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Comparison of xenon and carbon dioxide as mobile phases in on‐line SFC‐FTIR: Chromatographic and spectroscopic considerations

1992; Wiley; Volume: 15; Issue: 12 Linguagem: Inglês

10.1002/jhrc.1240151210

1521-4168

Timothy J. Jenkins, G. Davidson, Michael A. Healy, Martyn Poliakoff,

Ionic liquids properties and applications

Abstract Supercritical carbon dioxide and xenon are compared as mobile phases for SFC‐FTIR. Examples are presented illustrating the use of xenon in SFC and it is compared with carbon dioxide for a range of compounds of different polarities. Investigations of the effects of mobile phase temperature and density on infrared spectra measured in supercritical solution are also presented. It has been found that carbon dioxide gives smaller shifts with temperature and density changes than had been reported previously and that carbon dioxide and xenon give rise to remarkably similar effects in almost all circumstances. A comparison of SFC‐FTIR spectra with vapor‐ and condensedphase data is presented and it is shown that such data will require modification to model the effects of the supercritical solvent. The study shows that such modification should be relatively straightforward.