Direct observation of interfacial hole transfer from a photoexcited TiO2 particle to an adsorbed molecule SCN- by femtosecond diffuse reflectance spectroscopy

Citation
A. Furube et al., Direct observation of interfacial hole transfer from a photoexcited TiO2 particle to an adsorbed molecule SCN- by femtosecond diffuse reflectance spectroscopy, RES CHEM IN, 27(1-2), 2001, pp. 177-187
Citations number
25
Language
INGLESE
art.tipo
Review
Categorie Soggetti
Chemistry
Journal title
RESEARCH ON CHEMICAL INTERMEDIATES
ISSN journal
0922-6168 → ACNP
Volume
27
Issue
1-2
Year of publication
2001
Pages
177 - 187
Database
ISI
SICI code
0922-6168(2001)27:1-2<177:DOOIHT>2.0.ZU;2-4
Abstract
On the basis of transient absorption spectral measurements in the whole vis ible region using femtosecond diffuse reflectance spectroscopy, a hole tran sfer process from photoexcited TiO2 to an adsorbed molecule SCN- was elucid ated. In a TiO2 aqueous suspension with KSCN. absorption rise of dimer radi cal anion (SCN)(2)(.-) was observed indicating hole transfer. Interestingly , there were two rise components with <1 ps and several 100 ps, which were shorter in lower pH of the solution. Ultrafast hole transfer and subsequent intermolecular geometrical change of a dimmer radical anion are also discu ssed.