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Titolo:
Time-resolved optical spectroscopy of heterosupramolecular assemblies based on nanostructured TiO2 films modified by chemisorption of covalently linked ruthenium and viologen complex components
Autore:
Merrins, A; Kleverlaan, C; Will, G; Rao, SN; Scandola, F; Fitzmaurice, D;
Indirizzi:
Natl Univ Ireland Univ Coll Dublin, Dept Chem, Dublin 4, Ireland Natl UnivIreland Univ Coll Dublin Dublin Ireland 4 m, Dublin 4, Ireland Univ Ferrara, Dipartmento Chim, I-44100 Ferrara, Italy Univ Ferrara Ferrara Italy I-44100 artmento Chim, I-44100 Ferrara, Italy
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 15, volume: 105, anno: 2001,
pagine: 2998 - 3004
SICI:
1520-6106(20010419)105:15<2998:TOSOHA>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOINDUCED ELECTRON-TRANSFER; POTENTIOSTATIC MODULATION; POLYPYRIDINE COMPLEXES; NANOCRYSTALLINE TIO2; TITANIUM-DIOXIDE; LIGHT; CONVERSION; MOLECULES; HETEROSUPERMOLECULE; PHOTOCHEMISTRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Fitzmaurice, D Natl Univ Ireland Univ Coll Dublin, Dept Chem, Dublin 4, Ireland Natl Univ Ireland Univ Coll Dublin Dublin Ireland 4 eland
Citazione:
A. Merrins et al., "Time-resolved optical spectroscopy of heterosupramolecular assemblies based on nanostructured TiO2 films modified by chemisorption of covalently linked ruthenium and viologen complex components", J PHYS CH B, 105(15), 2001, pp. 2998-3004

Abstract

Described is the preparation of transparent nanostructured TiO2 (anatase) and Sb-doped SnO2 films supported on F-doped;conducting glass. Also described is the modification of these films by chemisorption of RV, bis(4,4 ' -bis(phosphonomethyl)-2,2 ' -bipyridine) (5-((1 ' -ethyl-4,4 ' -bipyridinediium-1-yl)butyl)-2,2 ' -bipyridine)ruthenium-(II) tetrakis(hexafluorophosphate), to form the covalent heterosupramolecular assemblies TiO2-RV and SnO2-RV, respectively. Visible light excitation of the ruthenium complex component, R, results in electron injection into the TiO2 or SnO2:Sb nanocrystal component (60%) and electron transfer to the viologen component (40%), V. In the case of TiO2-RV, however, long-lived formation of the radical cation of the V component, V.+, is observed. In the case of SnO2-RV, long-lived formation of V.+ is not observed. These findings, based on a detailed study of the time-resolved optical spectroscopy of TiO2-RV and SnO2:Sb-RV, are accounted for by proposing that long-lived V.+ is formed by TiO2 nanocrystal mediated electron transfer to the V component.

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Documento generato il 21/10/20 alle ore 16:29:06