Preparation and characterization of self assembled monolayers of 2-mercaptonicotinic acid on Au(1 1 1)
- Autores
- Pissinis, Diego Ezequiel; Linarez Pérez, Omar Ezequiel; Cometto, Fernando Pablo; Lopez Teijelo, Manuel
- Año de publicación
- 2014
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The characterization by cyclic voltammetry, impedance spectroscopy and SERS measurements of 2-mer-captonicotinic acid (2-MNA) monolayers formed under different conditions on Au(111) surfaces, isreported.Self-assembled 2-MNA monolayers on Au(111) in alkaline solutions desorbs reductively from the goldsurface at 0.76 V (vs. ECS). From desorption experiments, the value of the surface concentration wasestimated, resulting similar to that reported for related aromatic molecules.Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) show a rather imperfectblocking behavior of the 2-MNA SAMS. This behavior corresponds to that obtained for microelectrodearrays, which is attributed to the access of ions through pinholes, defects and/or pores present in theSAM.The characteristics of ionisable groups exposed to the solution in the 2-MNA monolayers prepared bydipping in alkaline solutions were obtained by impedance measurements at different pH using the[Fe(CN)6]3 /[Fe(CN)6]4 redox probe and the value of pKa(SAM)for the carboxylate group in the surface2-MNA monolayer was estimated. For pH > pKa, the carboxylic acid group is deprotonated and the mono-layer acquires a negative surface charge, meanwhile it remains neutral or positively charged at lower pHvalues due to the beginning of pyridinic nitrogen protonation, which takes place overlapped with the pro-tonation of the carboxylate group. The protonation of the pyridinic nitrogen is accompanied by desorp-tion of this group from the surface. This leads to a change in the orientation of 2-MNA species allowingthe interaction between the carboxylate group and the gold surface, which was further corroborated fromSERS measurements.In alkaline aqueous medium, 2-MNA adsorbs through a thiolate chemical bond on the gold surface andan additional interaction of the pyridinic nitrogen stabilizes the monolayer. One cathodic peak isobtained when reductive desorption is made in alkaline medium, while a splitting in two cathodic cur-rent contributions for pH values lower than ca. 7 indicates that two different molecular structures coexiston the gold surface in neutral or acidic media. This is assigned to the occurrence of an equilibriumbetween the molecular structure bonded through sulfur and nitrogen and the surface-bonded zwitter-ionic species by intramolecular proton transfer from the carboxylic acid group to the ring nitrogen, lead-ing to the protonation of the pyridinic nitrogen and allowing the interaction of the carboxylate groupwith the gold surface.
Fil: Pissinis, Diego Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Linarez Pérez, Omar Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Cometto, Fernando Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Lopez Teijelo, Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina - Materia
-
Self Assembled Monolayers
Aromatic Thiols
Reductive Desorption
Sers - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/31538
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Preparation and characterization of self assembled monolayers of 2-mercaptonicotinic acid on Au(1 1 1)Pissinis, Diego EzequielLinarez Pérez, Omar EzequielCometto, Fernando PabloLopez Teijelo, ManuelSelf Assembled MonolayersAromatic ThiolsReductive DesorptionSershttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The characterization by cyclic voltammetry, impedance spectroscopy and SERS measurements of 2-mer-captonicotinic acid (2-MNA) monolayers formed under different conditions on Au(111) surfaces, isreported.Self-assembled 2-MNA monolayers on Au(111) in alkaline solutions desorbs reductively from the goldsurface at 0.76 V (vs. ECS). From desorption experiments, the value of the surface concentration wasestimated, resulting similar to that reported for related aromatic molecules.Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) show a rather imperfectblocking behavior of the 2-MNA SAMS. This behavior corresponds to that obtained for microelectrodearrays, which is attributed to the access of ions through pinholes, defects and/or pores present in theSAM.The characteristics of ionisable groups exposed to the solution in the 2-MNA monolayers prepared bydipping in alkaline solutions were obtained by impedance measurements at different pH using the[Fe(CN)6]3 /[Fe(CN)6]4 redox probe and the value of pKa(SAM)for the carboxylate group in the surface2-MNA monolayer was estimated. For pH > pKa, the carboxylic acid group is deprotonated and the mono-layer acquires a negative surface charge, meanwhile it remains neutral or positively charged at lower pHvalues due to the beginning of pyridinic nitrogen protonation, which takes place overlapped with the pro-tonation of the carboxylate group. The protonation of the pyridinic nitrogen is accompanied by desorp-tion of this group from the surface. This leads to a change in