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Carballo, R.R.; Campodall' Orto, V.; Hurst, J.A.; Spiaggi, A.; Bonazzola, C.; Rezzano, I.N. "Covalently attached metalloporphyrins in LBL self-assembled redox polyelectrolyte thin films" (2008) Electrochimica Acta. 53(16):5215-5219
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Abstract:

A formylporphyrin has been covalently bound to Poly (Allylamine Hydrochloride) (PAH) and electrostatically self-assembled polyelectrolyte films, containing the attached metalloporphyrin, have been constructed. The UV-vis absorption band at 390 nm has been followed as core porphyrin marker. The reflection-absorption IR spectra of the gold films modified with layer-by-layer (LBL) polyelectrolytes were recorded after 6 and 12 layers. Characteristic infrared absorbance bands of porphyrin, PAH and PVS became more evident on increasing the number of bilayers. The absorption bands at 750, 1214 and 2960 cm-1, attributed at ν(S-O), νs(SO3-) and ν({double bond, long}NH2+), respectively, showed a linear growth (R2 > 0.99) with the number of adsorbed layers. A lower correlation coefficient was observed for the band at 1585 cm-1 attributed to Fe-protoporphyrin. In order to evaluate the electron transfer (ET) rate, the ΔEp of the [Fe(CN)6]4-/[Fe(CN)6]3- couple in solution was measured after covering the electrode. A proportional increase of the ΔEp with the number of layers is observed up to the 4th layer. After the second bilayer, the magnitude of the peak separation is highly related to the charge of the topmost layer. The method allowed controlling the film thickness via the number of deposited layers (LBL). The electrode described, resulted in a good catalyst for O2 reduction and sulfite oxidation. © 2008 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Covalently attached metalloporphyrins in LBL self-assembled redox polyelectrolyte thin films
Autor:Carballo, R.R.; Campodall' Orto, V.; Hurst, J.A.; Spiaggi, A.; Bonazzola, C.; Rezzano, I.N.
Filiación:Departmento de Química Analítica y Fisicoquímica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, CP 1113 Buenos Aires, Argentina
INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Pabellon 2, Ciudad Universitaria, CP 1428 Buenos Aires, Argentina
Palabras clave:Catalysis; Formylporphyrin; LBL; Polyelectrolyte films; Catalyst activity; Polyelectrolytes; Redox reactions; Self assembly; Formylporphyrin; Polyelectrolyte films; Thin films
Año:2008
Volumen:53
Número:16
Página de inicio:5215
Página de fin:5219
DOI: http://dx.doi.org/10.1016/j.electacta.2008.02.036
Título revista:Electrochimica Acta
Título revista abreviado:Electrochim Acta
ISSN:00134686
CODEN:ELCAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v53_n16_p5215_Carballo

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Citas:

---------- APA ----------
Carballo, R.R., Campodall' Orto, V., Hurst, J.A., Spiaggi, A., Bonazzola, C. & Rezzano, I.N. (2008) . Covalently attached metalloporphyrins in LBL self-assembled redox polyelectrolyte thin films. Electrochimica Acta, 53(16), 5215-5219.
http://dx.doi.org/10.1016/j.electacta.2008.02.036
---------- CHICAGO ----------
Carballo, R.R., Campodall' Orto, V., Hurst, J.A., Spiaggi, A., Bonazzola, C., Rezzano, I.N. "Covalently attached metalloporphyrins in LBL self-assembled redox polyelectrolyte thin films" . Electrochimica Acta 53, no. 16 (2008) : 5215-5219.
http://dx.doi.org/10.1016/j.electacta.2008.02.036
---------- MLA ----------
Carballo, R.R., Campodall' Orto, V., Hurst, J.A., Spiaggi, A., Bonazzola, C., Rezzano, I.N. "Covalently attached metalloporphyrins in LBL self-assembled redox polyelectrolyte thin films" . Electrochimica Acta, vol. 53, no. 16, 2008, pp. 5215-5219.
http://dx.doi.org/10.1016/j.electacta.2008.02.036
---------- VANCOUVER ----------
Carballo, R.R., Campodall' Orto, V., Hurst, J.A., Spiaggi, A., Bonazzola, C., Rezzano, I.N. Covalently attached metalloporphyrins in LBL self-assembled redox polyelectrolyte thin films. Electrochim Acta. 2008;53(16):5215-5219.
http://dx.doi.org/10.1016/j.electacta.2008.02.036