Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 3, Issue 18, Pages 2659-2664Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz300612c
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Funding
- Nissan Science Foundation
- Human Frontier Science Program
- Grants-in-Aid for Scientific Research [23654151, 23684020, 22340085] Funding Source: KAKEN
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Fucoxanthin-chlorophyll-a/c protein (FCP) complexes from brown algae Cladosiphon okamuranus TOKIDA (Okinawa Mozuku in Japanese) contain the only species of carbonyl carotenoid, fucoxanthin, which exhibits spectral characteristics attributed to an intramolecular charge-transfer (ICT) property that arises in polar environments due to the presence of the carbonyl group in its polyene backbone. Here, we investigated the role of the ICT property of fucoxanthin in ultrafast energy transfer to chlorophyll-a/c in brown algal photosynthesis using femtosecond pump-probe spectroscopic measurements. The observed excited-state dynamics show that the ICT character of fucoxanthin in FCP extends its absorption band to longer wavelengths and enhances its electronic interaction with chlorophyll-a molecules, leading to efficient energy transfer from fucoxanthin to chlorophyll-a.
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