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Energy transfer within Zn-porphyrin dendrimers: Study of the singlet-singlet annihilation kinetics

Larsen, Jane LU ; Brüggemann, Ben LU ; Polivka, Tomas LU ; Sundström, Villy LU ; Åkesson, Eva LU ; Sly, J and Crossley, MJ (2005) In The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory 109(47). p.10654-10662
Abstract
In this article, we explore energy transfer processes within a series of Zn-porphyrin-appended dendrimers by means of excitation intensity dependent transient absorption measurements. We report singlet-singlet annihilation on two distinct time scales of 18 +/- 5 ps and 130 +/- 10 ps in the dimer and the dendrimers. The two distinct processes reflect the presence of two structural conformer distributions. Analysis of the singlet-singlet annihilation transient kinetics shows that sequential annihilation occurs within subunits up to four Zn-porphyrins in the dendrimers. The onset of the singlet-singlet annihilation process depending on the size of the Molecule reveals a difference in the number Of Communicating Zn-porphyrins. We further... (More)
In this article, we explore energy transfer processes within a series of Zn-porphyrin-appended dendrimers by means of excitation intensity dependent transient absorption measurements. We report singlet-singlet annihilation on two distinct time scales of 18 +/- 5 ps and 130 +/- 10 ps in the dimer and the dendrimers. The two distinct processes reflect the presence of two structural conformer distributions. Analysis of the singlet-singlet annihilation transient kinetics shows that sequential annihilation occurs within subunits up to four Zn-porphyrins in the dendrimers. The onset of the singlet-singlet annihilation process depending on the size of the Molecule reveals a difference in the number Of Communicating Zn-porphyrins. We further report a full characterization of the transient absorption kinetics of the monomer over a spectral range from 450 to 730 nm. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory
volume
109
issue
47
pages
10654 - 10662
publisher
The American Chemical Society
external identifiers
  • wos:000233684700005
  • scopus:29144432682
ISSN
1520-5215
DOI
10.1021/jp053514z
language
English
LU publication?
yes
id
7b18feb1-51f9-4213-b4b7-62d37b1eeb85 (old id 151787)
date added to LUP
2007-07-03 13:58:40
date last changed
2017-10-08 04:11:52
@article{7b18feb1-51f9-4213-b4b7-62d37b1eeb85,
  abstract     = {In this article, we explore energy transfer processes within a series of Zn-porphyrin-appended dendrimers by means of excitation intensity dependent transient absorption measurements. We report singlet-singlet annihilation on two distinct time scales of 18 +/- 5 ps and 130 +/- 10 ps in the dimer and the dendrimers. The two distinct processes reflect the presence of two structural conformer distributions. Analysis of the singlet-singlet annihilation transient kinetics shows that sequential annihilation occurs within subunits up to four Zn-porphyrins in the dendrimers. The onset of the singlet-singlet annihilation process depending on the size of the Molecule reveals a difference in the number Of Communicating Zn-porphyrins. We further report a full characterization of the transient absorption kinetics of the monomer over a spectral range from 450 to 730 nm.},
  author       = {Larsen, Jane and Brüggemann, Ben and Polivka, Tomas and Sundström, Villy and Åkesson, Eva and Sly, J and Crossley, MJ},
  issn         = {1520-5215},
  language     = {eng},
  number       = {47},
  pages        = {10654--10662},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory},
  title        = {Energy transfer within Zn-porphyrin dendrimers: Study of the singlet-singlet annihilation kinetics},
  url          = {http://dx.doi.org/10.1021/jp053514z},
  volume       = {109},
  year         = {2005},
}