title: High temperature and highly selective stationary phases of ionic liquid bonded polysiloxanes for gas chromatography.
abstract: Due to the special performance of "dual nature" and synthetic flexibility, ionic liquids (ILs) have been an attractive research subject of stationary phases for gas chromatography (GC). In this work, a novel ionic liquid (IL) bonded polysiloxane ([PSOMIM][NTf₂]) with anion of bis-trifluoromethanesulfonylimide (NTf₂⁻) was synthesized, and another one with chloride anion ([PSOMIM][Cl]) was also prepared for the purpose of comparison. The thermo-stability of the product was evaluated by thermogravimetric (TG) test and the result indicated that [PSOMIM][NTf₂] did not decompose slightly until 380 °C. Then the solvation behaviors of the ILs were characterized using solvation parameter model. Subsequently, [PSOMIM][NTf₂] and [PSOMIM][Cl] were used as stationary phases to prepare capillary columns for GC, respectively. The column efficiency of [PSOMIM][NTf₂] column was 4776 plates/m (k=3.64 ± 0.08, naphthalene), and that of the other one was 3170 plates/m (k=2.84 ± 0.11, naphthalene). The selectivity of the novel stationary phases for analytes, including Grob reagent, aromatic positional isomers was further evaluated. Furthermore, the chromatograms of n-alkanes and polycyclic aromatic hydrocarbons (PAHs) on [PSOMIM][NTf₂] column were compared with that on [PSOMIM][Cl] column. [PSOMIM][NTf₂] stationary phase also exerted good selectivity for fatty acid methyl esters (FAMEs), polychlorinated biphenyls (PCBs) and aromatic amines.
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China.
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Sun
authors.forename: Yuling
authors.initials: Y
authors.lastname: Zhu
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Caiying
authors.initials: C
authors.lastname: Wu
authors.forename: Jun
authors.initials: J
authors.lastname: Xing
mesh_terms: D000473:Alkanes / Q000737:chemistry; D002849:Chromatography, Gas / Q000379:methods*; D006358:Hot Temperature; D006860:Hydrogen Bonding; D007094:Imides / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008956:Models, Chemical; D009281:Naphthalenes / Q000737:chemistry; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry*; D013818:Thermogravimetry
chemical_list: D000473:Alkanes; D007094:Imides; D052578:Ionic Liquids; D009281:Naphthalenes; D011084:Polycyclic Aromatic Hydrocarbons; D012833:Siloxanes; C031721:naphthalene