Ultrafast excited state dynamics of spirilloxanthin in solution and bound to core antenna complexes: identification of the S∗ and T1 states.
J Chem Phys
; 137(6): 064505, 2012 Aug 14.
Article
in En
| MEDLINE
| ID: mdl-22897291
ABSTRACT
Ultrafast excited state dynamics of spirilloxanthin in solution and bound to the light-harvesting core antenna complexes from Rhodospirillum rubrum S1 were investigated by means of femtosecond pump-probe spectroscopic measurements. The previously proposed S∗ state of spirilloxanthin was clearly observed both in solution and bound to the light-harvesting core antenna complexes, while the lowest triplet excited state appeared only with spirilloxanthin bound to the protein complexes. Ultrafast formation of triplet spirilloxanthin bound to the protein complexes was observed upon excitation of either spirilloxanthin or bacteriochlorophyll-a. The anomalous reaction of the ultrafast triplet formation is discussed in terms of ultrafast energy transfer between spirilloxanthin and bacteriochlorophyll-a.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Solutions
/
Bacterial Proteins
Type of study:
Diagnostic_studies
Language:
En
Journal:
J Chem Phys
Year:
2012
Document type:
Article