Abstract
The oxidation of tetraphenylporphinatozinc has been examined in dichloroethane or dichloromethane solutions in the presence of nitrate, trifluoroacetate, or methanol by dc, ac, and thin layer voltammetry, and by thin layer visible and FTIR spectroelectrochemistry. Data is also presented for oxidation of tetraphenylporphine in dichloroethane saturated with water, and of chloro(tetraphenylporphinato)manganese(III) in dry dichloroethane. In all of these cases, isoporphyrin formation is indicated after the removal of two electrons from the porphyrin ring. The isoporphyrin undergoes one-electron oxidation at more positive potentials, and can be reduced with two electrons back to starting material. Two competing mechanisms are indicated for the isoporphyrin reduction.
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