Cyclic and normal pulse voltammetric studies of 2,3,6,7,10,11-hexaphenylhexazatriphenylene using a benzonitrile thin layer-coated glassy carbon electrode

Rong Wang, Takeyoshi Okajima, Fusao Kitamura, Naoki Matsumoto, Thies Thiemann, Shuntaro Mataka, Takeo Ohsaka

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The method of interposing a thin layer of immiscible organic solvent (benzonitrile, BN) between a glassy carbon electrode surface and an aqueous solution has been successfully applied to study the electrode reaction of a highly hydrophobic organic molecule, 2,3,6,7,10,11-hexaphenylhexazatriphenylene (HAT). Four couples of well-defined redox peaks of HAT were observed at the BN thin layer-coated electrode in N2-saturated 2 M HClO4 aqueous solution. By cyclic voltammetry, square-wave voltammetry, and normal pulse voltammetry, the thermodynamic and kinetic parameters (i.e., the formal potential, standard rate constant, and cathodic transfer coefficient) for the multistep redox reaction of HAT and its diffusion coefficient were evaluated. The good agreement between the observed normal pulse voltammograms and the calculated one with use of the obtained kinetic and thermodynamic parameters demonstrated that the evaluated parameters are reasonable and that the present approach is useful in the kinetic study of the multistep redox reaction of hydrophobic reactants. A probable reaction mechanism for the whole redox reaction of HAT was also proposed.

Original languageEnglish
Pages (from-to)9452-9458
Number of pages7
JournalJournal of Physical Chemistry B
Volume107
Issue number35
DOIs
Publication statusPublished - Sep 4 2003
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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