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Carotenoid and pheophytin on semiconductor surface: Self-assembly and photoinduced electron transfer

Pan, Jingxi LU ; Xu, Yunhua; Sun, Licheng; Sundström, Villy LU and Polivka, Tomas LU (2004) In Journal of the American Chemical Society 126(10). p.3066-3067
Abstract
Self-assembling of a carotenoid and pheophytin a into a supramolecular system was observed on the surface of nanocrystalline TiO2, and the photoinduced electron-transfer reactions within the system were studied by means of femtosecond transient absorption and laser flash photolysis techniques. Excitation of the pheophytin moiety results in ultrafast electron transfer from carotenoid to the excited pheophytin, creating a long-lived charge-separated state. Two decay pathways of the formed pheophytin a anion radical are proposed. The first is a direct back electron recombination forming a carotenoid triplet state on the nanosecond time scale, while the other is suggested to occur via electron injection to the TiO2 nanoparticle. These results... (More)
Self-assembling of a carotenoid and pheophytin a into a supramolecular system was observed on the surface of nanocrystalline TiO2, and the photoinduced electron-transfer reactions within the system were studied by means of femtosecond transient absorption and laser flash photolysis techniques. Excitation of the pheophytin moiety results in ultrafast electron transfer from carotenoid to the excited pheophytin, creating a long-lived charge-separated state. Two decay pathways of the formed pheophytin a anion radical are proposed. The first is a direct back electron recombination forming a carotenoid triplet state on the nanosecond time scale, while the other is suggested to occur via electron injection to the TiO2 nanoparticle. These results demonstrate that a self-assembled carotenoid-pheophytin system leads to an efficient reductive quenching of the pheophytin moiety, suggesting that a similar mechanism can operate also in natural photosynthetic systems. Moreover, the formation of a long-lived charge-separated state indicates that such self-assembling strategy may be also considered for novel dye-sensitized solar cell constructions and other artificial systems aiming to mimic the electron-transfer chain in natural photosynthesis. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of the American Chemical Society
volume
126
issue
10
pages
3066 - 3067
publisher
The American Chemical Society
external identifiers
  • wos:000220192000031
  • pmid:15012133
  • scopus:1642287597
ISSN
1520-5126
DOI
10.1021/ja031775l
language
English
LU publication?
yes
id
0ccb51bb-bcfb-4e10-a10c-c5ea263596f7 (old id 139074)
date added to LUP
2007-07-03 14:33:34
date last changed
2017-01-01 07:20:56
@article{0ccb51bb-bcfb-4e10-a10c-c5ea263596f7,
  abstract     = {Self-assembling of a carotenoid and pheophytin a into a supramolecular system was observed on the surface of nanocrystalline TiO2, and the photoinduced electron-transfer reactions within the system were studied by means of femtosecond transient absorption and laser flash photolysis techniques. Excitation of the pheophytin moiety results in ultrafast electron transfer from carotenoid to the excited pheophytin, creating a long-lived charge-separated state. Two decay pathways of the formed pheophytin a anion radical are proposed. The first is a direct back electron recombination forming a carotenoid triplet state on the nanosecond time scale, while the other is suggested to occur via electron injection to the TiO2 nanoparticle. These results demonstrate that a self-assembled carotenoid-pheophytin system leads to an efficient reductive quenching of the pheophytin moiety, suggesting that a similar mechanism can operate also in natural photosynthetic systems. Moreover, the formation of a long-lived charge-separated state indicates that such self-assembling strategy may be also considered for novel dye-sensitized solar cell constructions and other artificial systems aiming to mimic the electron-transfer chain in natural photosynthesis.},
  author       = {Pan, Jingxi and Xu, Yunhua and Sun, Licheng and Sundström, Villy and Polivka, Tomas},
  issn         = {1520-5126},
  language     = {eng},
  number       = {10},
  pages        = {3066--3067},
  publisher    = {The American Chemical Society},
  series       = {Journal of the American Chemical Society},
  title        = {Carotenoid and pheophytin on semiconductor surface: Self-assembly and photoinduced electron transfer},
  url          = {http://dx.doi.org/10.1021/ja031775l},
  volume       = {126},
  year         = {2004},
}