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Menéndez, G.O.; Cortés, E.; Grumelli, D.; Méndez De Leo, L.P.; Williams, F.J.; Tognalli, N.G.; Fainstein, A.; Vela, M.E.; Jares-Erijman, E.A.; Salvarezza, R.C. "Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces" (2012) Nanoscale. 4(2):531-540
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Abstract:

Heptamethinecyanine J-aggregates display sharp, intense fluorescence emission making them attractive candidates for developing a variety of chem-bio-sensing applications. They have been immobilized on planar thiol-covered Au surfaces and thiol-capped Au nanoparticles by weak molecular interactions. In this work the self-assembly of novel thiolated cyanine (CNN) on Au(111) and citrate-capped AuNPs from solutions containing monomers and J-aggregates has been studied by using STM, XPS, PM-IRRAS, electrochemical techniques and Raman spectroscopy. Data show that CNN species adsorb on the Au surfaces by forming thiolate-Au bonds. We found that the J-aggregates are preferentially adsorbed on the Au(111) surface directly from the solution while adsorbed CNN monomers cannot organize into aggregates on the substrate surface. These results indicate that the CNN-Au interaction is not able to disorganize the large J-aggregates stabilized by π-π stacking to optimize the S-Au binding site but it is strong enough to hinder the π-π stacking when CNNs are chemisorbed as monomers. The optical properties of the J-aggregates remain active after adsorption. The possibility of covalently bonding CNN J-aggregates to Au planar surfaces and Au nanoparticles controlling the J-aggregate/Au distance opens a new path regarding their improved stability and the wide range of biological applications of both CNN and AuNP biocompatible systems. © 2012 The Royal Society of Chemistry.

Registro:

Documento: Artículo
Título:Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces
Autor:Menéndez, G.O.; Cortés, E.; Grumelli, D.; Méndez De Leo, L.P.; Williams, F.J.; Tognalli, N.G.; Fainstein, A.; Vela, M.E.; Jares-Erijman, E.A.; Salvarezza, R.C.
Filiación:CHIDECAR, Departamento de Química Orgánica, Ciudad Universitaria Pabellón II, Buenos Aires 1428, Argentina
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de la Plata-CONICET, Sucursal 4 Casilla de Correo 16, La Plata 1900, Buenos Aires, Argentina
INQUIMAE, CONICET, Departamento de Química Inorgánica, Ciudad Universitaria Pabellón II, Buenos Aires 1428, Argentina
Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, Universidad Nacional de Cuyo, San Carlos de Bariloche 8400 Río Negro, Argentina
Palabras clave:Au nanoparticle; Au surfaces; Au(1 1 1 ); Au(111) surfaces; Bio-compatible systems; Biological applications; Electrochemical techniques; Fluorescence emission; J aggregates; Planar surface; PM-IRRAS; Substrate surface; Adsorption; Aggregates; Chemisorption; Monomers; Nanoparticles; Optical properties; Raman spectroscopy; Self assembly; Gold; cyanide; gold; nanomaterial; thiol derivative; article; chemistry; conformation; macromolecule; materials testing; particle size; surface property; ultrastructure; Cyanides; Gold; Macromolecular Substances; Materials Testing; Molecular Conformation; Nanostructures; Particle Size; Sulfhydryl Compounds; Surface Properties
Año:2012
Volumen:4
Número:2
Página de inicio:531
Página de fin:540
DOI: http://dx.doi.org/10.1039/c1nr11039j
Título revista:Nanoscale
Título revista abreviado:Nanoscale
ISSN:20403364
CAS:cyanide, 57-12-5; gold, 7440-57-5; thiol derivative, 13940-21-1; Cyanides; Gold, 7440-57-5; Macromolecular Substances; Sulfhydryl Compounds
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20403364_v4_n2_p531_Menendez

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Citas:

---------- APA ----------
Menéndez, G.O., Cortés, E., Grumelli, D., Méndez De Leo, L.P., Williams, F.J., Tognalli, N.G., Fainstein, A.,..., Salvarezza, R.C. (2012) . Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces. Nanoscale, 4(2), 531-540.
http://dx.doi.org/10.1039/c1nr11039j
---------- CHICAGO ----------
Menéndez, G.O., Cortés, E., Grumelli, D., Méndez De Leo, L.P., Williams, F.J., Tognalli, N.G., et al. "Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces" . Nanoscale 4, no. 2 (2012) : 531-540.
http://dx.doi.org/10.1039/c1nr11039j
---------- MLA ----------
Menéndez, G.O., Cortés, E., Grumelli, D., Méndez De Leo, L.P., Williams, F.J., Tognalli, N.G., et al. "Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces" . Nanoscale, vol. 4, no. 2, 2012, pp. 531-540.
http://dx.doi.org/10.1039/c1nr11039j
---------- VANCOUVER ----------
Menéndez, G.O., Cortés, E., Grumelli, D., Méndez De Leo, L.P., Williams, F.J., Tognalli, N.G., et al. Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces. Nanoscale. 2012;4(2):531-540.
http://dx.doi.org/10.1039/c1nr11039j