Solvent Control over Supramolecular Gel Formation and Fluorescence for a Highly Crystalline π‐Conjugated Polymer,Chemistry - An Asian Journal

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Solvent Control over Supramolecular Gel Formation and Fluorescence for a Highly Crystalline π‐Conjugated Polymer
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2018-07-26 , DOI: 10.1002/asia.201800941
Shotaro Hayashi ₁ , Atsushi Takigami ₁ , Toshio Koizumi ₁

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In π‐conjugated polymers (πCPs), crystallinity and fluorescence typically exhibit a trade‐off relationship. Here, we have synthesized a highly crystalline and fluorescent π‐conjugated polymer with a simple alternating structure of 1,2,4,5‐tetrafluorophenylene and 3,3′‐dihexyl‐2,2′‐bithiophene units. In film, the polymer exhibited efficient red‐colored fluorescence, an improved quantum yield (Φ_sol=13 %→Φ_film=23 %) and a crystalline structure. Interestingly, supramolecular gel formation occurred in appropriate solvents, and the macrostructure and fluorescence properties of the gel could be directly controlled by the choice of the solvent. The polymer self‐assembled into a spherical form that exhibited red fluorescence in non‐aromatic solvent (1,2‐dichloroethane) and into a fibrous form that exhibited yellow fluorescence in aromatic solvent (mesitylene).

中文翻译：

高结晶 π 共轭聚合物超分子凝胶形成和荧光的溶剂控制

在π共轭聚合物（πCP）中，结晶度和荧光通常表现出一种权衡关系。在这里，我们合成了一种高度结晶和荧光的 π 共轭聚合物，具有 1,2,4,5-四氟亚苯基和 3,3'-二己基-2,2'-联噻吩单元的简单交替结构。在薄膜中，聚合物表现出高效的红色荧光、改进的量子产率（Φ _sol =13 %→Φ _film = 23 %）和晶体结构。有趣的是，超分子凝胶的形成发生在适当的溶剂中，并且凝胶的宏观结构和荧光性质可以通过溶剂的选择直接控制。该聚合物自组装成球形，在非芳香族溶剂（1,2-二氯乙烷）中表现出红色荧光，并自组装成纤维状，在芳香族溶剂（均三甲苯）中表现出黄色荧光。

更新日期：2018-07-26

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