Analytical Sciences

Electrochemiluminescence of N-(4-Aminobutyl)-N-ethylisoluminol Investigated by Electrochemical Impedance Spectroscopy

Masayuki ITAGAKI, Takahiro KIKUCHI and Kunihiro WATANABE

Department of Industrial Chemistry, Faculty of Science and Technology, Science University of Tokyo, Noda, Chiba, 278-8510, Japan

The electrochemiluminescence (ECL) of N-(4-Aminobutyl)-N-ethylisoluminol (ABEI) in a hydrogen peroxide solution was investigated by electrochemical techniques in the frequency domain. Parallel Pt wire electrodes in a flow-type spiral cell were used for ECL measurements. A superoxide ion, O₂^-, was generated by electrooxidation on Pt, and ABEI fluoresced by a reaction with O₂^-. An ECL impedance L, which is the ratio of the luminescence amplitude to the current in the frequency domain, is proposed in the present paper. The theoretical expression of L was derived to be L=a₁/(1+jw/k), where a₁ is a constant and k is the reaction rate constant of ABEI and O₂^- . By comparing the above equation with the experimental results, the rate constant k was determined. (Keywords: Electrochemical luminescence, electrochemical impedance spectroscopy, electrochemiluminescence impedance, N-(4-aminobutyl)-N-ethylisoluminol)

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