Abstract
Absorption spectra are reported for a series of metalloporphyrin π-radical cations produced by chemical oxidation in CH 2Cl 2. Where the parent metalloporphyrin is diamagnetic, the absorption spectral features of the π-radical cations are similar and there is a good correlation between the energies of the first spin-allowed transitions for the π-radical cation and for the parent porphyrin. In general, this is not the case for π-radical cations derived from paramagnetic metalloporphyrins where the lowest energy spin-allowed transition occurs at higher wavelength than anticipated from the studies with diamagnetic metalloporphyrins.
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