Abstract:
The dependence of the fluorescence quenching of electropolymerized poly(aniline-co-m-chloroaniline) with polymer composition has been investigated. Fluorescence emission in polyaniline is quenched when the polymer is oxidized (brought to emeraldine state); the copolymers exhibit decreasing quenching as chloroaniline contents increases. Quenching shows a strong decrease in the presence of 0.1% m-chloroaniline monomers in the feed. The presence of dichloroaniline units in the copolymer was confirmed by XPS measurements and a terpolymerization reaction scheme was developed, obtaining the kinetic parameters. By Monte Carlo simulation the sequence length distributions for different compositions were obtained and compared; it was found that quenching, for low aniline contents, requires aniline sequences of at least three units. The strong decrease in quenching at low m-chloroaniline contents is attributed to a double effect: breaking of conjugation in the emeraldine form by the presence of the chlorinated unit, and a disruption of the close chain packing in the crystalline domains, preventing state delocalization and thus efficient quenching. © 2012 Elsevier Ltd. All rights reserved.
Registro:
Documento: |
Artículo
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Título: | Photophysics of polyaniline: Sequence-length distribution dependence of photoluminescence quenching as studied by fluorescence measurements and Monte Carlo simulations |
Autor: | Antonel, P.S.; Völker, E.; Molina, F.V. |
Filiación: | Instituto de Química Física de Materiales Ambiente y Energía (INQUIMAE), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellon II, piso 1, C1428EHA Buenos Aires, Argentina
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Palabras clave: | Conducting polymers; Microstructure; Terpolymerization; Aniline; Conducting polymers; Fluorescence quenching; Intelligent systems; Isomers; Microstructure; Polyaniline; Terpolymerization; Crystalline domains; Fluorescence emission; Fluorescence measurements; Photoluminescence quenching; Polymer composition; Reaction schemes; Sequence length distributions; XPS measurements; Monte Carlo methods |
Año: | 2012
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Volumen: | 53
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Número: | 13
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Página de inicio: | 2619
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Página de fin: | 2627
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DOI: |
http://dx.doi.org/10.1016/j.polymer.2012.04.041 |
Título revista: | Polymer
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Título revista abreviado: | Polymer
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ISSN: | 00323861
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CODEN: | POLMA
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00323861_v53_n13_p2619_Antonel |
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Citas:
---------- APA ----------
Antonel, P.S., Völker, E. & Molina, F.V.
(2012)
. Photophysics of polyaniline: Sequence-length distribution dependence of photoluminescence quenching as studied by fluorescence measurements and Monte Carlo simulations. Polymer, 53(13), 2619-2627.
http://dx.doi.org/10.1016/j.polymer.2012.04.041---------- CHICAGO ----------
Antonel, P.S., Völker, E., Molina, F.V.
"Photophysics of polyaniline: Sequence-length distribution dependence of photoluminescence quenching as studied by fluorescence measurements and Monte Carlo simulations"
. Polymer 53, no. 13
(2012) : 2619-2627.
http://dx.doi.org/10.1016/j.polymer.2012.04.041---------- MLA ----------
Antonel, P.S., Völker, E., Molina, F.V.
"Photophysics of polyaniline: Sequence-length distribution dependence of photoluminescence quenching as studied by fluorescence measurements and Monte Carlo simulations"
. Polymer, vol. 53, no. 13, 2012, pp. 2619-2627.
http://dx.doi.org/10.1016/j.polymer.2012.04.041---------- VANCOUVER ----------
Antonel, P.S., Völker, E., Molina, F.V. Photophysics of polyaniline: Sequence-length distribution dependence of photoluminescence quenching as studied by fluorescence measurements and Monte Carlo simulations. Polymer. 2012;53(13):2619-2627.
http://dx.doi.org/10.1016/j.polymer.2012.04.041