Artículo
6-Mercaptopurine Self-Assembled Monolayers on Gold (001)-Hex: Revealing the Fate of Gold Adatoms
Carro, Pilar; Müller, Kathrin; Lobo Maza, Flavia Emilia
; Vericat, Carolina
; Starke, Ulrich; Kern, Klaus; Salvarezza, Roberto Carlos
; Grumelli, Doris Elda
Fecha de publicación:
04/2017
Editorial:
American Chemical Society
Revista:
Journal of Physical Chemistry C
ISSN:
1932-7447
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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.
Palabras clave:
Self Assembled Monolayers
,
6 Mercaptopurine
,
Au 100 5x20
,
Stm_Leed
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Articulos(INIFTA)
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Citación
Carro, Pilar; Müller, Kathrin; Lobo Maza, Flavia Emilia; Vericat, Carolina; Starke, Ulrich; et al.; 6-Mercaptopurine Self-Assembled Monolayers on Gold (001)-Hex: Revealing the Fate of Gold Adatoms; American Chemical Society; Journal of Physical Chemistry C; 121; 16; 4-2017; 8938-8943
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