title: Influence of Fluorination on the Solubilities of Carbon Dioxide, Ethane, and Nitrogen in 1-n-Fluoro-alkyl-3-methylimidazolium Bis(n-fluoroalkylsulfonyl)amide Ionic Liquids.
abstract: The effect on gas solubilities of adding partially fluorinated alkyl side chains either on imidazolium-based cations or on bis(perfluoroalkylsulfonyl)amide anions was studied. The aim was to gain knowledge of the mechanisms of dissolution of gases in fluorinated ionic liquids and, if possible, to improve physical absorption of carbon dioxide in ionic liquids. We have determined experimentally, in the temperature range of 298-343 K and at pressures close to atmospheric pressure, the solubility and thermodynamics of solvation of carbon dioxide, ethane, and nitrogen in the ionic liquids 1-octyl-3-methylimidazolium bis[trifluoromethylsulfonyl]amide ([C8mim][NTf2]), 1-octyl-3-methylimidazolium bis[pentafluoroethylsulfonyl]amide ([C8mim][BETI]), 1-(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)-3-methylimidazolium bis[trifluoromethylsulfonyl]amide ([C8H4F13mim][NTf2]), and 1-(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)-3-methylimidazolium bis[pentafluoroethylsulfonyl]amide ([C8H4F13mim][BETI]). Ionic liquids with partial fluorination on the cation were found to exhibit higher carbon dioxide and nitrogen mole fraction solubilities but lower ethane solubilities, compared to those of their hydrogenated counterparts. Molecular simulation provided insights about the mechanisms of solvation of the different gases in the ionic liquids.
authors.affiliation: Institut de Chimie de Clermont-Ferrand, CNRS and Université Blaise Pascal , 24 Avenue Blaise Pascal, 63178 Aubiere, France.
authors.forename: D
authors.initials: D
authors.lastname: Almantariotis
authors.affiliation: Institut de Chimie de Clermont-Ferrand, CNRS and Université Blaise Pascal , 24 Avenue Blaise Pascal, 63178 Aubiere, France.
authors.forename: A S
authors.initials: AS
authors.lastname: Pensado
authors.affiliation: QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University of Belfast , Stranmillis Road, Belfast BT9 5AG, U.K.
authors.forename: H Q N
authors.initials: HQ
authors.lastname: Gunaratne
authors.affiliation: QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University of Belfast , Stranmillis Road, Belfast BT9 5AG, U.K.
authors.forename: C
authors.identifier: 0000-0001-7256-6765
authors.initials: C
authors.lastname: Hardacre
authors.forename: A A H
authors.initials: AA
authors.lastname: Pádua
authors.affiliation: Institut de Chimie de Clermont-Ferrand, CNRS and Université Blaise Pascal , 24 Avenue Blaise Pascal, 63178 Aubiere, France.
authors.forename: J-Y
authors.initials: JY
authors.lastname: Coxam
authors.affiliation: Institut de Chimie de Clermont-Ferrand, CNRS and Université Blaise Pascal , 24 Avenue Blaise Pascal, 63178 Aubiere, France.
authors.forename: M F
authors.identifier: 0000-0001-8637-6057
authors.initials: MF
authors.lastname: Costa Gomes