Abstract
The reduction of O 2, by Ru(NH 3) 2+ 6 is catalyzed by the water soluble cobalt porphyrin CoTMPyP (TMPyP = tetrakis(4-N-methylpyridyl porphyrin) and by colloidal dispersions on silica of two insoluble cobalt porphyrins, CoTPP (TPP = tetraphenylporphyrin), and Co 2FTF4, a cofacial dicobalt porphyrin. The kinetic behavior exhibited by the soluble porphyrin and the finely divided colloidal dispersions is similar. Dispersion of the insoluble porphyrins on high area silica colloids effectively “solubilizes” them. Amperometric titration of both the dissolved and the colloidally dispersed cobalt porphyrins before and after they are exposed to O 2 allows the stable products of their reactions with O 2 to be established. The relevance of the results to the mechanisms by which these cobalt porphyrins serve as catalysts for the reduction of O 2 is discussed.
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