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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 orcid ; 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 (ACS)
external identifiers
  • wos:000233684700005
  • scopus:29144432682
ISSN
1520-5215
DOI
10.1021/jp053514z
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)
id
7b18feb1-51f9-4213-b4b7-62d37b1eeb85 (old id 151787)
date added to LUP
2016-04-01 15:40:19
date last changed
2023-04-07 13:57:46
@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 (ACS)}},
  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}},
  doi          = {{10.1021/jp053514z}},
  volume       = {{109}},
  year         = {{2005}},
}