Ionic liquids are a class of nonmolecular ionic solvents with low melting points.  These liquids are unique combination of cations and anions and can provide a variety of different selectivities when used as stationary phases in capillary gas chromatography.  The majority of the polyionic ionic liquid phases that we have been evaluating all provide polar and highly polar selectivities similar to polyethylene glycol based or biscyanopropylpolysiloxane phases. These phases will provide unique selectivity for the evaluation of a number of chemical compounds. The purpose of our studies is to determine the effects changing the cation and spacer groups on the selectivity and stability of the phases. Selectivity was determined and compared using various isothermal and temperature programmed test mixes. Particular cation and anion combinations appear to provide very unique selectivity by the shifting of normal alkanes relative to aromatic and other chemical species. We will also demonstrate the effects of the various functional group combinations on the overall stability of the ionic liquid stationary phases.

Investigation of polyionic ionic liquid stationary phases for capillary gas chromatography

247th National Meeting (2014)

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