Abstract
Reported is the chemistry of a new polynuclear cobalt porphyrin complex obtained by complexing the pyridine residues of meso-tetra(4-pyridyl)porphinate cobalt(III) chloride with ruthenium(III)-EDTA ions. The complex exhibited reversible spectroelectrochemical behavior, with two successive redox processes at E°=0.080 and 0.295 V versus SHE associated with the peripheral Ru(III)EDTA and central Co(III) ions, respectively. An enhanced electrocatalytic activity in the reduction of molecular oxygen was observed for the tetrametallated cobalt porphyrin, involving a cooperative effect between the cobalt(III) center and the peripheral Ru(II)-EDTA groups.
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