期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 13, 期 22, 页码 10762-10770出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0cp02568b
关键词
-
资金
- JSPS [20002429]
- Nissan Science Foundation
- HFSP
- National Science Foundation [MCB-0913022]
- University of Connecticut Research Foundation
Carotenoids containing a carbonyl group in conjugation with their polyene backbone are naturally-occurring pigments in marine organisms and are essential to the photosynthetic light-harvesting function in aquatic algae. These carotenoids exhibit spectral characteristics attributed to an intramolecular charge transfer (ICT) state that arise in polar solvents due to the presence of the carbonyl group. Here, we report the spectroscopic properties of the carbonyl carotenoid fucoxanthin in polar (methanol) and nonpolar (cyclohexane) solvents studied by steady-state absorption and femtosecond pump-probe measurements. Transient absorption associated with the optically forbidden S-1 (2(1)A(g)(-)) state and/or the ICT state were observed following one-photon excitation to the optically allowed S-2 (1(1)B(u)(+)) state in methanol. The transient absorption measurements carried out in methanol showed that the ratio of the ICT-to-S-1 state formation increased with decreasing excitation energy. We also showed that the ICT character was clearly visible in the steady-state absorption in methanol based on a Franck-Condon analysis. The results suggest that two spectroscopic forms of fucoxanthin, blue and red, exist in the polar environment.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据