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A Near-Infrared Transient Absorption Study of the Excited-State Dynamics of the Carotenoid Spirilloxanthin in Solution and in the LH1 Complex of Rhodospirillum rubrum.

Papagiannakis, E; van Stokkum, I H M; van Grondelle, R; Niederman, R A; Zigmantas, Donatas LU ; Sundström, Villy LU and Polivka, Tomas LU (2003) In The Journal of Physical Chemistry Part B 107(40). p.11216-11223
Abstract
The spectroscopic properties of spirilloxanthin in an nhexane solution and bound to the core light-harvesting LH1) complex of Rhodospirillum rubrum were studied by near infrared ultrafast transient absorption spectroscopy. Global analysis of the kinetic traces measured after excitation of spirilloxanthin to the S2 (1Bu +) state enabled us to estimate the species-associated difference spectra that correspond to the excited-state absorption signals originating from the S1 (2Ag-) and S2 states. Analysis of the absorption originating from the S2 state has provided further insight into the characterization of the spirilloxanthin excited states, while by analyzing the profile of the S1-S2 transition, we place the energy of the S1 state of... (More)
The spectroscopic properties of spirilloxanthin in an nhexane solution and bound to the core light-harvesting LH1) complex of Rhodospirillum rubrum were studied by near infrared ultrafast transient absorption spectroscopy. Global analysis of the kinetic traces measured after excitation of spirilloxanthin to the S2 (1Bu +) state enabled us to estimate the species-associated difference spectra that correspond to the excited-state absorption signals originating from the S1 (2Ag-) and S2 states. Analysis of the absorption originating from the S2 state has provided further insight into the characterization of the spirilloxanthin excited states, while by analyzing the profile of the S1-S2 transition, we place the energy of the S1 state of all-trans-spirilloxanthin at 11 500 cm-1, both in solution and in the LH1 complex. This low value excludes excitation energy transfer from the S1 state of spirilloxanthin to bacteriochlorophyll in the LH1 complex of Rs. rubrum and explains the observed low energy transfer efficiency from spirilloxanthin to bacteriochlorophyll in that complex. Our results indicate that the S* state of spirilloxanthin, which was recently found both in solution and in the LH1 complex (Gradinaru, C. C., et al. Proc. Natl. Acad. Sci. U.S.A. 2001, 98, 2364), does not exhibit detectable spectral features in the near-infrared region. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
107
issue
40
pages
11216 - 11223
publisher
The American Chemical Society
external identifiers
  • wos:000185756900034
  • scopus:0242323638
ISSN
1520-5207
DOI
10.1021/jp034931j
language
English
LU publication?
yes
id
01299526-3c32-4d50-9d14-05313580f1d7 (old id 128186)
date added to LUP
2007-07-03 14:39:20
date last changed
2018-05-29 11:23:30
@article{01299526-3c32-4d50-9d14-05313580f1d7,
  abstract     = {The spectroscopic properties of spirilloxanthin in an nhexane solution and bound to the core light-harvesting LH1) complex of Rhodospirillum rubrum were studied by near infrared ultrafast transient absorption spectroscopy. Global analysis of the kinetic traces measured after excitation of spirilloxanthin to the S2 (1Bu +) state enabled us to estimate the species-associated difference spectra that correspond to the excited-state absorption signals originating from the S1 (2Ag-) and S2 states. Analysis of the absorption originating from the S2 state has provided further insight into the characterization of the spirilloxanthin excited states, while by analyzing the profile of the S1-S2 transition, we place the energy of the S1 state of all-trans-spirilloxanthin at 11 500 cm-1, both in solution and in the LH1 complex. This low value excludes excitation energy transfer from the S1 state of spirilloxanthin to bacteriochlorophyll in the LH1 complex of Rs. rubrum and explains the observed low energy transfer efficiency from spirilloxanthin to bacteriochlorophyll in that complex. Our results indicate that the S* state of spirilloxanthin, which was recently found both in solution and in the LH1 complex (Gradinaru, C. C., et al. Proc. Natl. Acad. Sci. U.S.A. 2001, 98, 2364), does not exhibit detectable spectral features in the near-infrared region.},
  author       = {Papagiannakis, E and van Stokkum, I H M and van Grondelle, R and Niederman, R A and Zigmantas, Donatas and Sundström, Villy and Polivka, Tomas},
  issn         = {1520-5207},
  language     = {eng},
  number       = {40},
  pages        = {11216--11223},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {A Near-Infrared Transient Absorption Study of the Excited-State Dynamics of the Carotenoid Spirilloxanthin in Solution and in the LH1 Complex of Rhodospirillum rubrum.},
  url          = {http://dx.doi.org/10.1021/jp034931j},
  volume       = {107},
  year         = {2003},
}