Light‐Induced Bending of Needle‐Like Crystals of Naphthylvinylbenzoxazole Triggered by trans–cis Isomerization,Chemistry - An Asian Journal

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Light‐Induced Bending of Needle‐Like Crystals of Naphthylvinylbenzoxazole Triggered by trans–cis Isomerization
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2018-06-06 , DOI: 10.1002/asia.201800380
Jiang Peng ₁ , Jinyu Zhao ₁ , Kaiqi Ye ₁ , Hongqiang Gao ₁ , Jingbo Sun ₁ , Ran Lu ₁

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New diarylethene derivatives containing benzoxazole (NBO) and benzothiazole (NBT) have been synthesized. Light‐induced trans–cis isomerization of NBO and NBT took place in crystals, and only induced the needle‐like crystals of NBO to bend backwards away from the UV light source. The movement of the atoms was deemed to take place during the isomerization of NBO; hence, strain would be produced and accumulated rapidly in the surface of crystals exposed to UV light. The uniform release of strain led to the bending of needle‐like crystals. The light‐induced trans–cis isomerization efficiency of NBT was too low to drive the motion of crystals, which might have originated from the large repulsion between naphthyl and benzothiazole. These results provide a new platform for the transformation of light energy into mechanical energy in molecular crystals through the unimolecular photochemical reaction of diarylethene derivatives.

中文翻译：

反式-顺式异构化引发的萘基乙烯基苯并恶唑类针状晶体的光诱导弯曲

合成了含有苯并恶唑（NBO）和苯并噻唑（NBT）的新的二芳基乙烯衍生物。NBO和NBT的光诱导反式-顺式异构化发生在晶体中，并且仅诱导NBO的针状晶体向后弯曲，远离紫外光源。原子的运动被认为是在NBO的异构化过程中发生的; 因此，应变将在暴露于紫外线的晶体表面迅速产生并积累。应变的均匀释放导致针状晶体弯曲。光致反式-顺NBT的异构化效率太低，无法驱动晶体的运动，这可能是由于萘基与苯并噻唑之间的排斥力较大而引起的。这些结果为通过二芳基乙烯衍生物的单分子光化学反应将光能转化为分子晶体中的机械能提供了新的平台。

更新日期：2018-06-06

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