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

DCM衍生物双光子吸收截面的溶剂效应

苏文杰1, 姚宜山2, 李满宇1, 谭回1, 付立民1, 艾希成1, 王雪松2, 张建平1   

    1. 中国人民大学理学院化学系, 北京 100872;
    2. 中国科学院理化技术研究所, 北京 100080
  • 收稿日期:2008-04-18 修回日期:1900-01-01 出版日期:2009-02-10 发布日期:2009-02-10
  • 通讯作者: 付立民

Solvent Effects on the Two-photon Absorption Cross Section of DCM Derivatives

SU Wen-Jie1, YAO Yi-Shan2, LI Man-Yu1, TAN Hui1, FU Li-Min1*, AI Xi-Cheng1, WANG Xue-Song2, ZHANG Jian-Ping1   

    1. Department of Chemistry, Renmin University of China, Beijing 100872, China;
    2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2008-04-18 Revised:1900-01-01 Online:2009-02-10 Published:2009-02-10
  • Contact: FU Li-Min

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被引次数

5

摘要： 考察了以三苯胺基为给电子基团的4种不同DCM衍生物在有机溶剂中的单光子光物理性质(基态和激发态永久偶极矩差、光学跃迁偶极矩以及跃迁能量等), 并利用双光子诱导荧光法考察了溶剂对其双光子吸收截面(δtpa)的影响. 研究结果表明, DCM衍生物的光学跃迁具有显著的分子内电荷转移特性, 不同末端取代基主要影响其稳态光谱性质, 而分支结构数目主要影响其双光子吸收截面. 研究结果还发现, 双光子吸收截面随分子结构的变化趋势符合双能级模型, 拉电子基团为丙二腈和1,3-茚二酮的DCM衍生物的δtpa随溶剂介电常数的增加呈现不同的变化趋势.

关键词: 双光子吸收, 溶剂效应, 分子内电荷转移

Abstract: The One-photon photo-physical properties(difference in static dipole moments, transition dipole moment, transition energy, etc.) of four DCM derivatives, which contain triphenylamine centre, were investigated in a series of organic solvents, and the solvent effects on their two-photon absorption cross-sections(δtpa) were measured by means of two-photon induced fluorescence method. Steady spectra indicated that the excited states of these samples possess notable intramolecular charge transfer(ICT) character, and electron-withdrawing end groups had exerted large influences on the spectroscopic properties of these molecules, while the number of branch mainly influence the value of TPA cross-section. The differences in δtpa of the four samples can be well fitted by two-state expression of TPA. The trends of δ value with the increasing of solvent's dielectric constant are different by changing electron-withdrawing end groups.

Key words: Two-photon absorption, Solvent effect, Intra-molecular charge transfer

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