Chin. J. Org. Chem. ›› 2018, Vol. 38 ›› Issue (10): 2680-2692.DOI: 10.6023/cjoc201805004 Previous Articles     Next Articles

Articles

薁2/6-位芳基取代的模型化合物的设计合成及性质研究

高洪磊a,b, 杨笑迪c, 辛涵申b, 高铁阵b, 龚和贵a, 高希珂b   

  1. a 上海大学理学院化学系 上海 200444;
    b 中国科学院上海有机化学研究所 中国科学院有机功能分子合成与组装化学重点实验室 上海 200032;
    c 上海中医药大学科学与技术实验中心 上海 201203
  • 收稿日期:2018-05-02 修回日期:2018-06-03 发布日期:2018-06-06
  • 通讯作者: 杨笑迪,E-mail:yangxiaodi@shutcm.edu.cn;龚和贵,E-mail:hegui_gong@shu.edu.cn;高希珂,E-mail:gaoxk@mail.sioc.ac.cn E-mail:yangxiaodi@shutcm.edu.cn;hegui_gong@shu.edu.cn;gaoxk@mail.sioc.ac.cn
  • 基金资助:

    国家自然科学基金(No.21522209)和战略性先导科技专项B类(No.XDB12010100).

Design, Synthesis and Properties of 2/6-Aryl Substituted Azulene Derivatives

Gao Hongleia,b, Yang Xiaodic, Xin Hanshenb, Gao Tiezhenb, Gong Heguia, Gao Xikeb   

  1. a Department of Chemistry, College of Science, Shanghai University, Shanghai 200444;
    b Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032;
    c Experiment Center for Science and Technology, Shanghai University of Traditional Chinese Medicine, 1200 Cai Lun Road, Shanghai 201203
  • Received:2018-05-02 Revised:2018-06-03 Published:2018-06-06
  • Contact: 10.6023/cjoc201805004 E-mail:yangxiaodi@shutcm.edu.cn;hegui_gong@shu.edu.cn;gaoxk@mail.sioc.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (No. 21522209) and the Strategic Priority Research Program (No. XDB12010100).

Six 2/6-aryl substituted azulene derivatives 1~6 were designed and synthesised. Compounds 1~3 and 4~6 are 2-and 6-substituted derivatives, respectively, where the arly substituents were pentafluorobenzene, benzene and α-thiophene. The UV-Vis spectra, fluorescence spectra, electrochemical properties and proton-responsive properties of 1~6 were studied. To investigate the molecular sturcture, absorption spectra and energy levels of compounds 1~6, density functional theory (DFT) calculations were carried out. In comparison with the UV-Vis spectra of azulene, the absorption of S0→S2 transition of 1~6 showed red-shift (Δλ=6~68 nm). Owing to the strong electron-donating ability of α-thiophene group, remarkable bathochromic shifts of 3 and 6 (Δλ=68 and 48 nm, respectively) were obseved. The fluorescence spectra revealed that 4 (?F=0.082) has the highest fluorescence quantum yield of 1~6, while 1-H+ (?F=0.359) has the highest fluorescence quantum yield of the protonated compounds 1-H+~6-H+, benefiting from the electron-withdrawing pentafluorophenyl group of 1 and 1-H+. Moreover, the electrochemical analysis and DFT calculations demonstated that the introduction of electron-withdrawing pentafluorophenyl unit in the 2/6-positon of azulene can significantly lower the energy levels of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). In comparison with the HOMO/LUMO energy levels of azulene, those of 1 and 4 shift downward with ΔEHOMO/ΔELUMO of -0.23/-0.18 and -0.20/-0.15 eV, respectively. The investigations of physical/chemical properties of 2/6-aryl substituted azulene derivatives will provide valuable insights for developing azulene-based organic functional molecules.

Key words: azulene, aryl substitution, proton response