TY - JOUR
T1 - Cobalt octaethyltetrapyrazinoporphyrazine
T2 - Spectroscopy, and electrocatalytic and kinetic study of dioxygen reduction at a glassy carbon electrode
AU - Dong, Shaojun
AU - Liu, Baifeng
AU - Liu, Junli
AU - Kobayashi, Nagao
PY - 1997/10
Y1 - 1997/10
N2 - Cobalt octaethyltetrapyrazinoporphyrazine was synthesized and characterized by electronic absorption and magnetic circular dichroism spectroscopy. These spectroscopies and molecular orbital calculations within the framework of the Pariser-Parr-Pople approximation revealed that the effective π-conjugation system of octaethyltetrapyrazinoporphyrazine is smaller than phthalocyanines. For the first time, the electrochemical behaviour of cobalt octaethyltetrapyrazinoporphyrazine irreversibly adsorbed onto a glassy carbon electrode as a surface modifier is reported. The cobalt derivative/glassy carbon electrode showed catalytic activity for oxygen reduction. Surprisingly, the peak potentials for oxygen reduction at this electrode coincide well with those where CoII is reduced to CoI over the whole pH range, indicating that the active species for dioxygen reduction is CoI rather than the CoII species. A possible mechanism for the electrocatalysis of oxygen is discussed.
AB - Cobalt octaethyltetrapyrazinoporphyrazine was synthesized and characterized by electronic absorption and magnetic circular dichroism spectroscopy. These spectroscopies and molecular orbital calculations within the framework of the Pariser-Parr-Pople approximation revealed that the effective π-conjugation system of octaethyltetrapyrazinoporphyrazine is smaller than phthalocyanines. For the first time, the electrochemical behaviour of cobalt octaethyltetrapyrazinoporphyrazine irreversibly adsorbed onto a glassy carbon electrode as a surface modifier is reported. The cobalt derivative/glassy carbon electrode showed catalytic activity for oxygen reduction. Surprisingly, the peak potentials for oxygen reduction at this electrode coincide well with those where CoII is reduced to CoI over the whole pH range, indicating that the active species for dioxygen reduction is CoI rather than the CoII species. A possible mechanism for the electrocatalysis of oxygen is discussed.
KW - Cobalt
KW - Electrocatalytic reduction
KW - Glassy carbon
KW - Molecular orbital calculation
KW - Octaethyltetrapyrazinoporphyrazine
KW - Oxygen
KW - Spectroscopy
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U2 - 10.1002/(SICI)1099-1409(199710)1:4<333::AID-JPP40>3.3.CO;2-W
DO - 10.1002/(SICI)1099-1409(199710)1:4<333::AID-JPP40>3.3.CO;2-W
M3 - Article
AN - SCOPUS:0001404116
VL - 1
SP - 333
EP - 340
JO - Journal of Porphyrins and Phthalocyanines
JF - Journal of Porphyrins and Phthalocyanines
SN - 1088-4246
IS - 4
ER -