共軛發光體在偶氮苯基體中的光控晶體生長

論文標題：Light-regulated crystal growth of π-conjugated luminophoresin an azobenzene matrix

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

數字識別碼： s42004-018-0061-8

控制功能分子的相變是設計刺激響應材料的關鍵。雖然許多研究致力於通過溫度、溶劑蒸汽和機械刺激等各種刺激來控制功能分子的相變，但有關利用其他刺激反應分子進行間接控制的研究還很少。

近日，在《通訊-化學》發表的一篇文章Light-regulated crystal growth of π-conjugated luminophores in an azobenzene matrix中，來自日本千葉大學的Shiki Yagai及其團隊通過使用發光和光響應分子展示了該方法的可行性。作者製備了由一種寡聚(對苯撐乙烯)兩親分子和一種光液化偶氮苯兩親分子組成的混合膜，其中寡聚(對苯撐乙烯)兩親分子通過各向同性到晶體的相變表現出固有的發光色度。通過引入相同的烷基鏈和低聚乙二醇鏈，兩種材料能在分子水平上共同組裝。混合膜在摩擦和隨後的紫外線照射下呈現出從橙色到綠色的發光顏色變化。結構分析表明，發光兩性分子的結晶是由偶氮苯兩性分子的光誘導各向同性化所調控。

圖1：紫外線引起的發光顏色變化

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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期刊介紹：Communications Chemistry(https://www.nature.com/commschem/) is an open access journal from Nature Research publishing high-quality research, reviews and commentary in all areas of the chemical sciences. Research papers published by the journal represent significant advances bringing new chemical insight to a

（來源：Communications Chemistry）

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