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Article
High-Stability Ionic Liquids. A New Class of Stationary Phases for Gas Chromatography
Analytical Chemistry
  • Jared L. Anderson, Iowa State University
  • Daniel W. Armstrong, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
8-12-2003
DOI
10.1021/ac0345749
Abstract
Room-temperature ionic liquids are a class of nonmolecular ionic solvents with low melting points. Their properties have the potential to be especially useful as stationary phases in gas−liquid chromatography (GLC). A series of common ionic liquids were evaluated as GLC stationary phases. It was found that many of these ionic liquids suffer from low thermal stability and possess unfavorable retention behavior for some classes of molecules. Two new ionic liquids were engineered and synthesized to overcome these drawbacks. The two new ionic liquids (1-benzyl-3-methylimidazolium trifluoromethanesulfonate and 1-(4-methoxyphenyl)-3-methylimidazolium trifluoromethanesulfonate) are based on “bulky” imidazolium cations with trifluoromethanesulfonate anions. Their solvation characteristics were evaluated using the Abraham solvation parameter model and correlations made between the structure of the cation and the degree to which the ionic liquids retain certain analytes. The new ionic liquids have good thermal stability up to 260 °C, provide symmetrical peak shapes, and because of their broad range of solvation-type interactions, exhibit dual-nature selectivity behavior. In addition, the ionic liquid stationary phases provided different retention behavior for many analytes compared to a commercial methylphenyl polysiloxane GLC stationary phase. This difference in selectivity is due to the unique solvation characteristics of the ionic liquids and makes them very useful as dual-nature GLC stationary phases.
Comments

Reprinted (adapted) with permission from Analytical Chemistry 75 (2003): 4851, doi: 10.1021/ac0345749. Copyright 2003 American Chemical Society.

Copyright Owner
American Chemical Society
Language
en
File Format
application/pdf
Citation Information
Jared L. Anderson and Daniel W. Armstrong. "High-Stability Ionic Liquids. A New Class of Stationary Phases for Gas Chromatography" Analytical Chemistry Vol. 75 Iss. 18 (2003) p. 4851 - 4858
Available at: http://works.bepress.com/jared_anderson/18/