Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/94795
Title: Separation of ionic liquid cations and related imidazole derivatives by α-cyclodextrin modified capillary zone electrophoresis
Authors: Qin, W.
Wei, H.
Sam, F.Y.L. 
Issue Date: 2002
Citation: Qin, W., Wei, H., Sam, F.Y.L. (2002). Separation of ionic liquid cations and related imidazole derivatives by α-cyclodextrin modified capillary zone electrophoresis. Analyst 127 (4) : 490-493. ScholarBank@NUS Repository.
Abstract: The separation and detection of 1-alkyl-3-methylimidazolium, including isomers, and related imidazole derivatives was performed by α-cyclodextrin (α-CD) modified capillary zone electrophoresis. The separations were carried out in a running buffer comprising 5.0 mM triethylamine and 2.0 mM α-CD adjusted to pH 4.5 by acetic acid. All the analytes were baseline separated within 8 min and the detection limits (signal-to-noise ratio = 3) ranged between 0.42 and 1.36 ppm. The method showed good linearity (within 3-50 times the detection limits, r > 0.99) and reproducibility (relative standard deviation < 0.8% for migration times and < 3% for peak areas), which should make it suitable for routine analysis. It was employed in detecting impurities in commercial chemicals, and 0.27% 1-methylimidazole in 1-ethyl-3-methylimidazolium chloride and 0.55% imidazole in 2-ethylimidazole were found. In addition, it was employed in process analysis during synthesis of ionic liquids and demonstrated a potential to provide information on the reaction mechanism.
Source Title: Analyst
URI: http://scholarbank.nus.edu.sg/handle/10635/94795
ISSN: 00032654
Appears in Collections:Staff Publications

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