Voltammetric and in situ FTIRS study of the electrochemical oxidation of aniline from aqueous solutions buffered at pH 5

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Title: Voltammetric and in situ FTIRS study of the electrochemical oxidation of aniline from aqueous solutions buffered at pH 5
Authors: Cases Iborra, Francisco Javier | Huerta Arráez, Francisco | Garcés, Pedro | Morallon, Emilia | Vázquez Picó, José Luis
Research Group/s: Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Departamento de Ingeniería de la Construcción, Obras Públicas e Infraestructura Urbana | Universidad Politécnica de Valencia. Departamento de Ingeniería Textil y Papelera
Keywords: Cyclic voltammetry | FTIR spectroscopy | Aniline oxidation | Dimerisation products | Polycrystalline platinum
Knowledge Area: Química Física
Date Created: 5-Dec-2000
Issue Date: 23-Mar-2001
Publisher: Elsevier
Citation: CASES IBORRA, Francisco Javier, et al. "Voltammetric and in situ FTIRS study of the electrochemical oxidation of aniline from aqueous solutions buffered at pH 5". Journal of Electroanalytical Chemistry. Vol. 501, Issues 1-2 (23 March 2001). ISSN 0022-0728, pp. 186-192
Abstract: The electrochemical oxidation of aniline at low concentration was carried out in phosphate buffer solutions of pH 5. Both electrochemical and spectroscopic results indicate that during the initial stages of aniline oxidation, a dimerisation process takes place. The dimer has been identified as p-aminodiphenylamine (ADPA). No evidence supporting the formation of other dimerisation products, such as benzidine or hydrazobenzene has been found. The hydrolysis of ADPA seems to be a very slow process at pH 5 and, consequently, the formation of hydroquinone/p-benzoquinone has not been observed. ADPA is poorly soluble in aqueous medium and a part of these species precipitates on the electrode surface when formed. This precipitated dimer could act as an active centre for the further growth of the polymeric chains.
Sponsor: Ministerio de Educación y Cultura (PB97-0130)
URI: http://hdl.handle.net/10045/7808
ISSN: 0022-0728
DOI: 10.1016/S0022-0728(00)00526-X
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/S0022-0728(00)00526-X
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