Journal
JOURNAL OF SEPARATION SCIENCE
Volume 29, Issue 17, Pages 2625-2634Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.200600200
Keywords
cluster analysis; ionic liquid cations; interaction types; reversed-phase high performance chromatography; stationary phase
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Chromatographic analysis of ionic liquids on different types of packings offers interesting possibility to determine their retention mechanism. As a consequence, the major interactions between stationary phase ligands and analyzed chemical entities can be defined. The main aim of this work was to analyze cations of ionic liquids on chemically bonded stationary phases with specific structural properties. The attempt to predict the main interactions between positive ions of ionic liquids and stationary phase ligands was undertaken. For that purpose, butyl, octyl, octadecyl, phenyl, aryl, mixed, alkylamide, and cholesterolic packings were chosen and applied to the analysis of six most commonly used ionic liquids' cations. Obtained results indicate mainly dispersive and pi-pi type of interaction part in the retention mechanism of analyzed compounds.
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