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Wavelength-dependent photoproduct formation of phycocyanobilin in solution - Indications for competing reaction pathways

Dietzek, Benjamin; Fey, Sonja; Matute, Ricardo A.; Gonzalez, Leticia; Schmitt, Michael; Popp, Juergen; Yartsev, Arkady LU and Hermann, Gudrun (2011) In Chemical Physics Letters 515(1-3). p.163-169
Abstract
Phycocyanobilin (PCB), an open-chain tetrapyrrole, makes up - slightly modified - the chromophore in phytochromes, the importance of which triggered model studies on the photochemistry of PCB in solution. We use pump-wavelength dependent femtosecond transient absorption spectroscopy including the near-IR region for probing to gain new insight into the photoreaction. The data reveal the coexistence of three ground state species: The dominant species PCBA undergoes photoreaction into PCBB and PCBC indicating a branching of the initial reaction path leading to formation of PCBB and PCBC. On this basis the photoreaction involves fast structural rearrangements within the tetrapyrrolic macrocycle, which are followed by slower rate-limiting... (More)
Phycocyanobilin (PCB), an open-chain tetrapyrrole, makes up - slightly modified - the chromophore in phytochromes, the importance of which triggered model studies on the photochemistry of PCB in solution. We use pump-wavelength dependent femtosecond transient absorption spectroscopy including the near-IR region for probing to gain new insight into the photoreaction. The data reveal the coexistence of three ground state species: The dominant species PCBA undergoes photoreaction into PCBB and PCBC indicating a branching of the initial reaction path leading to formation of PCBB and PCBC. On this basis the photoreaction involves fast structural rearrangements within the tetrapyrrolic macrocycle, which are followed by slower rate-limiting changes in the protonation state of the pyrrolenine/pyrrole rings. (C) 2011 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Chemical Physics Letters
volume
515
issue
1-3
pages
163 - 169
publisher
Elsevier
external identifiers
  • wos:000296551300031
  • scopus:80053913304
ISSN
0009-2614
DOI
10.1016/j.cplett.2011.08.086
language
English
LU publication?
yes
id
5335036b-cad6-40d4-ba21-26c2f83d7a33 (old id 2254516)
date added to LUP
2011-12-20 09:11:04
date last changed
2017-01-01 05:30:12
@article{5335036b-cad6-40d4-ba21-26c2f83d7a33,
  abstract     = {Phycocyanobilin (PCB), an open-chain tetrapyrrole, makes up - slightly modified - the chromophore in phytochromes, the importance of which triggered model studies on the photochemistry of PCB in solution. We use pump-wavelength dependent femtosecond transient absorption spectroscopy including the near-IR region for probing to gain new insight into the photoreaction. The data reveal the coexistence of three ground state species: The dominant species PCBA undergoes photoreaction into PCBB and PCBC indicating a branching of the initial reaction path leading to formation of PCBB and PCBC. On this basis the photoreaction involves fast structural rearrangements within the tetrapyrrolic macrocycle, which are followed by slower rate-limiting changes in the protonation state of the pyrrolenine/pyrrole rings. (C) 2011 Elsevier B.V. All rights reserved.},
  author       = {Dietzek, Benjamin and Fey, Sonja and Matute, Ricardo A. and Gonzalez, Leticia and Schmitt, Michael and Popp, Juergen and Yartsev, Arkady and Hermann, Gudrun},
  issn         = {0009-2614},
  language     = {eng},
  number       = {1-3},
  pages        = {163--169},
  publisher    = {Elsevier},
  series       = {Chemical Physics Letters},
  title        = {Wavelength-dependent photoproduct formation of phycocyanobilin in solution - Indications for competing reaction pathways},
  url          = {http://dx.doi.org/10.1016/j.cplett.2011.08.086},
  volume       = {515},
  year         = {2011},
}