In situ FTIRRAS study of the electro-oxidation reactions of thiourea and gold in aqueous acid solutions
- Autores
- Bolzán, Agustín Eduardo; Iwasita, T.; Arvia, Alejandro Jorge
- Año de publicación
- 2003
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The electro-oxidation of gold and thiourea (TU) in aqueous acid solutions is investigated by means of in situ FTIRRAS measurements complemented by voltammetry. The formation of soluble species related to the gold(I)-TU complex and TU electrooxidation products is monitored by following the changes in the IR spectra with the applied potential in the range -0.1 -1.5 V. Experimental data show that gold electrodissolution produces soluble [Au(CS(NH2)2)2]2SO4 species. The IR spectrum of solid samples of this complex is reported. The electrodissolution reaction begins at approximately 0.15 V (SHE), concomitantly with the early stages of TU electro-oxidation. The electro-oxidation of TU on gold in acid solutions produces formamidine disulphide (FDS) at potentials below 1.2 V (SHE). The formation of the gold complex and that of FDS are quasi-reversible processes, as revealed by FTIRRAS data. Once the formation of the oxygen-containing layer on gold sets in, the electro-oxidation of TU and FDS yields carbon dioxide, sulphate ions and CN-containing products. Adsorbed sulphate species, which are also detected from 1.2 V upwards, exhibit a band shift of 27 cm-1 V-1.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas - Materia
-
Ciencias Exactas
Química
Thiourea
Electro-oxidation
Formamidine disulphide
FTIRRAS
Gold
Electrodissolution - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/121267
Ver los metadatos del registro completo
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In situ FTIRRAS study of the electro-oxidation reactions of thiourea and gold in aqueous acid solutionsBolzán, Agustín EduardoIwasita, T.Arvia, Alejandro JorgeCiencias ExactasQuímicaThioureaElectro-oxidationFormamidine disulphideFTIRRASGoldElectrodissolutionThe electro-oxidation of gold and thiourea (TU) in aqueous acid solutions is investigated by means of in situ FTIRRAS measurements complemented by voltammetry. The formation of soluble species related to the gold(I)-TU complex and TU electrooxidation products is monitored by following the changes in the IR spectra with the applied potential in the range -0.1 -1.5 V. Experimental data show that gold electrodissolution produces soluble [Au(CS(NH<sub>2</sub>)<sub>2</sub>)<sub>2</sub>]<sub>2</sub>SO<sub>4</sub> species. The IR spectrum of solid samples of this complex is reported. The electrodissolution reaction begins at approximately 0.15 V (SHE), concomitantly with the early stages of TU electro-oxidation. The electro-oxidation of TU on gold in acid solutions produces formamidine disulphide (FDS) at potentials below 1.2 V (SHE). The formation of the gold complex and that of FDS are quasi-reversible processes, as revealed by FTIRRAS data. Once the formation of the oxygen-containing layer on gold sets in, the electro-oxidation of TU and FDS yields carbon dioxide, sulphate ions and CN-containing products. Adsorbed sulphate species, which are also detected from 1.2 V upwards, exhibit a band shift of 27 cm<sup>-1</sup> V<sup>-1</sup>.Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas2003info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf49-60http://sedici.unlp.edu.ar/handle/10915/121267enginfo:eu-repo/semantics/altIdentifier/issn/0022-0728info:eu-repo/semantics/altIdentifier/doi/10.1016/S0022-0728(03)00050-0info: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:UNLP2025-09-29T11:28:45Zoai:sedici.unlp.edu.ar:10915/121267Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:28:45.537SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
In situ FTIRRAS study of the electro-oxidation reactions of thiourea and gold in aqueous acid solutions |
title |
In situ FTIRRAS study of the electro-oxidation reactions of thiourea and gold in aqueous acid solutions |
spellingShingle |
In situ FTIRRAS study of the electro-oxidation reactions of thiourea and gold in aqueous acid solutions Bolzán, Agustín Eduardo Ciencias Exactas Química Thiourea Electro-oxidation Formamidine disulphide FTIRRAS Gold Electrodissolution |
