Acta Chim. Sinica ›› 2016, Vol. 74 ›› Issue (8): 669-675.DOI: 10.6023/A16040162 Previous Articles     Next Articles



陈鹏a,b, 王宇洋a, 张宇模a, 张晓安a   

  1. a 吉林大学化学学院超分子结构与材料国家重点实验室 长春 130012;
    b 吉林大学化学学院无机合成与制备化学国家重点实验室 长春 130012
  • 投稿日期:2016-04-01 发布日期:2016-06-07
  • 通讯作者: 张晓安
  • 基金资助:

    项目受国家自然科学基金(Nos. 21302061,51373068)、高等学校博士学科点专项科研基金(No. 20130061120016)、中国博士后科学基金(Nos. 2013T60318,2012M510130)和吉林省科技发展计划项目(No. 20140520084JH)资助.

Design, Synthesis and Property Study of Bispiropyran Switchable Molecule Based on Acridone

Chen Penga,b, Wang Yuyanga, Zhang Yu-Moa, Zhang Sean Xiao-Ana   

  1. a State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012;
    b State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012
  • Received:2016-04-01 Published:2016-06-07
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 21302061, 51373068), Specialized Research Fund for the Doctoral Program of Higher Education (No. 20130061120016), China Postdoctoral Science Foundation (Nos. 2013T60318, 2012M510130) and Jilin Province Science & Technology Development Program (No. 20140520084JH).

We designed a bispiropyran switchable molecule based on acridone. Using commercially available 3-bromoanisole and 2-amino-4-methoxybenzoic acid as starting materials, through a six-step synthetic route containing Ullmann biaryl amine condensation, Friedel-Crafts acylation, alkylation of the amine group in the resulting acridone core, regioselective double formylation at the ortho-position to the methoxy groups, demethylation of the two methoxy groups, double condensation with 1,2,3,3-tetramethyl-3H-indolium iodide, the target bispiropyran switchable molecule was successfully synthesized. The UV/Vis spectra and fluorescence spectra of the target dual-switch molecule were studied. It was demonstrated that the bispiropyran molecule had obvious reversible photochromic behavior in dichloromethane solution. For more detail, the spiropyran unit of the designed molecule could be changed to the open-ring form upon UV light irradiation, and the open-ring form of the molecule could be changed to its closed-ring form again when it was placed in the dark. The molecule showed a high stability to acid in MeOH and CH2Cl2, and it had a slow acidichromic behaviour in MeCN. In addition, the molecule showed an acidichromic behaviour in MeCN/H2O solution only when the pH was below 4. However, in the above chromic process, through the UV/Vis spectra we have not found the two states containing single-ring-opened form followed by dual-ring-opened form of the designed molecule. Further study was performed through the computer simulation, and the optimal structures for the dual-ring-closed form (SP-Ac-SP), single-ring-opened form (SP-Ac-MC) and dual-ring-opened form (MC-Ac-MC) of the target molecule in the photochromic process were calculated using B3LYP/6-31g(d) in vacuum. It was found that the SP-Ac-SP was more easily directly transformed to MC-Ac-MC, because the Gibbs free energy change (ΔG1=7.2 kcal/mol) from SP-Ac-SP to SP-Ac-MC was much higher than that (ΔG2=3.5 kcal/mol) from SP-Ac-MC to MC-Ac-MC. The relevant frontier molecular orbitals for the SP-Ac-SP and MC-Ac-MC of the designed molecule calculated using B3LYP/6-31g(d) in vacuum could further explain the detail of the chromic process. Our study will give inspiration to design new type of dual-switch molecules based on conjugate structure.

Key words: spiropyran, acridone, dual-switch molecule, photochromism, acidichromism