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

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 th...

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Detalles Bibliográficos
Autores principales: Lezna, Reynaldo Oscar, Tacconi, Norma R. de, Hahn, F., Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1991
Materias:
Ciencias Exactas
Química
Spectroelectrochemistry
Methylene
Sulphur-modified gold electrode
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/121358
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-121358
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Química
Spectroelectrochemistry
Methylene
Sulphur-modified gold electrode
spellingShingle Ciencias Exactas
Química
Spectroelectrochemistry
Methylene
Sulphur-modified gold electrode
Lezna, Reynaldo Oscar
Tacconi, Norma R. de
Hahn, F.
Arvia, Alejandro Jorge
In-situ spectroelectrochemistry of adsorbed methylene blue on a sulphur-modified gold electrode
topic_facet Ciencias Exactas
Química
Spectroelectrochemistry
Methylene
Sulphur-modified gold electrode
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.
format Articulo
Articulo
author Lezna, Reynaldo Oscar
Tacconi, Norma R. de
Hahn, F.
Arvia, Alejandro Jorge
author_facet Lezna, Reynaldo Oscar
Tacconi, Norma R. de
Hahn, F.
Arvia, Alejandro Jorge
author_sort Lezna, Reynaldo Oscar
title In-situ spectroelectrochemistry of adsorbed methylene blue on a 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
publishDate 1991
url http://sedici.unlp.edu.ar/handle/10915/121358
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AT hahnf insituspectroelectrochemistryofadsorbedmethyleneblueonasulphurmodifiedgoldelectrode
AT arviaalejandrojorge insituspectroelectrochemistryofadsorbedmethyleneblueonasulphurmodifiedgoldelectrode
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