Kinetic and spectroscopic studies with a rapid-scanning spectrometer. Part 2. Intermediates in the one-equivalent metal ion oxidation of phenothiazine and phenoxazine

Abstract

The one-equivalent oxidations of phenothiazine and phenoxazine (Ar₂NH) in neutral and acidic CH₃CN solution by Ce^IV and Fe^III have been analysed kinetically into the sequence Ar₂NH [graphic omitted] Ar₂NH˙⁺ [graphic omitted] Ar₂N⁺→ product and values (or limits) for the relevant rate constants, including those for the oxidant–cation radical reaction, obtained by stopped-flow or rapid-scanning spectrometry. The latter technique has provided u.v.–visible spectra of all the intermediates involved, of which some are described for the first time.