Bismuth complexes porphyrins

The bismuth porphyrins studied by the groups of Kadish and Gudard undergo two macrocycle-centered oxidations, and unlike what is observed for the other Group 15 porphyrins, none of the bismuth porphyrins shows evidence for conversion from the M(III) to the M(V) form of the complex. The authors pointed out that the oxidation potentials of (P)Bi(S03Cp3) were rather insensitive to the type of porphyrin macrocycle. 

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