title_short |
In situ FTIRRAS study of the electro-oxidation reactions of thiourea and gold in aqueous acid solutions |
title_full |
In situ FTIRRAS study of the electro-oxidation reactions of thiourea and gold in aqueous acid solutions |
title_fullStr |
In situ FTIRRAS study of the electro-oxidation reactions of thiourea and gold in aqueous acid solutions |
title_full_unstemmed |
In situ FTIRRAS study of the electro-oxidation reactions of thiourea and gold in aqueous acid solutions |
title_sort |
In situ FTIRRAS study of the electro-oxidation reactions of thiourea and gold in aqueous acid solutions |
dc.creator.none.fl_str_mv |
Bolzán, Agustín Eduardo Iwasita, T. Arvia, Alejandro Jorge |
author |
Bolzán, Agustín Eduardo |
author_facet |
Bolzán, Agustín Eduardo Iwasita, T. Arvia, Alejandro Jorge |
author_role |
author |
author2 |
Iwasita, T. Arvia, Alejandro Jorge |
author2_role |
author author |
dc.subject.none.fl_str_mv |
Ciencias Exactas Química Thiourea Electro-oxidation Formamidine disulphide FTIRRAS Gold Electrodissolution |
topic |
Ciencias Exactas Química Thiourea Electro-oxidation Formamidine disulphide FTIRRAS Gold Electrodissolution |
dc.description.none.fl_txt_mv |
The electro-oxidation of gold and thiourea (TU) in aqueous acid solutions is investigated by means of in situ FTIRRAS measurements complemented by voltammetry. The formation of soluble species related to the gold(I)-TU complex and TU electrooxidation products is monitored by following the changes in the IR spectra with the applied potential in the range -0.1 -1.5 V. Experimental data show that gold electrodissolution produces soluble [Au(CS(NH<sub>2</sub>)<sub>2</sub>)<sub>2</sub>]<sub>2</sub>SO<sub>4</sub> species. The IR spectrum of solid samples of this complex is reported. The electrodissolution reaction begins at approximately 0.15 V (SHE), concomitantly with the early stages of TU electro-oxidation. The electro-oxidation of TU on gold in acid solutions produces formamidine disulphide (FDS) at potentials below 1.2 V (SHE). The formation of the gold complex and that of FDS are quasi-reversible processes, as revealed by FTIRRAS data. Once the formation of the oxygen-containing layer on gold sets in, the electro-oxidation of TU and FDS yields carbon dioxide, sulphate ions and CN-containing products. Adsorbed sulphate species, which are also detected from 1.2 V upwards, exhibit a band shift of 27 cm<sup>-1</sup> V<sup>-1</sup>. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas |
description |
The electro-oxidation of gold and thiourea (TU) in aqueous acid solutions is investigated by means of in situ FTIRRAS measurements complemented by voltammetry. The formation of soluble species related to the gold(I)-TU complex and TU electrooxidation products is monitored by following the changes in the IR spectra with the applied potential in the range -0.1 -1.5 V. Experimental data show that gold electrodissolution produces soluble [Au(CS(NH<sub>2</sub>)<sub>2</sub>)<sub>2</sub>]<sub>2</sub>SO<sub>4</sub> species. The IR spectrum of solid samples of this complex is reported. The electrodissolution reaction begins at approximately 0.15 V (SHE), concomitantly with the early stages of TU electro-oxidation. The electro-oxidation of TU on gold in acid solutions produces formamidine disulphide (FDS) at potentials below 1.2 V (SHE). The formation of the gold complex and that of FDS are quasi-reversible processes, as revealed by FTIRRAS data. Once the formation of the oxygen-containing layer on gold sets in, the electro-oxidation of TU and FDS yields carbon dioxide, sulphate ions and CN-containing products. Adsorbed sulphate species, which are also detected from 1.2 V upwards, exhibit a band shift of 27 cm<sup>-1</sup> V<sup>-1</sup>. |
publishDate |
2003 |
dc.date.none.fl_str_mv |
2003 |
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/10915/121267 |
url |
http://sedici.unlp.edu.ar/handle/10915/121267 |
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/S0022-0728(03)00050-0 |
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) |
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application/pdf 49-60 |
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