Supramolecular Fluorescent Polymers Containing alpha-Cyanostilbene-Based Stereoisomers: Z/E-Isomerization Induced Multiple Reversible Switching
Supramolecular Fluorescent Polymers Containing alpha-Cyanostilbene-Based Stereoisomers: Z/E-Isomerization Induced Multiple Reversible Switching
复制标题
含有 α-氰基芪立体异构体的超分子荧光聚合物：Z/E 异构化诱导的多重可逆转换
DOI：
10.1021/acs.macromol.8b00347
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发表时间：
2018
期刊：
影响因子：
5.5
通讯作者：
Chen Xiao-Fang
中科院分区：
文献类型：
--
作者：
Zhu Yalan;Zheng Meiqing;Tu Yuanyang;Chen Xiao-Fang
光响应材料在智能传感器和可读光学器件中起着重要作用。α-氰基二苯乙烯部分将Z/E-异构化、介晶和聚集诱导增强发射（AIEE）性质结合在一起，并且可以被认为是具有发光体、AIEgen、介晶和发色团特性的多功能构建块。本文报道了α-氰基二苯乙烯衍生物的Z-和E-立体异构体（Z-CNBP和E-CNBP）与聚4-乙烯基吡啶（P4 VP）通过氢键作用，分别生成P4 VP（Z-CNBP）x和P4 VP（E-CNBP）x，并在此基础上研究了它们的异构化反应。P4 VP（Z-CNBP）x在0.4 ≤x≤ 1.0时为六方柱状（Φh）相，而P4 VP（E-CNBP）x在0.3 ≤x≤ 0.7时可形成片层相。P4 VP（Z-CNBP）0.8显示了光热E/Z异构化诱导的可逆转换，包括相结构、表面形貌、双折射和荧光性质，而P4 VP（E-CNBP）0.5在紫外光照射下表现出增强的荧光发射。
Photoresponsive materials play an important role in smart sensors and readable optical devices. The α-cyanostilbene moiety gathersZ/E-isomerization, mesogenic, and aggregation-induced enhanced emission (AIEE) properties together and can be considered as a multifunctional building block bearing luminogen, AIEgen, mesogen, and chromphore characteristics. Here, we report isomerization induced a series of notable reversible switching based on α-cyanostilbene containing hydrogen-bonded supramolecular polymers.Z- andE-stereoisomers of dendritic α-cyanostilbene derivatives (Z-CNBP andE-CNBP) were hydrogen-bonded with poly(4-vinylpyridine) (P4VP), giving rise to P4VP(Z-CNBP)xand P4VP(E-CNBP)x. P4VP(Z-CNBP)xexhibit a hexagonal columnar (Φh) phase at 0.4 ≤x≤ 1.0, while the lamellar phase could be formed for P4VP(E-CNBP)xat 0.3 ≤x≤ 0.7. P4VP(Z-CNBP)0.8shows photothermalE/Z-isomerization induced reversible switching, including phase structures, surface topographies, birefringence, and fluorescence properties, whereas P4VP(E-CNBP)0.5exhibits enhanced fluorescence emission upon UV irradiation.