Measurements of the solubility parameter and enthalpies of vaporization in N-alkyl-pyridinium bis((trifluoromethyl)sulfonyl)imide ([CnPY][NTF2], n = 4,6,8) ionic liquid

Aprotic Ionic Liquids: A Framework for Predicting Vaporization Thermodynamics

“…The necessary details are presented in the Supporting Information . Ban et al [ 26 ] used this method and reported the vaporization enthalpies, (298.15 K), of [1-C n -Py][NTf 2 ] with alkyl chain n = 4,6 and 8), which are compiled in Table 4 and they appear to be reasonable, in comparison to other methods. We used the original data for for [4-Me-1-C 4 -Py][NTf 2 ], measured by Domanska and Marciniak [ 30 ], and derived, (298.15 K) = 135.7 ± 3.0 kJ⋅mol −1 (see Table 5 ), which meets the level expectation.…”

Inverse Gas Chromatography: Effects of the Experimental Temperature and Molecular Structure on the Solubility Parameters of 1-Alkyl-3-methylimidazolium Hydrogen Sulfate ([CnMIM][HSO4], n = 4, 6, and 8)

“…The values of χ 12 ∞ of the solutes were calculated by using eq ; the results are shown in Table S2. Theoretically, χ 12 ∞ < 0.5 for good solvents, 0.5 < χ 12 ∞ < 1 for moderate solvents, and χ 12 ∞ > 1 for poor solvents . As shown in Figures – , it can be seen that the solvents dichloromethane, chloroform, thiophene, methanol, ethanol, propanol, butanol, and acetonitrile are good solvents and can dissolve the tested ILs well, while n -alkanes (C 6 –C 10 ), octene, ether, butyl ether, carbon disulfide, tetrahydrofuran, and esters are poor solvents for the three ILs.…”

“…The Flory–Huggins interaction parameter plays a significant role in predicting the thermodynamic states of ILs, such as miscibility with solvent and swelling of the partial solid blending with another ILs . The values of χ 12 ∞ of the solutes were calculated by using eq ; the results are shown in Table S2.…”

“…IGC experiments were conducted by using a commercial gas chromatograph Shimadzu QP2010 with a flame ionization detector (FID). High-purity nitrogen was used as the carrier gas. ,,− The flow rate of nitrogen was adjusted to obtain adequate retention times, which are gauged by using a soap bubble flow meter at room temperature. The injector and detector temperatures were maintained at 523.15 K. The column temperatures were maintained at 303.15, 313.15, 323.15, 333.15, and 343.15 K. Each solute was measured three times to ensure data accuracy.…”

“…The thermodynamic functions at infinite dilution can be determined as a function of temperature and split to its respective enthalpy, Δ H 1 E , ∞ , and entropy, Δ S 1 E , ∞ , components: , where Δ H 1 E , ∞ and Δ S 1 E , ∞ can be obtained from the slope and the intercept, respectively, the partial molar excess Gibbs free energy at infinite dilution (Δ G 1 E , ∞ ) can be calculated from the equation (Δ G 1 E , ∞ = Δ H 1 E , ∞ – T Δ S 1 E , ∞ ). , …”