the orientation of 2-MNA species allowingthe interaction between the carboxylate group and the gold surface, which was further corroborated fromSERS measurements.In alkaline aqueous medium, 2-MNA adsorbs through a thiolate chemical bond on the gold surface andan additional interaction of the pyridinic nitrogen stabilizes the monolayer. One cathodic peak isobtained when reductive desorption is made in alkaline medium, while a splitting in two cathodic cur-rent contributions for pH values lower than ca. 7 indicates that two different molecular structures coexiston the gold surface in neutral or acidic media. This is assigned to the occurrence of an equilibriumbetween the molecular structure bonded through sulfur and nitrogen and the surface-bonded zwitter-ionic species by intramolecular proton transfer from the carboxylic acid group to the ring nitrogen, lead-ing to the protonation of the pyridinic nitrogen and allowing the interaction of the carboxylate groupwith the gold surface.Fil: Pissinis, Diego Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Linarez Pérez, Omar Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Cometto, Fernando Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Lopez Teijelo, Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaElsevier Science Sa2014-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/31538Lopez Teijelo, Manuel; Cometto, Fernando Pablo; Linarez Pérez, Omar Ezequiel; Pissinis, Diego Ezequiel; Preparation and characterization of self assembled monolayers of 2-mercaptonicotinic acid on Au(1 1 1); Elsevier Science Sa; Journal of Electroanalytical Chemistry; 712; 1-2014; 167-1771572-6657CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.jelechem.2013.11.013info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S1572665713005109info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:36:04Zoai:ri.conicet.gov.ar:11336/31538instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:36:04.322CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Preparation and characterization of self assembled monolayers of 2-mercaptonicotinic acid on Au(1 1 1) |
title |
Preparation and characterization of self assembled monolayers of 2-mercaptonicotinic acid on Au(1 1 1) |
spellingShingle |
Preparation and characterization of self assembled monolayers of 2-mercaptonicotinic acid on Au(1 1 1) Pissinis, Diego Ezequiel Self Assembled Monolayers Aromatic Thiols Reductive Desorption Sers |
title_short |
Preparation and characterization of self assembled monolayers of 2-mercaptonicotinic acid on Au(1 1 1) |
title_full |
Preparation and characterization of self assembled monolayers of 2-mercaptonicotinic acid on Au(1 1 1) |
title_fullStr |
Preparation and characterization of self assembled monolayers of 2-mercaptonicotinic acid on Au(1 1 1) |
title_full_unstemmed |
Preparation and characterization of self assembled monolayers of 2-mercaptonicotinic acid on Au(1 1 1) |
title_sort |
Preparation and characterization of self assembled monolayers of 2-mercaptonicotinic acid on Au(1 1 1) |
dc.creator.none.fl_str_mv |
Pissinis, Diego Ezequiel Linarez Pérez, Omar Ezequiel Cometto, Fernando Pablo Lopez Teijelo, Manuel |
author |
Pissinis, Diego Ezequiel |
author_facet |
Pissinis, Diego Ezequiel Linarez Pérez, Omar Ezequiel Cometto, Fernando Pablo Lopez Teijelo, Manuel |
author_role |
author |
author2 |
Linarez Pérez, Omar Ezequiel Cometto, Fernando Pablo Lopez Teijelo, Manuel |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
Self Assembled Monolayers Aromatic Thiols Reductive Desorption Sers |
topic |
Self Assembled Monolayers Aromatic Thiols Reductive Desorption Sers |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
The characterization by cyclic voltammetry, impedance spectroscopy and SERS measurements of 2-mer-captonicotinic acid (2-MNA) monolayers formed under different conditions on Au(111) surfaces, isreported.Self-assembled 2-MNA monolayers on Au(111) in alkaline solutions desorbs reductively from the goldsurface at 0.76 V (vs. ECS). From desorption experiments, the value of the surface concentration wasestimated, resulting similar to that reported for related aromatic molecules.Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) show a rather imperfectblocking behavior of the 2-MNA SAMS. This behavior corresponds to that obtained for microelectrodearrays, which is attributed to the access of ions through pinholes, defects and/or pores present in theSAM.The characteristics of ionisable groups exposed to the solution in the 2-MNA monolayers prepared bydipping in alkaline solutions were obtained by impedance measurements at different pH using the[Fe(CN)6]3 /[Fe(CN)6]4 redox probe and the value of pKa(SAM)for the carboxylate group in the surface2-MNA monolayer was estimated. For pH > pKa, the carboxylic acid group is deprotonated and the mono-layer acquires a negative surface charge, meanwhile it remains neutral or positively charged at lower pHvalues due to the beginning of pyridinic nitrogen protonation, which takes place overlapped with the pro-tonation of the carboxylate group. The protonation of the pyridinic nitrogen