Electrochemical Characterization and Metallization of Two Novel Asymmetric Meso-Subtstituted Porphyrins

摘要

Electrochemical characterization and metallization of two novel meso-susbstituted porphyrins werecarried out by sweep and step potential techniques. Redox potentials of 5,10,15-tris(p-chlorophenyl)- 20-(2-hydroxy-3-methoxyphenyl)porphyrin and 5,10,15-tris(p-methoxyphenyl)-20-(p-chlorophenyl)porphyrin were identified, and their respective diffusion coefficients at 25 1 C in CH2Cl2 usingtetrabutylammonium hexafluorophosphate as supporting electrolyte were determined. The dianionradical formation potentials were found to be influenced by the electrodonor effects of the porphyrinsubstituents. The metallization process of the porphyrins were carried out by controlled potentialelectrolysis using an aluminum sacrificial anode to form the metallic ions in situ. The aluminummetalloporphyrin formation of each porphyrin was confirmed by UV-Vis, IR and atomic absorptionspectroscopy.