Photosensitization of colloidal TiO2 with ZnTPP and pyrene
By:Kathiravan, A (Kathiravan, A.)[ 1 ] ; Anbazhagan, V (Anbazhagan, V.)[ 1 ] ; Jhonsi, MA (Jhonsi, M.
Asha)[ 1 ] ; Renganathan, R (Renganathan, R.)[ 1 ]
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN
PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
Volume: 222
Issue: 4
Pages: 647-654
DOI: 10.1524/zpch.2008.5299
Published: 2008
View Journal Information
Abstract
The interaction of Zinc(II) tetraphenyl porphyrin (ZnTPP) and pyrene with colloidal TiO2 was studied
by absorption and fluorescence spectroscopy. Upon excitation of its absorption band, the
fluorescence emission of ZnTPP and pyrene was quenched by colloidal TiO2. The bimolecular
quenching rate constant (k(q)) is 4.09 X 10(11) M(-1)s(-1) for ZnTPP and 2.09 X 10(9) M(-1)s(-1) for
pyrene. ZnTPP and pyrene adsorbed on colloidal TiO2 can participate in the sensitization process by
injecting electrons from their excited states into the conduction band of TiO2. The mechanism is
discussed on the basis of free energy change (Delta G(et)) obtained from Rehm-Weller equation
considering quenching rate constants and conduction band potential of colloidal TiO2.
Keywords
Author Keywords:ZnTPP; fluorescence quenching; photoinduced electron transfer; TiO2
KeyWords Plus:INTERFACIAL ELECTRON-TRANSFER; PARTICULATE
SYSTEMS; SEMICONDUCTOR; PHOTOELECTROCHEMISTRY; DYES;ACETONITRILE; PORPHY
RINS; EFFICIENCY; REDUCTION; DYNAMICS
Author Information
Reprint Address: Renganathan, R (reprint author)
Bharathidasan Univ, Sch Chem, Tiruchchirappalli 620024, Tamil Nadu, India.
Addresses:
[ 1 ] Bharathidasan Univ, Sch Chem, Tiruchchirappalli 620024, Tamil Nadu, India
E-mail Addresses:rrengas@gmail.com
Publisher
OLDENBOURG VERLAG, LEKTORAT MINT, POSTFACH 80 13 60, D-81613 MUNICH, GERMANY
Categories / Classification
Research Areas:Chemistry
Web of Science Categories:Chemistry, Physical
Document Information
Document Type:Article
Language:English
Accession Number: WOS:000255325300004
ISSN: 0942-9352
Other Information
IDS Number: 293HC
Cited References in Web of Science Core Collection: 23
Times Cited in Web of Science Core Collection: 0