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Article

Measurements of Activity Coefficients at Infinite Dilution for Organic Solutes in the Ionic Liquids N-Ethyl- and N-Octyl-N-methylmorpholinium Bis(trifluoromethanesulfonyl)imide. A Useful Tool for Solvent Selection

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Department of Physical Chemistry, Faculty of Chemistry, Gdansk University of Technology, Narutowicza Str.11/12, 80-233 Gdansk, Poland
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Department of Analytical Chemistry, Faculty of Chemistry, Gdansk University of Technology, Narutowicza Str.11/12, 80-233 Gdansk, Poland
*
Author to whom correspondence should be addressed.
Academic Editors: Mihkel Koel and Marek Tobiszewski
Molecules 2020, 25(3), 634; https://doi.org/10.3390/molecules25030634
Received: 10 December 2019 / Revised: 28 January 2020 / Accepted: 29 January 2020 / Published: 1 February 2020
In recent years, many papers describing ionic liquids (IL) as promising solvents in separation techniques have been published. The conscious choice of appropriate ionic liquid as absorption media in effective extraction of selected types of analytes requires deeper understanding of the analyte−IL interactions. Therefore, intensive research is conducted to determine the values of activity coefficient at infinite dilution, which allows us to characterize the nature of these interactions. Based on the inverse gas chromatography retention data, activity coefficients at infinite dilution γ 13 of 48 different organic compounds in the ionic liquids N-ethyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide [C2C1Mor][TFSI] and N-octyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide [C8C1Mor][TFSI] were determined. The measurements covered a broad range of volatile organic compounds, including n-alkanes, n-alkenes, n-alkynes, alcohols, aldehydes, ketones, aromatic compounds and common polar solvents, representing different types of interactions. Activity coefficients at infinite dilution were measured in the temperature range from 313.15 to 363.15 K. The excess partial molar enthalpies and entropies at infinite dilution were determined. Selectivity at infinite dilution was also calculated for exemplary separation processes in the hexane/benzene system. The obtained results were analyzed and compared with literature data for ionic liquids containing the same anion [TFSI]¯ and different cations. The study results indicate that some potential applications of the investigated ionic liquids in separation problems exist. View Full-Text
Keywords: ionic liquids; morpholinium ILs; activity coefficient at infinite dilution; inverse gas chromatography; separation techniques ionic liquids; morpholinium ILs; activity coefficient at infinite dilution; inverse gas chromatography; separation techniques
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MDPI and ACS Style

Marcinkowski, Ł.; Eichenlaub, J.; Ghasemi, E.; Polkowska, Ż.; Kloskowski, A. Measurements of Activity Coefficients at Infinite Dilution for Organic Solutes in the Ionic Liquids N-Ethyl- and N-Octyl-N-methylmorpholinium Bis(trifluoromethanesulfonyl)imide. A Useful Tool for Solvent Selection. Molecules 2020, 25, 634. https://doi.org/10.3390/molecules25030634

AMA Style

Marcinkowski Ł, Eichenlaub J, Ghasemi E, Polkowska Ż, Kloskowski A. Measurements of Activity Coefficients at Infinite Dilution for Organic Solutes in the Ionic Liquids N-Ethyl- and N-Octyl-N-methylmorpholinium Bis(trifluoromethanesulfonyl)imide. A Useful Tool for Solvent Selection. Molecules. 2020; 25(3):634. https://doi.org/10.3390/molecules25030634

Chicago/Turabian Style

Marcinkowski, Łukasz, Joachim Eichenlaub, Elham Ghasemi, Żaneta Polkowska, and Adam Kloskowski. 2020. "Measurements of Activity Coefficients at Infinite Dilution for Organic Solutes in the Ionic Liquids N-Ethyl- and N-Octyl-N-methylmorpholinium Bis(trifluoromethanesulfonyl)imide. A Useful Tool for Solvent Selection" Molecules 25, no. 3: 634. https://doi.org/10.3390/molecules25030634

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