Spectroelectrochemical study of the oxidation of diaminophenols on platinum electrodes in acidic medium

  • H. J. Salavagione /
  • J. Arias-Pardilla /
  • J. L. Vázquez /
  • M. C. Miras /
  • E. Morallón /
  • C. Barbero
Journal ar
Electrochimica Acta
  • Volumen: 50
  • Número: 27
  • Fecha: 20 September 2005
  • Páginas: 5414-5422
  • ISSN: 00134686
  • Source Type: Journal
  • DOI: 10.1016/j.electacta.2005.03.022
  • Document Type: Article
The electrochemical oxidation of 2,3- 2,4- and 2,5-diaminophenol, on platinum electrode, in acid medium was studied using cyclic voltammetry, in situ UV-vis and in situ FTIR spectroscopies. The spectroscopic data indicates that 2,4-diaminophenol suffers hydrolysis giving the formation of 2-amino-hydroquinone/2-amino-p-benzoquinone in solution. The oxidation mechanism of 2,5-diaminophenol is similar to the p-phenylenediamine giving 2-hydroxy-p-benzoquinoneimine and its hydrolysis product, 2-hydroxy-p- benzoquinone. The electrochemical results suggest that 2,3-diaminophenol generates a non-electroactive polymeric material on the electrode surface. © 2005 Elsevier Ltd. All rights reserved.

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