The influence of ionization on the ultraviolet spectra of chlorinated phenoxyacetic acids and related phosphorus analogues

Abstract

Ionization has been shown to influence the ultraviolet spectra of compounds of the general type Ph-O-CH₂-X, where X is an ionizable group. It is suggested that this influence arises from an inductive effect of the charge on the electronic interaction between the aromatic ring and the phenolic oxygen atom. The ionization effect can be used to determine the dissociation constants of such compounds spectroscopically.