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J Am Chem Soc. 2010 Oct 13;132(40):13988-91. doi: 10.1021/ja102851m.

High-yield singlet fission in a zeaxanthin aggregate observed by picosecond resonance Raman spectroscopy.

Author information

1
Department of Chemistry and Biochemistry, University of California-San Diego, 9500 Gilman Drive MC 0314, La Jolla, California 92093-0314, USA.

Abstract

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.

PMID:
20857932
DOI:
10.1021/ja102851m

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