Characterization of phosphonium ionic liquids through a linear solvation energy relationship and their use as GLC stationary phases |
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Authors: | Zachary S Breitbach Daniel W Armstrong |
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Institution: | (1) Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium Place, P.O. Box 19065, Arlington, TX 76019, USA |
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Abstract: | In recent years, room temperature ionic liquids (RTILs) have proven to be of great interest to analytical chemists. One important
development is the use of RTILs as highly thermally stable GLC stationary phases. To date, nearly all of the RTIL stationary
phases have been nitrogen-based (ammonium, pyrrolidinium, imidazolium, etc.). In this work, eight new monocationic and three
new dicationic phosphonium-based RTILs are used as gas–liquid chromatography (GLC) stationary phases. Inverse gas chromatography
(GC) analyses are used to study the solvation properties of the phosphonium RTILs through a linear solvation energy model.
This model describes the multiple solvation interactions that the phosphonium RTILs can undergo and is useful in understanding
their properties. In addition, the phosphonium-based stationary phases are used to separate complex analyte mixtures by GLC.
Results show that the small differences in the solvent properties of the phosphonium ILs compared with ammonium-based ILs
will allow for different and unique separation selectivities. Also, the phosphonium-based stationary phases tend to be more
thermally stable than nitrogen-based ILs, which is an advantage in many GC applications. |
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Keywords: | Phosphonium Ionic liquids Characterization Gas chromatography Stationary phases Thermal stability |
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