Details
| Original language | English |
|---|---|
| Pages (from-to) | 1077-1083 |
| Number of pages | 7 |
| Journal | ChemPhysChem |
| Volume | 10 |
| Issue number | 7 |
| Early online date | 4 May 2009 |
| Publication status | Published - 11 May 2009 |
Abstract
Reduction of alizarin molecules coupled to TiO2 nanoparticles (A@TiO2) 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 TiO2 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 TiO2 coupled anthraquinone dyes in the field of photocatalysis and in connection with their utilization in the development of dye-sensitized TiO2 solar cells is briefly discussed.
Keywords
- Charge transfer, Electron transfer photochromism, Quinones, Semiconductors
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: ChemPhysChem, Vol. 10, No. 7, 11.05.2009, p. 1077-1083.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Electron transfer from photoexcited TiO2 to Chelating alizarin molecules
T2 - Reversible photochromic effect in Alizarin@TiO2 under UV irradiation
AU - Iorio, Yesica Di
AU - Brusa, Marta A.
AU - Feldhoff, Armin
AU - Grela, María A.
PY - 2009/5/11
Y1 - 2009/5/11
N2 - Reduction of alizarin molecules coupled to TiO2 nanoparticles (A@TiO2) 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 TiO2 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 TiO2 coupled anthraquinone dyes in the field of photocatalysis and in connection with their utilization in the development of dye-sensitized TiO2 solar cells is briefly discussed.
AB - Reduction of alizarin molecules coupled to TiO2 nanoparticles (A@TiO2) 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 TiO2 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 TiO2 coupled anthraquinone dyes in the field of photocatalysis and in connection with their utilization in the development of dye-sensitized TiO2 solar cells is briefly discussed.
KW - Charge transfer
KW - Electron transfer photochromism
KW - Quinones
KW - Semiconductors
UR - http://www.scopus.com/inward/record.url?scp=66449089124&partnerID=8YFLogxK
U2 - 10.1002/cphc.200800752
DO - 10.1002/cphc.200800752
M3 - Article
AN - SCOPUS:66449089124
VL - 10
SP - 1077
EP - 1083
JO - ChemPhysChem
JF - ChemPhysChem
SN - 1439-4235
IS - 7
ER -