Electrochemical synthesis of catalytically active linear and cross-linked polyporphyrins

In this work, the electrochemical method was applied to prepare linear and 3D polyporphyrins based on 5,15-di (4-aminophenyl)-10,20-diphenylporphyrin and 5,10,15-tri(4-aminophenyl)-20-phenylporphyrin. The for-mation of polyporphyrins consisted in electrooxidation of porphyrins via the amino-groups of amino-phenyl substituents. Based on the assumed structure of the polyporpyrins, UV-vis spectroscopy data, structure of the porphyrin monomers and comparison of the swelling degrees, it was established that poly-5,15-di(4-amino- phenyl)-10,20-diphenylporphyrin has a linear structure, whereas poly-5,10,15-tri(4-aminophenyl)- 20-phe-nylporphyrin is a cross-linked polymer. The branched cross-linked polyporphyrin obtained from 5,10,15-tri(4- aminophenyl)-20-phenylporphyrin on conductive substrates is much more effective in accelerating the elec-trons, which improves the catalytic characteristics of the oxygen electroreduction catalyst.

Automated summary

In this study, the electrochemical method was used to prepare linear and 3D polyporphyrins based on different substituents. The structure of the polyporphyrins was determined through experimental data, and it was found that the branched cross-linked polyporphyrin obtained on conductive substrates had higher efficiency in electron conduction.