Synthesis of coordination polymers of cobalt meso-pyridylporphyrins and its oxygen reduction properties

Abstract

The present work sheds light on the role of coordinating side groups on the porphine ring in deciding the extent of the metalation reaction as well as the formation of coordination polymers of porphyrin. Electrocatalytic activity of coordination polymers of isomers of pyridylporphyrins has been investigated after pyrolysing them at different temperatures. The pyrolysed materials were characterized by XRD, XPS, SEM, TEM and BET techniques. The electrocatalytic behaviour of the sample were investigated by modifying the glassy carbon electrode with the sample (in both normal and pyrolysed form). The electrode modified using the pyrolysed sample of polymerized pyridylporphyrin at 800 °C acted as a good electrocatalyst for the reduction of dioxygen. The studies on kinetics of oxygen reduction using rotating disk electrode shows the reduction through 2-electron pathway forming H2O2 in alkaline medium.