Phase Equilibria Study of \N-Hexylisoquinolinium bis\(trifluoromethyl)sulfonyl\imide + Aromatic Hydrocarbons or an Alcohol\ Binary Systems

Urszula Domańska-Żelazna , Maciej Zawadzki , M. Marc Tshibangu , Deresh Ramjugernath , Trevor M. Letcher


Isoquinolinium ionic liquid (IL) has been synthesized from N-hexylisoquinolinium bromide as a substrate. Specific basic characterization of the synthesized compound is included, which includes NMR spectra, elementary analysis, and water content. The basic thermal properties of the pure IL, that is, melting and solid?solid transition temperatures, as well as the enthalpy of fusion, or solid?solid transition have been measured using a differential scanning microcalorimetry technique. The density and viscosity as a function of temperature have been measured for the pure IL at temperatures higher than the melting temperature and were extrapolated to T = 298.15 K. The temperature?composition phase diagrams of 8 binary mixtures composed of the IL N-hexylisoquinolinium bis\(trifluoromethyl)sulfonyl\imide, ([HiQuin][NTf2]) and an aromatic hydrocarbon (benzene, or toluene, or ethylbenzene, n-propylbenzene) or an alcohol (1-butanol, or 1-hexanol, or 1-octanol, or 1-decanol) have been determined from ambient temperature to the boiling-point temperature of the solvent at ambient pressure. A dynamic method was used over a broad range of mole fractions and temperatures from 270 to 330 K. For the binary systems, the eutectic diagrams were observed with immiscibility in the liquid phase with an upper critical solution temperature (UCST). In the case of the mixture \IL + benzene, or alkylbenzene\ the eutectic systems with mutual immiscibility in the liquid phase with very high UCSTs were observed. These points were not detectable with our method and were observed at low IL mole fraction. For mixtures with alcohols, it was observed that with an increasing chain length of an alcohol, the solubility decreases and the UCST increases. The coexistence curves corresponding to liquid?liquid phase equilibrium boundaries and the solid?liquid phase equilibrium has been correlated using the well-known nonrandom two-liquid (NRTL) model.
Author Urszula Domańska-Żelazna ZChF
Urszula Domańska-Żelazna,,
- Department Of Physical Chemistry
, Maciej Zawadzki ZChF
Maciej Zawadzki,,
- Department Of Physical Chemistry
, M. Marc Tshibangu
M. Marc Tshibangu,,
, Deresh Ramjugernath
Deresh Ramjugernath,,
, Trevor M. Letcher
Trevor M. Letcher,,
Journal seriesJournal of Physical Chemistry B, ISSN 1520-6106
Issue year2011
Languageen angielski
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Score (nominal)35
Publication indicators WoS Impact Factor: 2011 = 3.696 (2) - 2011=4.061 (5)
Citation count*5 (2015-03-08)
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