Charakterisierung der gas-chromatographischen trenneigenschaften von N-methylacetamid mittels infrarotspektroskopischer frequenzverschiebungen und selektivitätskoeffizienten : III. Mitt die klassifizierung gas-chromatographischer trennflüssigkeiten und die berechnung von retentionen mittels infrarotspektroskopischer messungen

Abstract

Characterisation of the gas chromatographic separation properties of N-methylamide by means of infrared spectroscopic frequency shifts and selectivity coefficients. III. Classification of gas chromatographic liquid phases and calculation of retention data by means of infrared spectroscopic measurements Relative retention volumes and retention indices are of the greatest value in the case of those gas chromatographic samples which induce the highest frequency shifts in the infrared spectrum of the liquid phase in which the samples are dissolved. A degree of selectivity sufficient for the separation of substances that have the same boiling point can be expected in those cases where there are significant differences in infrared frequency shifts. The infrared spectroscopic measurements, which are simple and can be carried out rapidly, yield experimental values which give information about polar intermolecular forces, activity coefficients and selectivity coefficients in gas chromatographic systems. The frequency shifts are useful both for the choice of selective liquid phases and for the interpretation of gas chromatograms.