at infinite dilution ((V) over bar (E,)(m)infinity). These parameters are analysed in terms of form and degree of unlike interactions. Along with this, these parameters are also examined to figure out the effect of chain length and temperature on interactions. Further, the computed excess parameters have also been correlated with the compositions using the Redlich-Kister-type polynomial. Similar to excess parameters, the density and speed of sound have also been correlated to compositions using the Jouyban-Acree model. Apart from this, the mixtures were also analysed using FTIR spectroscopy studies.