CJCU

Chem. J. Chinese Universities

• 研究论文 • Previous Articles     Next Articles

Singlet Excited State Energy Transfer Among Pigments in HL-LH2

ZHAO Xiao-Hui1,2,3, LIANG Jun1,2, MA Fei1,2, SU Wen-Jie2, WANG Peng2*, FU Li-Min2, AI Xi-Cheng2, ZHANG Jian-Ping1,2   

    1. Beijing National Laboratory for Molecular Science(BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;
    2. Department of Chemistry, College of Science, Renmin University of China, Beijing 100872, China;
    3. College of Physics Science and Technology, Hebei University, Baoding 071002, China
  • Received:2007-05-21 Revised:1900-01-01 Online:2008-01-10 Published:2008-01-10
  • Contact: WANG Peng

PDF (PC)

Cited

5

Abstract: Under excitation of 500 and 800 nm, femto-second time-resolved absorption spectroscopy was used to observe the characteristic absorption of carotenoids(Cars) with various conjugation lengths and bacteriochlorophyll a(BChl a) with different Qy bands, i.e. B800 and B850 aggregates, in the high light cultured peri-pheral light-harvesting complex(HL-LH2) from Rhodopseudomonas(Rps.) palustris. Spectroscopic dynamics analysis suggests that the complicated singlet excited state energy equilibrium possibly exists among various carotenoids and multi-channel singlet excited state energy transfer occurs between Cars and BChl as. B800 mainly accepts the excitation energy from S1 and S2 states of Cars, and B850 from the S1 state of Car with the longest conjugation length(conjugated double bonds number n=13) and B800 as well. The whole singlet excited state energy transfer process can be completed in 3—5 ps.

Key words: Peripheral light-harvesting complex, Bacteriochlorophyll, Carotenoid, Excited state energy transfer, Time-resolved spectrum

CLC Number: 

TrendMD: