Redox-controlled photosensitization of nanocrystalline titanium dioxide

Bibliographic description

title:	Redox-controlled photosensitization of nanocrystalline titanium dioxide
author:	Szaciłowski Konrad , Macyk Wojciech , Hebda Maciej, Stochel Grażyna
journal title:	ChemPhysChem
volume:	7
issue:	11
date of publication :	2006
pages:	2384-2391
ISSN:	1439-4235
eISSN:	1439-7641
DOI:	10.1002/cphc.200600407
language:	English
journal language:	English
abstract in English:	Photosensitization of nanocrystalline titanium dioxide materials has been achieved by chemisorption of the pentacyanothiamineferrate(II) complex, which offers a relatively high redox potential that determines the photoelectrochemical properties of the photosensitized $TiO_{2}$. The adsorbed pentacyanoferrate complex binds to $TiO_{2}$ through the cyanide bridge and forms a new surface complex characterized by a metal-to-metal charge-transfer transition (MMCT) ($Fe^{II}\rightarrow Ti^{IV}$). The photosensitization can be observed only at low potentials at which FeII moieties are present. Photocurrent switching between anodic and cathodic can be induced by varying either the photoelectrode potential or the wavelength of the incident light. Simple molecular modeling-together with spectroscopic and electrochemical measurements-allows the elucidation of the mechanism of the observed photoelectrochemical behavior.
keywords in English:	electrochemistry, metal–metal interactions, photochemistry, semiconductors, thiamine
affiliation:	Wydział Chemii : Zakład Chemii Nieorganicznej
type:	journal article
subtype:	academic paper

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