Studies on the separation of alkylbenzenes by gas—liquid chromatography VII. A linear free-energy relationship in the gas—liquid chromatographic separation of alkylbenzenes

Abstract

In the separation of alkylbenzenes by gas—liquid chromatography, a good linear relationship was shown between the logarithm of the relative retention time and the substituent constant (σ) of the alkylbenzenes. The application of Yukawa and Tsuno's equation showed that the additional resonance factor ( r) has a negative value. It may be consistent with these phenomena to conclude that the dipolar interaction between the alkyl group of alkylbenzenes and the liquid phase will play an important role in the gas chromatographic separation. A linear relationship was also shown in the separation of o-dialkylbenzenes.