高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (12): 2463.

• 研究论文 • 上一篇    下一篇

溶液中光诱导产生岩藻黄质自由基正离子的动力学机制

杨帆1,2,王天鹤2,王鹏2,韩瑞敏2,艾希成2,张建平2   

  1. 1. 吉林大学电子科学与工程学院, 集成光电子学国家重点实验室, 长春 130012;
    2. 中国人民大学化学系, 北京 100872
  • 收稿日期:2010-02-02 修回日期:2010-05-14 出版日期:2010-12-10 发布日期:2010-12-06
  • 通讯作者: 张建平 E-mail:jpzhang@chem.ruc.edu.cn
  • 作者简介:张建平, 男, 博士, 教授, 主要从事物理化学的研究.
  • 基金资助:

    国家自然科学基金(批准号: 20803091, 20703067)和中国人民大学科学研究基金(中央高校基本科研业务费专项资金)资助.

Mechanism of Photoinduced Formation Fucoxanthin Radical Cation in Organic Solvents

YANG Fan1,2, WANG Tian-He2, WANG Peng2, HAN Rui-Min2, AI Xi-Cheng2, ZHANG Jian-Ping2*   

  1. 1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China;
    2. Department of Chemistry, Renmin University of China, Beijing 100872, China
  • Received:2010-02-02 Revised:2010-05-14 Online:2010-12-10 Published:2010-12-06
  • Contact: ZHANG Jian-Ping E-mail:jpzhang@chem.ruc.edu.cn
  • About author:张建平, 男, 博士, 教授, 主要从事物理化学的研究.
  • Supported by:

    国家自然科学基金(批准号: 20803091, 20703067)和中国人民大学科学研究基金(中央高校基本科研业务费专项资金)资助.

摘要: 本文对比研究了岩藻黄质(Fuc)在氯仿和甲醇溶液中光诱导生成自由基正离子(Fuc??)的动力学过程,考察了两种不同溶剂中Fuc??产生机制的差异。我们采用光谱电化学方法结合纳秒时间分辨吸收光谱技术,通过比较直接光激发和三重态敏化两种不同方式诱导生成Fuc??的动力学过程,发现在氯仿溶液中Fuc??主要源于Fuc的单重激发态(S2),而在甲醇溶液中,则主要源于Fuc的三重激发态(T1)。

关键词: 岩藻黄质, 自由基正离子, 时间分辨吸收光谱, 光谱电化学

Abstract: Kinetics of fucoxanthin radical cation (Fuc??) formation in chloroform and in methanol were comparatively studied by means of nanosecond time-resolved absorption spectroscopy combined with spetroelectrochemistry. Direct photoexcitation and anthracene-sensitized triplet excitation, respectively, were used to initiate the photochemistry of different fucoxanthin solutions. It was found that in chloroform Fuc?? was mainly formed from the singlet excited state of Fuc (S2), whereas in methanol it was mainly formed from the lowest triplet excited state of Fuc (T1).

Key words: Fucoxanthin, Radical cation, Nanosecond time-resolved absorption spectroscopy, Spetroelectrochemistry

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