State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P.R. China.
Chem Asian J. 2018 Jul 4;13(13):1719-1724. doi: 10.1002/asia.201800380. Epub 2018 Jun 6.
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.
已经合成了含有苯并恶唑（NBO）和苯并噻唑（NBT）的新型二芳基乙烯衍生物。NBO 和 NBT 的光致顺反异构化在晶体中发生，并且仅诱导 NBO 的针状晶体向后弯曲远离紫外光源。原子的运动被认为发生在 NBO 的异构化过程中；因此，在暴露于紫外光的晶体表面会迅速产生并积累应变。应变的均匀释放导致针状晶体的弯曲。NBT 的光致顺反异构化效率太低，无法驱动晶体的运动，这可能源于萘基和苯并噻唑之间的巨大排斥力。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。
