Hyperbranching-Enhanced-Emission Effect Discovered in Hyperbranched Poly(4-(cyanomethyl)phenyl methacrylate),ACS Macro Letters

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Hyperbranching-Enhanced-Emission Effect Discovered in Hyperbranched Poly(4-(cyanomethyl)phenyl methacrylate)
ACS Macro Letters ( IF 5.1 ) Pub Date : 2019-11-22 , DOI: 10.1021/acsmacrolett.9b00864
Laiping Fang ₁ , Chushu Huang ₁ , Ghulam Shabir ₂ , Jinlun Liang ₁ , Zhaoyang Liu ₁ , Hefeng Zhang _{1,

3,

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Affiliation

To disclose the effect of architecture over fluorescence behaviors of polymers, linear and hyperbranched poly(4-(cyanomethyl)phenyl methacrylate)s (PCPMAs) were synthesized by using atom transfer radical polymerization (ATRP). Compared to linear PCPMAs with weakly AIE (AIE: aggregation-induced-emission) characteristics and small-molecule analogues of 4-(cyanomethyl)phenyl isobutyrate (CPB) with ACQ (ACQ: aggregation-caused-quenching) behaviors, hyperbranched PCPMA showed dramatically stronger fluorescence at both solution and solid states and more significant AIE characteristics, which were further enhanced by increasing the branching degree, indicating a significant hyperbranching-enhanced-emission effect (HEE). The HEE effect was attributed to the strong promotion of hyperbranched architecture over the formation of a nitrile group cluster with through-space conjugation (TSC). The HEE effect provided a promising methodology to construct efficient nontraditional fluorescent polymers without large-conjugated, rigid, and planar emitter groups.

中文翻译：

在超支化聚（4-（氰基甲基）苯基甲基丙烯酸酯）中发现的超支化增强发射效应

为了揭示结构对聚合物荧光行为的影响，通过使用原子转移自由基聚合 (ATRP) 合成了线性和超支化聚 (4-(氰基甲基)苯基甲基丙烯酸酯) (PCPMA)。与具有弱 AIE（AIE：聚集诱导发射）特性的线性 PCPMA 和具有 ACQ（ACQ：聚集引起的猝灭）行为的 4-(氰基甲基)苯基异丁酸酯 (CPB) 的小分子类似物相比，超支化 PCPMA 表现出显着在溶液和固态下都有更强的荧光和更显着的 AIE 特性，随着支化度的增加而进一步增强，表明存在显着的超支化增强发射效应 ( HEE )。熙_效应归因于超支化结构对形成具有空间共轭（TSC）的腈基团簇的强烈促进。HEE效应提供了一种很有前途的方法来构建没有大共轭、刚性和平面发射器基团的高效非传统荧光聚合物。

更新日期：2019-11-28

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