Physico-chemical properties and phase behaviour of piperidinium-based ionic liquids

Urszula Domańska-Żelazna , Marta Królikowska , Kamil Paduszyński


The sufficient review of the existing literature of the 1-alkyl-1-methylppiperidinium-based ionic liquids has been presented. The phase diagrams for the binary systems of \1-butyl-1-methylpiperidinium thiocyanate [BMPIP][SCN] + an alcohol (1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, 1-decanol, 1-dodecanol), or + water, or + aliphatic hydrocarbons (n-hexane, n-heptane, n-octane), or + cyclohexane, or, + cycloheptane, or + aromatic hydrocarbons (benzene, toluene, ethylbenzene)\ and for the binary systems of \1-ethyl-1-methylpiperidinium bis\(trifluoromethyl)sulfonyl\imide [EMPIP][NTf2] + an alcohol (ethanol, 1-propanol, 1-butanol, 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol), or + water\ have been determined at atmospheric pressure using a dynamic method. The influence of an alcohol chain length was discussed for these ionic liquids. A systematic decrease in the solubility was observed with an increase of the alkyl chain length of an alcohol. (Solid + liquid) phase equilibria with complete miscibility in the liquid phase region were observed for the systems involving water and the alcohols for the thiocyanate-based ionic liquid. Opposite, the bis\(trifluoromethyl)sulfonyl\imide-based ionic liquid reveal the immiscibility gap in the liquid phase. The correlation of the experimental data has been carried out using the NRTL equation. The phase diagrams reported here have been compared to the systems published earlier with the 1-alkyl-1-methylpiperidinium-based ionic liquids. The influence of the cation and anion on the phase behaviour has been discussed. The basic thermal properties of pure ILs, i.e. melting temperature and the enthalpy of fusion, the solid–solid phase transition temperature and enthalpy have been measured using a differential scanning microcalorimetry technique.
Author Urszula Domańska-Żelazna ZChF
Urszula Domańska-Żelazna,,
- Department Of Physical Chemistry
, Marta Królikowska ZChF
Marta Królikowska,,
- Department Of Physical Chemistry
, Kamil Paduszyński ZChF
Kamil Paduszyński,,
- Department Of Physical Chemistry
Journal seriesFluid Phase Equilibria, ISSN 0378-3812
Issue year2011
Keywords in English1-Butyl-1-methylpiperidinium thiocyanate, 1-Ethyl-1-methylpiperidinium bis\(trifluoromethyl)sulfonyl\imide, Alcohols, Correlation, Differential scanning microcalorimetry, Hydrocarbons, Prediction, (Solid, or liquid + liquid) phase equilibria, water
Languageen angielski
1-s2.0-S0378381210006138-main.pdf 563.08 KB
Score (nominal)35
Publication indicators WoS Impact Factor: 2011 = 2.139 (2) - 2011=2.225 (5)
Citation count*30 (2015-03-08)
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