Synthesis and spectroscopic characterization of cobalt porphyrins and their catalytic activity towards dioxygen reduction

The synthesis and spectroscopic characterization of cobalt（Ⅱ） 5-（4-pyridyl）-10,15,20-triphe-nylporphyrin,cobalt（Ⅱ） 5-（4-N-hexadecylpyridiniumyl）-10,15,20-triphenylporphyrin bromide andcobalt（Ⅱ） 5-（2-aminophenyl）-10,15,20-triphenyl-porphyrin are reported.The corresponding copperand vanadyl derivatives (（TriP）Cu,[（hTriP）Cu]Brand [（hTriP）VO]Br) were also studied.Eachmetalloporphyrin was characterized by UV-visible,ESR andH NMR spectroscopy.These me-talloporphyrins can be firmly adsorbed on the glassy carbon （GC） surface.The catalytic reduction ofdioxygen at GC electrodes modified by these catalysts was studied by cyclic voltammetry （CV）.Thekinetic process of dioxygen reduction at the cobalt porphyrin-modified electrodes was studied with arotating ring disk electrode.