论文标题：Light-regulated crystal growth of π-conjugated luminophoresin an azobenzene matrix

期刊：

作者：Takuji Kobayashi, Yuichi Kitamoto, Yu Hirai, Takashi Kajitani, Tomohiro Seki, Shiki Yagai

发表时间：2018/09/26

数字识别码： s42004-018-0061-8

原文链接：

控制功能分子的相变是设计刺激响应材料的关键。虽然许多研究致力于通过温度、溶剂蒸汽和机械刺激等各种刺激来控制功能分子的相变，但有关利用其他刺激反应分子进行间接控制的研究还很少。

近日，在《通讯-明升手机》发表的一篇文章Light-regulated crystal growth of π-conjugated luminophores in an azobenzene matrix中，来自日本千叶大学的Shiki Yagai及其团队通过使用发光和光响应分子展示了该方法的可行性。作者制备了由一种寡聚(对苯撑乙烯)两亲分子和一种光液化偶氮苯两亲分子组成的混合膜，其中寡聚(对苯撑乙烯)两亲分子通过各向同性到晶体的相变表现出固有的发光色度。通过引入相同的烷基链和低聚乙二醇链，两种材料能在分子水平上共同组装。混合膜在摩擦和随后的紫外线照射下呈现出从橙色到绿色的发光颜色变化。结构分析表明，发光两性分子的结晶是由偶氮苯两性分子的光诱导各向同性化所调控。

图1：紫外线引起的发光颜色变化

摘要：Control over the phase transition of functional molecules is a key to design stimuli-responsive materials.Although many efforts have been devoted toward controlling the phase transition of functional molecules by various stimuli such as temperature, solvent vapor, and mechanical stimuli, indirect control using other stimuli-responsive molecules has been hardly explored.Here we demonstrate the potential of this methodology by using a luminescent and a photoresponsive molecule.We prepare blend films composed of an oligo(p-phenylenevinylene)amphiphile showing intrinsic luminescent chromism through isotropic-to-crystalline phase transitionand a photo-liquefiable azobenzeneamphiphile.The two materials are designed to co-assemble on the molecular level by introducing identical alkyl and oligo(ethylene glycol) chains. The blend films exhibit a luminescence color change from orange to green upon rubbing and subsequent exposure to UV light.Structural analyses reveal that the crystallization of the luminescent amphiphile is regulated by the photoinducedisotropizationof the azobenzeneamphiphile.

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（来源：明升手机版(明升中国)）