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    沈海欣, 李萌祺, 朱为宏. 氢键对位阻型二芳基乙烯有机凝胶性能影响[J]. 华东理工大学学报(自然科学版), 2023, 49(1): 1-11. DOI: 10.14135/j.cnki.1006-3080.20220426001
    引用本文: 沈海欣, 李萌祺, 朱为宏. 氢键对位阻型二芳基乙烯有机凝胶性能影响[J]. 华东理工大学学报(自然科学版), 2023, 49(1): 1-11. DOI: 10.14135/j.cnki.1006-3080.20220426001
    SHEN Haixin, LI Mengqi, ZHU Weihong. Effect of Hydrogen Bond on the Performance of Organic Gel Based on Sterically-Hindered Diarylethenes[J]. Journal of East China University of Science and Technology, 2023, 49(1): 1-11. DOI: 10.14135/j.cnki.1006-3080.20220426001
    Citation: SHEN Haixin, LI Mengqi, ZHU Weihong. Effect of Hydrogen Bond on the Performance of Organic Gel Based on Sterically-Hindered Diarylethenes[J]. Journal of East China University of Science and Technology, 2023, 49(1): 1-11. DOI: 10.14135/j.cnki.1006-3080.20220426001

    氢键对位阻型二芳基乙烯有机凝胶性能影响

    Effect of Hydrogen Bond on the Performance of Organic Gel Based on Sterically-Hindered Diarylethenes

    • 摘要: 基于位阻型二芳基乙烯,合成了两种光响应有机凝胶分子ap-BAM和ap-YJ,其荧光性能和凝胶性能可通过光照进行有效可逆调控,并且两种分子在溶液中均具有优异的光响应性能。目标分子ap-BAM可通过氢键结合单元在常温下形成凝胶,而参比分子ap-YJ只能在低温下形成凝胶。研究表明两种凝胶分子均具有聚集诱导发光性能,在凝胶开环态均表现出较强的荧光性能;当受到紫外光照射后,则由凝胶态转化为溶液态,并发生了荧光淬灭。扫描电子显微镜测试结果表明,ap-BAM凝胶形成了致密的三维多孔网络,而ap-YJ凝胶仅形成了致密薄膜,表明具有氢键结构单元的ap-BAM凝胶具有更好的凝胶性能。

       

      Abstract: Photo-responsive organic functional gels have drawn the increasing attention due to their functional diversity. Based on sterically-hindered diarylethenes, we synthesized two photoresponsive organic gels, ap-BAM and ap-YJ , which exhibited reversible fluorescence and gelation properties upon light irradiation. Both organic gel materials show high conversion ratio and fatigue resistance in the solution state. Meanwhile, ap-BAM with hydrogen-bonding network can convert into the gel state at room temperature, and the reference system of ap-YJ can only convert into gels at a low temperature (−10 ℃). In addition, due to the aggregation-induced emission (AIE) property of the sterically hindered diarylethene core, the open form of the gel exhibits a relatively strong fluorescence. Upon irradiated by UV light, two photoresponsive gels transfer from gel to solution state along with a quenched fluorescence. This can be attributed to an increase in the rigidity of the closed form and a steric hindrance of the methyl groups, which diminishes intermolecular interactions. The morphology of the gels is characterized by scanning electron microscopy (SEM). A denser gelatin with three-dimensional porous network can be found in ap-BAM system. However, ap-YJ forms just a dense film, indicating that the hydrogen-bonding network in the ap-BAM gel system facilitates the gelation.

       

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