Cobalt octaethyltetrapyrazinoporphyrazine: Spectroscopy, and electrocatalytic and kinetic study of dioxygen reduction at a glassy carbon electrode

Shaojun Dong, Baifeng Liu, Junli Liu, Nagao Kobayashi

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)333-340
Number of pages8
JournalJournal of Porphyrins and Phthalocyanines
Volume1
Issue number4
DOIs
Publication statusPublished - 1997 Oct

Keywords

  • Cobalt
  • Electrocatalytic reduction
  • Glassy carbon
  • Molecular orbital calculation
  • Octaethyltetrapyrazinoporphyrazine
  • Oxygen
  • Spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)

Fingerprint Dive into the research topics of 'Cobalt octaethyltetrapyrazinoporphyrazine: Spectroscopy, and electrocatalytic and kinetic study of dioxygen reduction at a glassy carbon electrode'. Together they form a unique fingerprint.

Cite this