Edge-to-Center Propagation of Photochemical Reaction during Single-Crystal-to-Single-Crystal Photomechanical Transformation of 2,5-Distyrylpyrazine Crystals
Edge-to-Center Propagation of Photochemical Reaction during Single-Crystal-to-Single-Crystal Photomechanical Transformation of 2,5-Distyrylpyrazine Crystals
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2,5-二苯乙烯基吡嗪晶体单晶到单晶光机械转变过程中光化学反应的边缘到中心传播
DOI：
10.1002/anie.202212290
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Seiya Kobatake
中科院分区：
文献类型：
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作者：
Kohei Morimoto;Daichi Kitagawa;Hikaru Sotome;Syoji Ito;Hiroshi Miyasaka;Seiya Kobatake
光机械分子晶体是光子驱动人工致动器的理想材料。为了解释光机械响应，除了分子结构、分子堆积、光照条件、晶体形态、晶体尺寸等之外，晶体中光产物的时空分布可能是一个重要的角色。在这项研究中，我们发现2，5-二苯乙烯基吡嗪单晶显示出平滑的单晶到单晶的光机械膨胀，并且光化学反应从单晶的边缘传播到中心。我们发现，表面效应（在晶体表面的特殊反应性）除了协同效应（反应是由相邻分子促进）是必不可少的光化学反应的边缘到中心的传播。研究结果为进一步研究光机械分子晶体中的光化学反应动力学奠定了基础。
Photomechanical molecular crystals are promising materials for photon‐powered artificial actuators. To interpret the photomechanical responses, the spatiotemporal distribution of photoproducts in crystals could be an important role in addition to molecular structures, molecular packings, illumination conditions, crystal morphology, crystal size, and so on. In this study, we have found that single crystals of 2,5‐distyrylpyrazine show a smooth single‐crystal‐to‐single‐crystal photomechanical expansion, and the photochemical reaction propagates from the edge to the center of the single crystal. We revealed that the surface effect (special reactivity at the crystal surface) in addition to the cooperative effect (the reaction is facilitated by neighboring molecules) is essential for the edge‐to‐center propagation of the photochemical reaction. Our results would provide a foundation for future studies of the photochemical reaction dynamics in photomechanical molecular crystals.