6-Mercaptopurine Self-Assembled Monolayers on Gold (001)-Hex: Revealing the Fate of Gold Adatoms

Thiol molecules adsorbed on gold became a model system for molecular self-assembly on metal substrates long ago. In most cases the strong molecule-gold interaction is able to restructure the substrate, resulting in vacancy islands and steps. Today it is widely accepted that gold adatoms produced by...

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Autores principales: Carro, Pilar, Müller, Kathrin, Lobo Maza, Flavia Emilia, Vericat, Carolina, Starke, Ulrich, Kern, Klaus, Salvarezza, Roberto Carlos, Grumelli, Doris Elda
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2017
Materias:
Química
Self assembled monolayers
6 mercaptopurine
Au 100 5x20
Stm_leed
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/98478
https://ri.conicet.gov.ar/11336/63302
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-98478
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Self assembled monolayers
6 mercaptopurine
Au 100 5x20
Stm_leed
spellingShingle Química
Self assembled monolayers
6 mercaptopurine
Au 100 5x20
Stm_leed
Carro, Pilar
Müller, Kathrin
Lobo Maza, Flavia Emilia
Vericat, Carolina
Starke, Ulrich
Kern, Klaus
Salvarezza, Roberto Carlos
Grumelli, Doris Elda
6-Mercaptopurine Self-Assembled Monolayers on Gold (001)-Hex: Revealing the Fate of Gold Adatoms
topic_facet Química
Self assembled monolayers
6 mercaptopurine
Au 100 5x20
Stm_leed
description Thiol molecules adsorbed on gold became a model system for molecular self-assembly on metal substrates long ago. In most cases the strong molecule-gold interaction is able to restructure the substrate, resulting in vacancy islands and steps. Today it is widely accepted that gold adatoms produced by this process form stable thiol-adatom complexes, usually termed "staples" (RS-Auad-SR or RS-Auad-SR-Auad-SR), which are the basic units of the self-assembled monolayers. Here we report on a different scenario for 6-mercaptopurine (6MP), a heterocyclic aromatic thiol, namely its adsorption on the Au(001)-(5 × 20) reconstructed surface. Our results show that 6MP lifts the reconstruction upon adsorption, thus ejecting a large excess of gold adatoms. Surprisingly, 6MP molecules prefer to arrange in highly ordered adatom-free domains in the bridging configuration, while the ejected adatoms form gold islands. Our investigation reveals that the formation of thiol-gold adatom complexes is not always a thermodynamically favored process but rather depends on the nature of the thiol molecule.
format Articulo
Preprint
author Carro, Pilar
Müller, Kathrin
Lobo Maza, Flavia Emilia
Vericat, Carolina
Starke, Ulrich
Kern, Klaus
Salvarezza, Roberto Carlos
Grumelli, Doris Elda
author_facet Carro, Pilar
Müller, Kathrin
Lobo Maza, Flavia Emilia
Vericat, Carolina
Starke, Ulrich
Kern, Klaus
Salvarezza, Roberto Carlos
Grumelli, Doris Elda
author_sort Carro, Pilar
title 6-Mercaptopurine Self-Assembled Monolayers on Gold (001)-Hex: Revealing the Fate of Gold Adatoms
title_short 6-Mercaptopurine Self-Assembled Monolayers on Gold (001)-Hex: Revealing the Fate of Gold Adatoms
title_full 6-Mercaptopurine Self-Assembled Monolayers on Gold (001)-Hex: Revealing the Fate of Gold Adatoms
title_fullStr 6-Mercaptopurine Self-Assembled Monolayers on Gold (001)-Hex: Revealing the Fate of Gold Adatoms
title_full_unstemmed 6-Mercaptopurine Self-Assembled Monolayers on Gold (001)-Hex: Revealing the Fate of Gold Adatoms
title_sort 6-mercaptopurine self-assembled monolayers on gold (001)-hex: revealing the fate of gold adatoms
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/98478
https://ri.conicet.gov.ar/11336/63302
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