Photophysics of polyaniline: Sequence-length distribution dependence of photoluminescence quenching as studied by fluorescence measurements and Monte Carlo simulations
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...
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todo:paper_00323861_v53_n13_p2619_Antonel2023-10-03T14:45:14Z Photophysics of polyaniline: Sequence-length distribution dependence of photoluminescence quenching as studied by fluorescence measurements and Monte Carlo simulations Antonel, P.S. Völker, E. Molina, F.V. 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 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. Fil:Antonel, P.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Völker, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Molina, F.V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00323861_v53_n13_p2619_Antonel |
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Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 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 |
| topic_facet |
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 |
| description |
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. |
| format |
JOUR |
| author |
Antonel, P.S. Völker, E. Molina, F.V. |
| author_facet |
Antonel, P.S. Völker, E. Molina, F.V. |
| author_sort |
Antonel, P.S. |
| title |
Photophysics of polyaniline: Sequence-length distribution dependence of photoluminescence quenching as studied by fluorescence measurements and Monte Carlo simulations |
| title_short |
Photophysics of polyaniline: Sequence-length distribution dependence of photoluminescence quenching as studied by fluorescence measurements and Monte Carlo simulations |
| title_full |
Photophysics of polyaniline: Sequence-length distribution dependence of photoluminescence quenching as studied by fluorescence measurements and Monte Carlo simulations |
| title_fullStr |
Photophysics of polyaniline: Sequence-length distribution dependence of photoluminescence quenching as studied by fluorescence measurements and Monte Carlo simulations |
| title_full_unstemmed |
Photophysics of polyaniline: Sequence-length distribution dependence of photoluminescence quenching as studied by fluorescence measurements and Monte Carlo simulations |
| title_sort |
photophysics of polyaniline: sequence-length distribution dependence of photoluminescence quenching as studied by fluorescence measurements and monte carlo simulations |
| url |
http://hdl.handle.net/20.500.12110/paper_00323861_v53_n13_p2619_Antonel |
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