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Electron Transfer from Photoexcited TiO~2~ to Chelating Alizarin Molecules: Reversible Photochromic Effect in Alizarin@TiO~2~ under UV Irradiation by Yesica Di Iorio; Marta A. Brusa; A. Feldhoff; María A. Grela is a Chemistry article available to read on EtoBox.

What is Electron Transfer from Photoexcited TiO~2~ to Chelating Alizarin Molecules: Reversible Photochromic Effect in Alizarin@TiO~2~ under UV Irradiation about?

## Abstract Reduction of alizarin molecules coupled to TiO~2~ nanoparticles occurs on UV irradiation in the presence of a sacrificial electron donor. Reduction is mediated by conduction‐band electrons and yields a 1,2,9,10‐tetrahydroxyanthracene species which remains coupled to the TiO~2~ nanoparticles (see figure). The process can be reversed by addition of an acceptor (i.e. oxygen).magnified image __Reduction of alizarin molecules coupled to TiO~2~ nanoparticles (A@TiO~2~) 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 TiO~2~ 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 TiO~2~ coupled anthraquinone dyes in the field of photocatalysis and in connection with their utilization in the development of dye‐sensitized TiO~2~ solar cells is briefly discussed.__

Who reads Electron Transfer from Photoexcited TiO~2~ to Chelating Alizarin Molecules: Reversible Photochromic Effect in Alizarin@TiO~2~ under UV Irradiation?

Author

Yesica Di Iorio; Marta A. Brusa; A. Feldhoff; María A. Grela

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 1439-4235)

Published

2009

Language

EN

Field

Chemistry (Physical Sciences)