Metal (Co, Fe) tribenzotetraazachlorin-fullerene conjugates: Impact of direct π-bonding on the redox behaviour and oxygen reduction reaction

Kenneth I. Ozoemena, Solomon A. Mamuru, Takamitsu Fukuda, Nagao Kobayashi, Tebello Nyokong

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Novel hexabutylsulphonyltribenzotetraazachlorin-fullerene (C60) complexes of iron (FeHBSTBTAC-C60) and cobalt (CoHBSTBTAC-C60) have been synthesized and their electrochemistry and oxygen reduction reaction (ORR) compared with their octabutylsulphonylphthalocyanine analogues (FeOBSPc and CoOBSPc). It is proved that electron-withdrawing substituents (-SO2Bu and C60) on phthalocyanine macrocycle exhibit distinct impact on the solution electrochemistry of these metallophthalocyanine (MPc) complexes. The more electron-withdrawing C60 substituent suppressed ORR compared to the -SO2Bu in alkaline medium. FeOBSPc showed the best ORR activity involving a direct 4-electron mechanism, a rate constant of ∼1 × 108 cm3 mol-1 s-1 and a Tafel slope of -171 mV dec-1.

Original languageEnglish
Pages (from-to)1221-1225
Number of pages5
JournalElectrochemistry Communications
Volume11
Issue number6
DOIs
Publication statusPublished - 2009 Jun 1

Keywords

  • Cyclic voltammetry
  • Metal (Fe, Co) phthalocyanine-C
  • Oxygen reduction
  • RDE experiment

ASJC Scopus subject areas

  • Electrochemistry

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