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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Azobenzene crystal polymorphism enables tunable photoinduced deformations, mechanical behaviors and photoluminescence properties
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Azobenzene crystal polymorphism enables tunable photoinduced deformations, mechanical behaviors and photoluminescence properties

机译：偶氮苯晶多态性使可调谐光导体变形，机械行为和光致发光性能

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摘要

Stimuli-responsive molecular crystals are fascinating for their potential as adaptive smart materials. However, achieving crystals that could respond to multiple stimuli and perform multiple functionalities simultaneously is still a challenging task. Herein, we report the fabrication and preparation of polymorphic crystals with multiple stimuli of a photoactive azobenzene derivative, trans-4-cyano-4 '-oxethyl azobenzene (AzC(2)). Different polymorphic forms of AzC(2) exhibit remarkable different photoinduced deformations, mechanical behaviors and photoluminescence properties. Upon UV irradiation, although both polymorphic forms undergo reversible photomechanical bending motions, Form I bent away from the light source while Form II bent towards the light source. Upon exertion of external mechanical stress, Form I tended to break whereas Form II exhibited elastic deformation. Furthermore, being excited at 325 nm, the block crystal of Form I exhibited a relatively strong green-yellow emission while a very weak red fluorescence emission was observed from the thicker Form II crystal. These different properties can be attributed to different molecular packings rather than molecular conformations. The present work provides an effective strategy to construct multiple stimuli-responsive crystal materials with potential applications in actuators, switches and sensors.
机译：刺激响应分子晶体因其作为适应性智能材料的潜力而备受关注。然而，实现能够对多种刺激做出反应并同时执行多种功能的晶体仍然是一项具有挑战性的任务。在此，我们报道了一种光活性偶氮苯衍生物反式-4-氰基-4'-氧乙基偶氮苯（AzC（2））的多晶型晶体的制备。不同晶型的AzC（2）表现出显著不同的光致变形、力学行为和光致发光性质。在紫外光照射下，尽管两种多晶型都经历了可逆的光机械弯曲运动，但形式I弯曲远离光源，而形式II弯曲朝向光源。在施加外部机械应力时，形式I倾向于断裂，而形式II表现出弹性变形。此外，在325nm激发下，形式I的嵌段晶体表现出相对较强的绿黄色发射，而从较厚的形式II晶体中观察到非常微弱的红色荧光发射。这些不同的性质可以归因于不同的分子填料，而不是分子构象。本研究为构建多刺激响应晶体材料提供了一种有效的策略，在驱动器、开关和传感器中具有潜在的应用前景。

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    Hao Yunhui; Gao Lei; Zhang Xiunan; Wei Rongli; Wang Ting; Wang Na; Huang Xin; Yu Haifeng; Hao Hongxun;

  • 作者单位

    Tianjin Univ Sch Chem Engn &

    Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China;

    Peking Univ Sch Mat Sci &

    Engn Beijing 100871 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol State Key Lab Chem Engn Tianjin 300072 Peoples R China;

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  • 正文语种 eng
  • 中图分类 物理化学（理论化学）、化学物理学;
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