Abstract
Separation coefficients log γ for substituted halgenobenzene derivatives given by gas-liquid chromatography have been evaluated by regression analysis, using three kinds of descriptors, namely, σs°, μ2/α and Σσ±π. For the orthodisubstituted series, the descriptor Σσ±π, correcting the ortho effect due to the vicinal substituent group, is required. This correction can be achieved by evaluating the intensity drop of the p(1La) band of ultraviolet absorption spectra. The Σσ±π of the regreession equation indicates the contribution of the charge-transfer interactionbetween the substrate and stationary liquid.
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