is accompanied by desorp-tion of this group from the surface. This leads to a change in the orientation of 2-MNA species allowingthe interaction between the carboxylate group and the gold surface, which was further corroborated fromSERS measurements.In alkaline aqueous medium, 2-MNA adsorbs through a thiolate chemical bond on the gold surface andan additional interaction of the pyridinic nitrogen stabilizes the monolayer. One cathodic peak isobtained when reductive desorption is made in alkaline medium, while a splitting in two cathodic cur-rent contributions for pH values lower than ca. 7 indicates that two different molecular structures coexiston the gold surface in neutral or acidic media. This is assigned to the occurrence of an equilibriumbetween the molecular structure bonded through sulfur and nitrogen and the surface-bonded zwitter-ionic species by intramolecular proton transfer from the carboxylic acid group to the ring nitrogen, lead-ing to the protonation of the pyridinic nitrogen and allowing the interaction of the carboxylate groupwith the gold surface. Fil: Pissinis, Diego Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Linarez Pérez, Omar Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Cometto, Fernando Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Lopez Teijelo, Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina |
description |
The characterization by cyclic voltammetry, impedance spectroscopy and SERS measurements of 2-mer-captonicotinic acid (2-MNA) monolayers formed under different conditions on Au(111) surfaces, isreported.Self-assembled 2-MNA monolayers on Au(111) in alkaline solutions desorbs reductively from the goldsurface at 0.76 V (vs. ECS). From desorption experiments, the value of the surface concentration wasestimated, resulting similar to that reported for related aromatic molecules.Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) show a rather imperfectblocking behavior of the 2-MNA SAMS. This behavior corresponds to that obtained for microelectrodearrays, which is attributed to the access of ions through pinholes, defects and/or pores present in theSAM.The characteristics of ionisable groups exposed to the solution in the 2-MNA monolayers prepared bydipping in alkaline solutions were obtained by impedance measurements at different pH using the[Fe(CN)6]3 /[Fe(CN)6]4 redox probe and the value of pKa(SAM)for the carboxylate group in the surface2-MNA monolayer was estimated. For pH > pKa, the carboxylic acid group is deprotonated and the mono-layer acquires a negative surface charge, meanwhile it remains neutral or positively charged at lower pHvalues due to the beginning of pyridinic nitrogen protonation, which takes place overlapped with the pro-tonation of the carboxylate group. The protonation of the pyridinic nitrogen is accompanied by desorp-tion of this group from the surface. This leads to a change in the orientation of 2-MNA species allowingthe interaction between the carboxylate group and the gold surface, which was further corroborated fromSERS measurements.In alkaline aqueous medium, 2-MNA adsorbs through a thiolate chemical bond on the gold surface andan additional interaction of the pyridinic nitrogen stabilizes the monolayer. One cathodic peak isobtained when reductive desorption is made in alkaline medium, while a splitting in two cathodic cur-rent contributions for pH values lower than ca. 7 indicates that two different molecular structures coexiston the gold surface in neutral or acidic media. This is assigned to the occurrence of an equilibriumbetween the molecular structure bonded through sulfur and nitrogen and the surface-bonded zwitter-ionic species by intramolecular proton transfer from the carboxylic acid group to the ring nitrogen, lead-ing to the protonation of the pyridinic nitrogen and allowing the interaction of the carboxylate groupwith the gold surface. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-01 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 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://hdl.handle.net/11336/31538 Lopez Teijelo, Manuel; Cometto, Fernando Pablo; Linarez Pérez, Omar Ezequiel; Pissinis, Diego Ezequiel; Preparation and characterization of self assembled monolayers of 2-mercaptonicotinic acid on Au(1 1 1); Elsevier Science Sa; Journal of Electroanalytical Chemistry; 712; 1-2014; 167-177 1572-6657 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/31538 |
identifier_str_mv |
Lopez Teijelo, Manuel; Cometto, Fernando Pablo; Linarez Pérez, Omar Ezequiel; Pissinis, Diego Ezequiel; Preparation and characterization of self assembled monolayers of 2-mercaptonicotinic acid on Au(1 1 1); Elsevier Science Sa; Journal of Electroanalytical Chemistry; 712; 1-2014; 167-177 1572-6657 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jelechem.2013.11.013 info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S1572665713005109 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier Science Sa |
publisher.none.fl_str_mv |
Elsevier Science Sa |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1844613128290041856 |
score |
13.070432 |