高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (3): 492.

• 论文 • 上一篇    下一篇

荧光素蒽醌甲酯分子内光诱导电子转移及电荷分离态的检测

张海平, 周亚琳, 张曼华, 沈涛, 李玉良, 朱道本   

  1. 中国科学院化学研究所分子科学中心, 北京 100080
  • 收稿日期:2001-12-25 出版日期:2003-03-24 发布日期:2003-03-24
  • 通讯作者: 张曼华(1939年出生),女,研究员,博士生导师,从事光化学研究.E-mail:g214@ipc.ac.cn E-mail:g214@ipc.ac.cn
  • 基金资助:

    国家自然科学基金(批准号:50073025)资助

Photo-induced Intramolecular Electron Transfer of Fluorescein-anthraquinone-methyl Ester and Detection of Its Charge-separated State

ZHANG Hai-Ping, ZHOU Ya-Lin, ZHANG Man-Hua, SHEN Tao, LI Yu-Liang, ZHU Dao-Ben   

  1. Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2001-12-25 Online:2003-03-24 Published:2003-03-24

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被引次数

12

摘要： 合成了以荧光素为光敏剂的电子给体-受体二元化合物荧光素蒽醌甲酯(FL-AQ),用吸收光谱、荧光光谱、荧光寿命研究了该化合物在乙醇溶液中的光物理性质,并首次用纳秒级瞬态吸收光谱检测了此化合物分子内光诱导电子转移所形成的电荷分离态.在溶液中激发FL,电子可从FL有效地转移到AQ,其速率常数为3.95×109s-1,效率为95%.但由于电荷分离态寿命较短,瞬态吸收信号弱,若在此溶液中加入二氧化钛(TiO2)纳米胶体,使FL-AQ吸附在胶体上,电荷分离态信号明显增强.480nm处FL+·的寿命为11.1μs;560nm处AQ-·的寿命为8.93μs.

关键词: 荧光素蒽醌甲酯, 光诱导电子转移, 纳秒级瞬态吸收光谱, TiO2纳米胶体

Abstract: The diad composed of fluorescein and 2-methyl-anthraquinone(FL-AQ) has been synthesized and its photophysical properties have been examined by absorption, fluorescence spectroscopy and fluorescence lifetime. The charge-separated state formed by photo-induced intramolecular electron transfer has been detected by nanosecond transient absorption spectroscopy for the first time. When FL is excited in solution, the photo-induced electron transter from FL to AQ proceeds efficiently. The rate constant and the efficiency of intramolecular electron transfer are 3.95×109s-1 and 95% respectively. Its charge-separated state lifetime is too short to detect obviously by transient absorption spectroscopy. Adding of nanometer-size TiO2 colloids to FL-AQ ethanol solution can prolong the lifetime of charge-separated state, so its transient absorption signal is recorded significantly. The decay lifetime of FL+· at 480 nm is 11.1 μs. The decay lifetime of AQ-· at 560 nm is 8.93 μs.

Key words: Fluorescein-anthraquinone-methyl ester, Photo-induced electron transfer, Nanosecond transient absorption spectroscopy, Titania nanometer colloids(TiO2)

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