高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

HL-LH2中色素分子间的单重激发态能量传递

赵晓辉1,2,3, 梁俊1,2, 马菲1,2, 苏文杰2, 王鹏2, 付立民2, 艾希成2, 张建平1,2   

    1. 中国科学院化学研究所分子动态与稳态结构国家重点实验室, 北京分子科学国家实验室, 北京100080;
    2. 中国人民大学理学院化学系, 北京100872;
    3. 河北大学物理科学与技术学院, 保定 071002
  • 收稿日期:2007-05-21 修回日期:1900-01-01 出版日期:2008-01-10 发布日期:2008-01-10
  • 通讯作者: 王鹏

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

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被引次数

8

摘要： 采用飞秒时间分辨吸收光谱手段观测了在500和800 nm激发下高光培养的紫色光合细菌Rhodopseu-domonas(Rps). palustris外周捕光天线LH2(HL-LH2)中不同共轭链长类胡萝卜素(Carotenoid, 简称Car)和细菌叶绿素a(Bacteriachlorophyll a, 简称BChl a)的特征吸收光谱. 光谱动力学分析结果表明, HL-LH2中不同Car分子间可能存在复杂的单重激发态能量平衡过程, Car分子同时向BChl a分子发生多途径的单重激发态能量传递, B800主要接受来自Car的S2和S1态能量; B850则主要接受来自长共轭链Car(共轭双键数目n=13)的S1态和B800的激发态能量, 整个能量传递过程在3~5 ps内完成.

关键词: 外周捕光天线, 细菌叶绿素, 类胡萝卜素, 激发态能量传递, 时间分辨光谱

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

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