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Gas chromatography selectivity of new phosphonium‐based dicationic ionic liquid stationary phases
Author(s) -
Patil Rahul A.,
Talebi Mohsen,
Sidisky Leonard M.,
Berthod Alain,
Armstrong Daniel W.
Publication year - 2018
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201800695
Subject(s) - phosphonium , ionic liquid , selectivity , chemistry , imide , gas chromatography , ionic bonding , ionic strength , organic chemistry , chromatography , inorganic chemistry , ion , catalysis , aqueous solution
Three phosphonium‐based dicationic ionic liquids were synthesized as bis(trifluoromethylsulfonyl) imide salts. The three dications had a nonyl spacer between two identical phosphonium‐substituted groups. The three phosphonium moieties were dipropyl(phenyl), diphenyl(propyl), and diphenyl(toluyl). The physicochemical properties of the dicationic ionic liquids were appropriate to prepare 30 m capillary columns that were tested in gas chromatography. A unique selectivity compared to different polysiloxane or polar cyanosiloxane commercial columns was observed for selected mixes of phthalates, polyaromatic hydrocarbons, polychlorobiphenyls, and dioxins. Only minor selectivity variations were observed with the three dicationic ionic liquids. The different number of aromatic rings on the positively charged phosphonium group did not influence the dicationic ionic liquid selectivity significantly.