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Title: Triplet–triplet energy transfer in artificial and natural photosynthetic antennas

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

In photosynthetic organisms, protection against photo-oxidative stress due to singlet oxygen is provided by carotenoid molecules, which quench chlorophyll triplet species before they can sensitize singlet oxygen formation. In anoxygenic photosynthetic organisms, in which exposure to oxygen is low, chlorophyll to carotenoid triplet-triplet energy transfer (T-TET) is slow, in the tens of nanoseconds range, while it is ultrafast in the oxygen-rich chloroplasts of oxygen evolving photosynthetic organisms. In order to better understand the structural features and resulting electronic coupling that leads to T-TET dynamics adapted to ambient oxygen activity, we have carried out experimental and theoretical studies of two isomeric carotenoporphyrin molecular dyads having different conformations and therefore different interchromophore electronic interactions. This pair of dyads reproduces the characteristics of fast and slow T-TET including a resonance Raman based spectroscopic marker of strong electronic coupling and fast T-TET that has been observed in photosynthesis. As identified by DFT calculations, the spectroscopic marker associated with fast T-TET is due primarily to a geometrical perturbation of the carotenoid backbone in the triplet state induced by the interchromophore interaction. This is also the case for the natural systems, as demonstrated by the hybrid quantum mechanics/molecular mechanics (QM/MM) simulations of light harvesting proteins from oxygenic (LHCII) and anoxygenic organisms (LH2). In conclusion, both DFT and EPR analysis further indicates that upon T-TET, the triplet wave function is localized on the carotenoid in both dyads.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE; European Research Council (ERC); Agence Nationale de la recherche (ANR); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
FG02-03ER15393; SC0001059; AC02-06CH11357
OSTI ID:
1366576
Alternate ID(s):
OSTI ID: 1374200
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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