On the One and Two-Electron Oxidations of Water-Soluble Zinc Porphyrins in Aqueous Media
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چکیده
The one and two-electron oxidations of water soluble ionic zinc porphyrins (Zinctetramethylpyridylporphyrin, ZnTMPyP, Zinc-tetra-p-sulfonato-phenyl-porphyrin, ZnTPPS, and Zinc-tetra-p-carboxy-phenylporphyrin, ZnTPPC) leading to the porphyrin /7-cations and /7-dications have been investigated in water by electrochemical (cyclic voltammetry and controlled potential electrolysis) and chemical methods. The half-wave potentials for the oxidation are shown to be markedly dependent on the charge on the /?-substituents. While the one-electron oxidations for all these porphyrins are reversible, the dication formation leads to labile isoporphyrins as intermediates.
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تاریخ انتشار 2012