Abstract
In this communication, the authors present results on the synthesis and characterization of a new meso-(5-(4-pyridil) 10,15,20 triphenyl porphyrinate) chloro manganese (III) porphyrin (ClMnP(Ph){sub 3}py) modified with one [(H{sub 2}O)Ru(bpy){sup 2}]{sup 2+} group coordinated with the pyridine on the meso-position of the porphyrin ring. The resulting bimetallic complex was characterized by resonance Raman, IR, far-IR and electronic spectroscopy. Cyclic voltammograms of this monoruthenated porphyrin compound in acetonitrile exhibit three reversible waves at 1.53, 0.96 and 0.03V vs NHE. Spectroelectrochemical experiments were performed in acetonitrile and dimethyl sulfoxide and the results are in agreement with the cyclic voltammetric results. The anodic peak current of the cyclic voltammogram waves of the manganese porphyrin moiety in the monoruthenated compound was suppressed in the presence of atmospheric oxygen. These results provide evidence for an associative process of O{sub 2} with the Mn(III) center of the porphyrin.
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