Abstract
The electron spin resonance spectra of the semiquinone radicals derived from hydroquinone and catechol have been studied in aqueous solutions of varying ph in a rapid flow system. The spectra were found to change drastically with ph; these effects are attributed to protonation of the semiquinones at rates which are dependent on the ph. Models for the systems are proposed, and the effects of exchange are described by means of the modified Bloch equations. Estimates are made of the rate constants and equilibrium constants for protonation of the semiquinone radicals and limits are set for the rate of hydroxyl proton exchange between the radical species and solvent in the low ph region.
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