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Gas chromatography selectivity of new phosphonium-based dicationic ionic liquid stationary phases
Rahul A Patil1, Mohsen Talebi1, Leonard M Sidisky2
1Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, TX, USA.
Journal of Separation Science
|September 28, 2018
Summary
Three novel phosphonium-based dicationic ionic liquids were synthesized and tested as gas chromatography capillary columns. These ionic liquids exhibited unique selectivity for analyzing phthalates, polyaromatic hydrocarbons, and other persistent organic pollutants.
Area of Science:
- Analytical Chemistry
- Separation Science
- Materials Science
Background:
- Ionic liquids offer tunable properties for advanced separation techniques.
- Developing novel stationary phases for gas chromatography is crucial for analyzing complex mixtures.
- Phosphonium-based ionic liquids present unique structural characteristics.
Purpose of the Study:
- To synthesize and characterize novel phosphonium-based dicationic ionic liquids.
- To evaluate their performance as stationary phases in 30 m capillary gas chromatography columns.
- To assess their selectivity for challenging analytes like phthalates, polyaromatic hydrocarbons, polychlorobiphenyls, and dioxins.
Main Methods:
- Synthesis of three phosphonium-based dicationic ionic liquids with varying phosphonium substituents (dipropyl(phenyl), diphenyl(propyl), diphenyl(toluyl)) and a nonyl spacer.
- Preparation of 30 m capillary gas chromatography columns using the synthesized ionic liquids.
- Gas chromatographic analysis of selected mixtures of phthalates, polyaromatic hydrocarbons, polychlorobiphenyls, and dioxins.
- Comparison of selectivity with commercial polysiloxane and cyanosiloxane columns.
Main Results:
- The synthesized dicationic ionic liquids demonstrated suitable physicochemical properties for gas chromatography column preparation.
- Unique selectivity profiles were observed for the target analytes compared to conventional columns.
- Minor variations in selectivity were noted among the three dicationic ionic liquids.
- The number of aromatic rings on the phosphonium group did not significantly impact the overall selectivity.
Conclusions:
- Novel phosphonium-based dicationic ionic liquids can serve as effective stationary phases in gas chromatography.
- These ionic liquids offer distinct separation capabilities for persistent organic pollutants.
- The structural variations explored had a limited effect on selectivity, suggesting robustness in their application.
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