TY - JOUR
T1 - Cyclic and normal pulse voltammetric studies of 2,3,6,7,10,11-hexaphenylhexazatriphenylene using a benzonitrile thin layer-coated glassy carbon electrode
AU - Wang, Rong
AU - Okajima, Takeyoshi
AU - Kitamura, Fusao
AU - Matsumoto, Naoki
AU - Thiemann, Thies
AU - Mataka, Shuntaro
AU - Ohsaka, Takeo
PY - 2003/9/4
Y1 - 2003/9/4
N2 - 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.
AB - 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.
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U2 - 10.1021/jp0305281
DO - 10.1021/jp0305281
M3 - Article
AN - SCOPUS:0141794668
SN - 1520-6106
VL - 107
SP - 9452
EP - 9458
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 35
ER -