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dc.contributor.author
Planes, Gabriel Angel  
dc.contributor.author
Rodríguez, J. L.  
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Miras, Maria Cristina  
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García, G.  
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Pastor, E.  
dc.contributor.author
Barbero, César Alfredo  
dc.date.available
2023-08-28T10:46:31Z  
dc.date.issued
2010-02  
dc.identifier.citation
Planes, Gabriel Angel; Rodríguez, J. L.; Miras, Maria Cristina; García, G.; Pastor, E.; et al.; Spectroscopic evidence for intermediate species formed during aniline polymerization and polyaniline degradation; Royal Society of Chemistry; Physical Chemistry Chemical Physics; 12; 35; 2-2010; 10584-10593  
dc.identifier.issn
1463-9076  
dc.identifier.uri
http://hdl.handle.net/11336/209460  
dc.description.abstract
Spectroscopic methods are used to investigate the formation of low molecular mass intermediates during aniline (ANI) oxidation and polyaniline (PANI) degradation. Studying ANI anodic oxidation by in situ Fourier transform infrared spectroscopy (FTIRS) it is possible to obtain, for the first time, spectroscopic evidence for ANI dimers produced by head-to-tail (4-aminodiphenylamine, 4ADA) and tail-to-tail (benzidine, BZ) coupling of ANI cation radicals. The 4ADA dimer is adsorbed on the electrode surface during polymerization, as proved by cyclic voltammetry of thin PANI films and its infrared spectrum. This method also allows, with the help of computational simulations, to assign characteristic vibration frequencies for the different oxidation states of PANI. The presence of 4ADA retained inside thin polymer layers is established too. On the other hand, FTIRS demonstrates that the electrochemically promoted degradation of PANI renders p-benzoquinone as its main product. This compound, retained inside the film, is apparent in the cyclic voltammogram in the same potential region previously observed for 4ADA dimer. Therefore, applying in situ FTIRS is possible to distinguish between different chemical species (4ADA or p-benzoquinone) which give rise to voltammetric peaks in the same potential region. Indophenol and CO2 are also detected by FTIRS during ANI oxidation and polymer degradation. The formation of CO2 during degradation is confirmed by differential electrochemical mass spectroscopy. To the best of our knowledge, this is the first evidence of the oxidation of a conducting polymer to CO2 by electrochemical means. The relevance of the production of different intermediate species towards PANI fabrication and applications is discussed. © the Owner Societies.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Royal Society of Chemistry  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
FTIR  
dc.subject
POLYANILINE  
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DEGRADATION  
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ELECTROPOLYMERIZATION  
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica  
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Ciencias Químicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Spectroscopic evidence for intermediate species formed during aniline polymerization and polyaniline degradation  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2023-05-04T17:48:57Z  
dc.identifier.eissn
0005-9021  
dc.journal.volume
12  
dc.journal.number
35  
dc.journal.pagination
10584-10593  
dc.journal.pais
Reino Unido  
dc.journal.ciudad
Cambridge  
dc.description.fil
Fil: Planes, Gabriel Angel. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; Argentina  
dc.description.fil
Fil: Rodríguez, J. L.. Universidad de La Laguna; España  
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Fil: Miras, Maria Cristina. Universidad Nacional de Río Cuarto; Argentina  
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Fil: García, G.. Universidad de La Laguna; España  
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Fil: Pastor, E.. Universidad de La Laguna; España  
dc.description.fil
Fil: Barbero, César Alfredo. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; Argentina  
dc.journal.title
Physical Chemistry Chemical Physics  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1039/C002920C  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.rsc.org/en/content/articlelanding/2010/CP/c002920c