Kinetic study on the dimerization reaction of 9-methoxyanthracene cation radical by means of fast scan cyclic voltammetry

Koichi Nozaki*, Munetaka Oyama, Hiroyuki Hatano, Satoshi Okazaki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The instrumentation of a fast scan cyclic voltammetric (FSCV) system with a maximum scan rate of 300 kV s and its application to the kinetic studies of very short-lived electrogenerated intermediates are presented. The time resolution of the system was inspected by cyclic voltammetry and chronoamperometry, and was found to be better than 1 μs at an ultramicrodisk electrode (UMDE) of micrometre size. The mechanism and kinetics of the very rapid anodic dimerization of 9-methoxyanthracene (9MeOA) are discussed in further detail for the first time by means of FSCV. The reductive wave of 9MeOA cation radical was detected successfully, although the reversible cyclic voltammogram could not be observed even at a scan rate as high as 300 kV s. It was concluded, from the dependences of the anodic peak potentials on both the scan rate and the substrate concentration, that the dimerization proceeded via coupling of 9MeOA cation radical with the substrate. The dimerization rate constant was estimated to be (3.5± 0.5) × 108 M-1 s-1 from the results of digital simulation analysis of the observed fast scan cyclic voltammograms.

Original languageEnglish
Pages (from-to)191-204
Number of pages14
JournalJournal of Electroanalytical Chemistry
Volume270
Issue number1-2
DOIs
StatePublished - 1989/10/10

ASJC Scopus subject areas

  • Analytical Chemistry
  • General Chemical Engineering
  • Electrochemistry

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