Issue 2, 1986

One- and two-electron oxidation of lead(II) tetrakis (N-methylpyridyl)porphyrins in aqueous solution

Abstract

In aqueous solution at pH 9, lead(II) tetrakis(N-methylpyridyl)porphyrins are oxidised rapidly to the metalloporphyrin π-radical cations by Br˙–2, under pulse radiolytic conditions. The π-radical cations disproportionate at a rate close to the diffusion-controlled limit. The doubly oxidised metalloporphyrin so formed can be assigned to the lead(IV) porphyrin, on the basis of absorption spectroscopy. These highly oxidised metalloporphyrins decay via first-order kinetics (k= 0.93 ± 0.05 s–1) at pH 9. Even in the presence of colloidal RuO2·2H2O, this decay process does not oxidise water to O2.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans. 2, 1986,82, 201-207

One- and two-electron oxidation of lead(II) tetrakis (N-methylpyridyl)porphyrins in aqueous solution

M. Richoux, P. Neta and A. Harriman, J. Chem. Soc., Faraday Trans. 2, 1986, 82, 201 DOI: 10.1039/F29868200201

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