Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (4): 627-635.doi: 10.1007/s40242-019-9097-2

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Excited State Properties of Fucoxanthin Aggregates

ZUO Jialing, TAN Liming, XU Yi, MA Yingchao, DONG Jia, WANG Peng, ZHANG Jianping   

  1. Department of Chemistry, Renmin University of China, Beijing 100872, P. R. China
  • Received:2019-04-04 Revised:2019-04-29 Online:2019-08-01 Published:2019-08-01
  • Contact: WANG Peng E-mail:wpeng@iccas.ac.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(Nos.21273282, 21673289, 21673288, 21173265) and the International Cooperation Project Between China and Russia(NSFC-RFBR)(No.21411130185).

Abstract: The structure and excited state properties of the H-and J-aggregates of the marine carbonyl carotenoid, fucoxanthin(Fx), were studied by various spectroscopic methods, and compared with those of Fx monomers in polar organic solvents. The fluorescent analysis indicated that the higher vibronic states of S2 contribute more to populating the S1 state, from which fluorescent emission mainly originates. Resonance Raman and density functional theory calculations confirmed the ‘card-packed’ and ‘head-to-tail’ structures of the H-and J-aggregates of Fx, respectively. An fs time-resolved absorption study proved the coexistence of S1 and intramolecular charge transfer relaxation pathways upon excitation to the S2 state for both the monomers and aggregates.

Key words: Fucoxanthin aggregate, Resonance Raman, fs Time-resolved absorption, Excited state property, Singlet fission