In-situ spectroelectrochemistry of adsorbed methylene blue on a sulphur-modified gold electrode

Autores
Lezna, Reynaldo Oscar; Tacconi, Norma R. de; Hahn, F.; Arvia, Alejandro Jorge
Año de publicación
1991
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The properties of a methylene blue layer adsorbed onto a sulphur-modified gold electrode have been studied by electrochemical and in-situ reflectance spectroscopy in the visible region. At saturation coverage, methylene blue monomer and dimer bands were observed in the double-layer region through the electrochromism of the adsorbed film arising from the effect of the double-layer field on the molecule transition moment. Possible dye orientations in the adsorbed state are discussed with the aid of the optical measurements. At low surface concentrations, the optical signal stems from modulation of the monomer/dimer interconversion. Repeated electrochemical reduction and oxidation of adsorbed methylene blue result in gradual desorption of the dimer species, probably due to a change in the molecular geometry upon reduction which may evolve from a planar configuration to a folded structure.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
Materia
Ciencias Exactas
Química
Spectroelectrochemistry
Methylene
Sulphur-modified gold electrode
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/121358
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/121358
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling In-situ spectroelectrochemistry of adsorbed methylene blue on a sulphur-modified gold electrodeLezna, Reynaldo OscarTacconi, Norma R. deHahn, F.Arvia, Alejandro JorgeCiencias ExactasQuímicaSpectroelectrochemistryMethyleneSulphur-modified gold electrodeThe properties of a methylene blue layer adsorbed onto a sulphur-modified gold electrode have been studied by electrochemical and in-situ reflectance spectroscopy in the visible region. At saturation coverage, methylene blue monomer and dimer bands were observed in the double-layer region through the electrochromism of the adsorbed film arising from the effect of the double-layer field on the molecule transition moment. Possible dye orientations in the adsorbed state are discussed with the aid of the optical measurements. At low surface concentrations, the optical signal stems from modulation of the monomer/dimer interconversion. Repeated electrochemical reduction and oxidation of adsorbed methylene blue result in gradual desorption of the dimer species, probably due to a change in the molecular geometry upon reduction which may evolve from a planar configuration to a folded structure.Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas1991info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf259-269http://sedici.unlp.edu.ar/handle/10915/121358enginfo:eu-repo/semantics/altIdentifier/issn/0022-0728info:eu-repo/semantics/altIdentifier/doi/10.1016/0022-0728(91)85235-Hinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-29T15:33:52Zoai:sedici.unlp.edu.ar:10915/121358Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-29 15:33:52.525SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv In-situ spectroelectrochemistry of adsorbed methylene blue on a sulphur-modified gold electrode
title In-situ spectroelectrochemistry of adsorbed methylene blue on a sulphur-modified gold electrode
spellingShingle In-situ spectroelectrochemistry of adsorbed methylene blue on a sulphur-modified gold electrode
Lezna, Reynaldo Oscar
Ciencias Exactas
Química
Spectroelectrochemistry
Methylene
Sulphur-modified gold electrode
title_short In-situ spectroelectrochemistry of adsorbed methylene blue on a sulphur-modified gold electrode
title_full In-situ spectroelectrochemistry of adsorbed methylene blue on a sulphur-modified gold electrode
title_fullStr In-situ spectroelectrochemistry of adsorbed methylene blue on a sulphur-modified gold electrode
title_full_unstemmed In-situ spectroelectrochemistry of adsorbed methylene blue on a sulphur-modified gold electrode
title_sort In-situ spectroelectrochemistry of adsorbed methylene blue on a sulphur-modified gold electrode
dc.creator.none.fl_str_mv Lezna, Reynaldo Oscar
Tacconi, Norma R. de
Hahn, F.
Arvia, Alejandro Jorge
author Lezna, Reynaldo Oscar
author_facet Lezna, Reynaldo Oscar
Tacconi, Norma R. de
Hahn, F.
Arvia, Alejandro Jorge
author_role author
author2 Tacconi, Norma R. de
Hahn, F.
Arvia, Alejandro Jorge
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias Exactas
Química
Spectroelectrochemistry
Methylene
Sulphur-modified gold electrode
topic Ciencias Exactas
Química
Spectroelectrochemistry
Methylene
Sulphur-modified gold electrode
dc.description.none.fl_txt_mv The properties of a methylene blue layer adsorbed onto a sulphur-modified gold electrode have been studied by electrochemical and in-situ reflectance spectroscopy in the visible region. At saturation coverage, methylene blue monomer and dimer bands were observed in the double-layer region through the electrochromism of the adsorbed film arising from the effect of the double-layer field on the molecule transition moment. Possible dye orientations in the adsorbed state are discussed with the aid of the optical measurements. At low surface concentrations, the optical signal stems from modulation of the monomer/dimer interconversion. Repeated electrochemical reduction and oxidation of adsorbed methylene blue result in gradual desorption of the dimer species, probably due to a change in the molecular geometry upon reduction which may evolve from a planar configuration to a folded structure.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
description The properties of a methylene blue layer adsorbed onto a sulphur-modified gold electrode have been studied by electrochemical and in-situ reflectance spectroscopy in the visible region. At saturation coverage, methylene blue monomer and dimer bands were observed in the double-layer region through the electrochromism of the adsorbed film arising from the effect of the double-layer field on the molecule transition moment. Possible dye orientations in the adsorbed state are discussed with the aid of the optical measurements. At low surface concentrations, the optical signal stems from modulation of the monomer/dimer interconversion. Repeated electrochemical reduction and oxidation of adsorbed methylene blue result in gradual desorption of the dimer species, probably due to a change in the molecular geometry upon reduction which may evolve from a planar configuration to a folded structure.
publishDate 1991
dc.date.none.fl_str_mv 1991
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/121358
url http://sedici.unlp.edu.ar/handle/10915/121358
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0022-0728
info:eu-repo/semantics/altIdentifier/doi/10.1016/0022-0728(91)85235-H
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.format.none.fl_str_mv application/pdf
259-269
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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