α,β-Diarylacrylonitrile derivatives can be prepared by two different routes: (1) the intermolecular condensation of the same arylacetonitriles (2) the condensation of arylaldehydes and arylacetonitriles with a catalytic amount of NaOCH3 at room temperature. Several α,β-diarylacrylonitrile derivatives have been synthesised in this paper and characterised. The UV-vis absorption and photoluminescent (PL)
Fast photoactuation of elastic crystals based on 3-(naphthalen-1-yl)-2-phenylacrylonitriles triggered by subtle photoisomerization
作者:Cheng Liu、Kaiqi Ye、Zhonglin Wei、Jiang Peng、Huan Xiao、Jingbo Sun、Ran Lu
DOI:10.1039/d2tc02667h
日期:——
molecular width after the photochemical reaction and strong intermolecular interactions to amplify the deformation at the molecular level into the macroscopic mechanical motion of the crystals. Therefore, the crystals performed reversible photo-induced bending and unbending by turning around the irradiation directions more than 100 times on account of the retained crystal integrity during photoactuation and
通过Knoevenagel缩合反应合成了一系列( Z )-3-(naphthalen-1-yl)-2-苯基丙烯腈衍生物。光异构化发生在分子晶体中,这会触发晶体从光源迅速向后弯曲。特别是,在紫外线照射的最初几秒钟内观察到显着的光机械运动,在此期间,从Z - 到E - 异构体的转化率小于ca。0.4%。这种由微妙的光异构化引起的快速光致动可能源于光化学反应后分子宽度的较大变化和强烈的分子间相互作用,从而将分子水平的变形放大为晶体的宏观机械运动。因此,由于在光致动过程中保持了晶体的完整性和晶体的良好弹性,晶体通过将照射方向翻转 100 次以上进行了可逆的光致弯曲和伸直。针状晶体在水中也表现出光机械效应。这种光化学反应驱动的光机械分子晶体可以在许多实际应用场景中用作致动器。