影像科学与光化学 ›› 1996, Vol. 14 ›› Issue (2): 108-114.DOI: 10.7517/j.issn.1674-0475.1996.02.108

• 研究论文 • 上一篇    下一篇

不同位置取代的三氰基乙烯基蒽的光谱行为的研究

王华, 陈景荣, 张宝文, 曹怡   

  1. 中国科学院感光化学研究所光化学开放实验室, 北京 100101
  • 收稿日期:1995-08-09 修回日期:1995-11-29 出版日期:1996-05-20 发布日期:1996-05-20
  • 通讯作者: 曹怡
  • 基金资助:
    国家自然科学基金,国家科学技术委员会基础性研究重大课题

A STUDY OF SPECTROSCOPIC BEHAVIOR OF ANTHRACENE SUBSTITUTED BY TRICYANOVINYL IN DIFFERENT POSITION

WANG Hua, CHEN Jingrong, ZHANG Baowen, CAO Yi   

  1. Lab of Photochemistry, Institute of Photographic Chemistry, The Chinese Academy of Sciences, Beijing 100101, P. R. China
  • Received:1995-08-09 Revised:1995-11-29 Online:1996-05-20 Published:1996-05-20

摘要: 本文设计合成了两个典型的共轭的电子给体与电子受体(D-A)化合物:2-三氰基乙烯基蒽(2-TCVA)与9-三氰基乙烯基蒽(9-TCVA),通过极性效应,温度效应对它们基态与激发态的光谱行为进行了表征。研究表明:这两个化合物均表现出显著的电荷转移(CT)吸收峰,分子受光激发后,9-TCVA只能在非极性溶剂中产生分子内电荷转移(ICT)态荧光,而2-TCVA在极性与非极性溶剂中都能从ICT态发光。另外,温度效应显示冻结态下,2-TCVA只发射ICT态荧光,而9-TCVA既发射类蒽(anthracene-like)荧光又发射ICT态荧光,造成这一现象的主要原因可能是2-TCVA与9-TCVA分子平面性上的差异而引起分子内电荷转移相互作用不同所致。文中还利用了Bilot-Kawski公式估算了化合物2-TCVA在激发态与基态时偶极矩的差值为18.8D。

关键词: 分子内电荷转移, 电荷分离, 螺旋共轭

Abstract: Two conjugating electron donor-acceptor(D-A)compounds,2-tricyanovinyl anthracene(2-TCVA)and 9-tricyanovinyl anthracene(9-TCVA),were synthesized and their spectroscopic properties in a series of solvents with different polarity and at different temperature were studied.The results reveal that the structure of 2-TCVA is more planar than 9TCVA at their ground state and the charge transfer bands show up in their absorption spectra.Fluorescence emits from intramolecular charge transfer(ICT)state for 9-TCVA in nonpolar solvents,while for 2-TCVA in both polar and non-polar solvents. When the molecule was freezed,2-TCVA emits fluorescence from its ICT state,while 9-TCVA emits dual fluorescence from its local and ICT state,due to the structure of 2-TCVA is more planar than 9-TCVA. The dipole moment difference between excited state and ground state for 2-TC-VA was estimated as 18.8 D.

Key words: intramolecular charge transfer, charge separation, spiral conjugation