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Abstract:

Reduction of alizarin molecules coupled to TiO2 nanoparticles (A@TiO2) occurs on UV irradiation in the presence of a sacrificial electron donor. Evidence is presented that reduction is mediated by conduction-band electrons and yields a 1,2,9,10-tetrahydroxyanthracene species which remains coupled to the TiO2 nanoparticles. The spectrum of the reduced complex displays two overlapping broad bands centred at 480 and 650 nm which can harvest visible photons besides 900 nm, in agreement with theoretical predictions by TDDFT. The potential relevance of the dual-redox behaviour of strongly TiO2 coupled anthraquinone dyes in the field of photocatalysis and in connection with their utilization in the development of dye-sensitized TiO2 solar cells is briefly discussed. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.

Registro:

Documento: Artículo
Título:Electron transfer from photoexcited TiO2 to Chelating alizarin molecules: Reversible photochromic effect in Alizarin@TiO2 under UV irradiation
Autor:Iorio, Y.D.; Brusa, M.A.; Feldhoff, A.; Grela, M.A.
Filiación:Departamento de Quimica, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, B7602AYL Mar de Plata-Buenos Aires, Argentina
Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Callinstraße 3-3, 30167 Hannover, United Kingdom
Idioma: Inglés
Palabras clave:Charge transfer; Electron transfer photochromism; Quinones; Semiconductors
Año:2009
Volumen:10
Número:7
Página de inicio:1077
Página de fin:1083
DOI: http://dx.doi.org/10.1002/cphc.200800752
Título revista:ChemPhysChem
Título revista abreviado:ChemPhysChem
ISSN:14394235
CODEN:CPCHF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14394235_v10_n7_p1077_Iorio

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Citas:

---------- APA ----------
Iorio, Y.D., Brusa, M.A., Feldhoff, A. & Grela, M.A. (2009) . Electron transfer from photoexcited TiO2 to Chelating alizarin molecules: Reversible photochromic effect in Alizarin@TiO2 under UV irradiation. ChemPhysChem, 10(7), 1077-1083.
http://dx.doi.org/10.1002/cphc.200800752
---------- CHICAGO ----------
Iorio, Y.D., Brusa, M.A., Feldhoff, A., Grela, M.A. "Electron transfer from photoexcited TiO2 to Chelating alizarin molecules: Reversible photochromic effect in Alizarin@TiO2 under UV irradiation" . ChemPhysChem 10, no. 7 (2009) : 1077-1083.
http://dx.doi.org/10.1002/cphc.200800752
---------- MLA ----------
Iorio, Y.D., Brusa, M.A., Feldhoff, A., Grela, M.A. "Electron transfer from photoexcited TiO2 to Chelating alizarin molecules: Reversible photochromic effect in Alizarin@TiO2 under UV irradiation" . ChemPhysChem, vol. 10, no. 7, 2009, pp. 1077-1083.
http://dx.doi.org/10.1002/cphc.200800752
---------- VANCOUVER ----------
Iorio, Y.D., Brusa, M.A., Feldhoff, A., Grela, M.A. Electron transfer from photoexcited TiO2 to Chelating alizarin molecules: Reversible photochromic effect in Alizarin@TiO2 under UV irradiation. ChemPhysChem. 2009;10(7):1077-1083.
http://dx.doi.org/10.1002/cphc.200800752