Redox properties of hemiporphycene and isoporphycene - Comparison with those of porphyrin and other porphyrin isomers, porphycene and corrphycene

The electrochemical characteristics are reported for two constitutional iso mers of porphyrin, hemiporphycene and isoporphycene. Each of the two isomer s was studied as the neutral free base, and as metal(II) complexes (M = Ni and Cu). Further these redox characteristics were compared, and found quali tatively similar to those already known for porphyrin and two other isomers , namely corrphycene 4 and porphycene 2, although significant changes were observed in the reduction potentials. (C) 2001 Elsevier Science B.V. All ri ghts reserved.