皮秒共振拉曼光谱观察到叶黄素聚集体中的高效单重态裂变。
High-yield singlet fission in a zeaxanthin aggregate observed by picosecond resonance Raman spectroscopy.
机构信息
Department of Chemistry and Biochemistry, University of California-San Diego, 9500 Gilman Drive MC 0314, La Jolla, California 92093-0314, USA.
出版信息
J Am Chem Soc. 2010 Oct 13;132(40):13988-91. doi: 10.1021/ja102851m.
We report high-yield triplet generation by singlet fission upon photoexcitation of a new aggregate of the carotenoid all-trans 3R,3'R-zeaxanthin. The yield is determined by picosecond time-resolved resonance Raman spectroscopy, which allows direct characterization and quantification of triplet excited-state signatures and ground-state depletion. The technique and analysis reveals that triplets form within picoseconds. A quantum yield of 90-200% is derived with the assumption of weak exciton-coupling in the zeaxanthin aggregate.
我们报告了在新型类胡萝卜素全反式 3R,3'R-玉米黄质聚集体的光激发下，通过单重态裂变产生高效三重态的情况。产率通过皮秒时间分辨共振拉曼光谱法确定，该方法允许直接对三重激发态特征和基态消耗进行定性和定量分析。该技术和分析表明，三重态在皮秒内形成。假设玉米黄质聚集体中的激子耦合较弱，得出的量子产率为 90-200%。
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