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Abstract:

Metalloporphyrin molecules have a wide range of potential applications in diverse technological areas ranging from electronics to optoelectronics, electrochemistry, photophysics, chemical sensors, and catalysis. In particular, self-assembled monolayers of porphyrin molecules have recently attracted considerable interest. In this work we have studied for the first time the self-assembly of a novel Cu deutero porphyrin functionalized with disulfide moieties using electrochemical techniques, UV-vis absorption spectroscopy, polarization modulation infrared reflection absorption spectroscopy, and photoelectron spectroscopies (XPS and UPS). Experimental results indicate that the molecule adsorbs retaining its molecular integrity without forming molecular aggregates via the formation of Au-S covalent bonds. Furthermore, the monolayer consists of a packed array of molecules adsorbed with the plane of the porphyrin molecule at an angle of around 30° with respect to the surface normal. Interestingly, adsorption induces reduction of the Cu center and its consequent removal from the center of the porphyrin ring resulting in porphyrin demetalation. Our results are important in the design of self-assembled monolayers of metallo porphyrins where not only blocking of the metal center by the functional groups that drive the self-assembly should be considered but also possible adsorption induced demetalation with the consequent loss in the properties imparted by the metal center. © 2011 American Chemical Society.

Registro:

Documento: Artículo
Título:Self-assembled monolayers of disulfide Cu porphyrins on au surfaces: Adsorption induced reduction and demetalation
Autor:Verónica Rivas, M.; Méndez De Leo, L.P.; Hamer, M.; Carballo, R.; Williams, F.J.
Filiación:Departamento de Química Inorgánica, Analítica y Química Física, INQUIMAE-CONICET, Universidad de Buenos Aires, Buenos Aires, Argentina
Departamento de Química Analítica y Fisicoquímica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:Au surfaces; Demetalation; Electrochemical techniques; Functionalized; Metal centers; Metalloporphyrin molecules; Molecular aggregate; Packed arrays; Photophysics; Polarization modulation infrared reflection absorption spectroscopy; Porphyrin molecules; Porphyrin rings; Potential applications; Surface normals; UV-Vis absorption spectroscopy; Absorption; Absorption spectroscopy; Adsorption; Electrochemistry; Functional groups; Molecules; Photoelectron spectroscopy; Porphyrins; Reduction; Self assembly; Ultraviolet spectroscopy; Self assembled monolayers; copper; disulfide; gold; metalloporphyrin; adsorption; article; artificial membrane; chemical structure; chemistry; oxidation reduction reaction; surface property; Adsorption; Copper; Disulfides; Gold; Membranes, Artificial; Metalloporphyrins; Molecular Structure; Oxidation-Reduction; Surface Properties
Año:2011
Volumen:27
Número:17
Página de inicio:10714
Página de fin:10721
DOI: http://dx.doi.org/10.1021/la2020836
Título revista:Langmuir
Título revista abreviado:Langmuir
ISSN:07437463
CODEN:LANGD
CAS:copper, 15158-11-9, 7440-50-8; disulfide, 16734-12-6; gold, 7440-57-5; Copper, 7440-50-8; Disulfides; Gold, 7440-57-5; Membranes, Artificial; Metalloporphyrins
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v27_n17_p10714_VeronicaRivas

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Citas:

---------- APA ----------
Verónica Rivas, M., Méndez De Leo, L.P., Hamer, M., Carballo, R. & Williams, F.J. (2011) . Self-assembled monolayers of disulfide Cu porphyrins on au surfaces: Adsorption induced reduction and demetalation. Langmuir, 27(17), 10714-10721.
http://dx.doi.org/10.1021/la2020836
---------- CHICAGO ----------
Verónica Rivas, M., Méndez De Leo, L.P., Hamer, M., Carballo, R., Williams, F.J. "Self-assembled monolayers of disulfide Cu porphyrins on au surfaces: Adsorption induced reduction and demetalation" . Langmuir 27, no. 17 (2011) : 10714-10721.
http://dx.doi.org/10.1021/la2020836
---------- MLA ----------
Verónica Rivas, M., Méndez De Leo, L.P., Hamer, M., Carballo, R., Williams, F.J. "Self-assembled monolayers of disulfide Cu porphyrins on au surfaces: Adsorption induced reduction and demetalation" . Langmuir, vol. 27, no. 17, 2011, pp. 10714-10721.
http://dx.doi.org/10.1021/la2020836
---------- VANCOUVER ----------
Verónica Rivas, M., Méndez De Leo, L.P., Hamer, M., Carballo, R., Williams, F.J. Self-assembled monolayers of disulfide Cu porphyrins on au surfaces: Adsorption induced reduction and demetalation. Langmuir. 2011;27(17):10714-10721.
http://dx.doi.org/10.1021/la2020836