Donor–Acceptor Conjugated Polymer Dots for Tunable Electrochemiluminescence Activated by Aggregation-Induced Emission-Active Moieties
Donor–Acceptor Conjugated Polymer Dots for Tunable Electrochemiluminescence Activated by Aggregation-Induced Emission-Active Moieties
复制标题
供体-受体共轭聚合物点，用于由聚集诱导的发射活性部分激活的可调谐电化学发光
DOI：
10.1021/acs.jpclett.8b02087
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Huangxian Ju
中科院分区：
文献类型：
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作者：
Ziyu Wang;Yaqiang Fang;Ningning Wang;Yixiang Cheng;Yiwu Quan;Huangxian Ju
低电位电致化学发光(ECL)发光材料具有良好的电致化学发光行为，在生物分析中引起了人们的极大兴趣。在这里，我们描述了通过Suzuki偶联聚合反应合成了两种具有聚集诱导发射(AIE)活性的共轭聚合物，该聚合物具有供体-受体(D-A)体系。分子内的D-A对增强了聚集态的发光强度，有利于制备共轭聚合物点(Pdots)作为ECL材料。用更强的给电子咔唑取代荧烯部分(P-1)后，Thep-2Pdots的ECL发射从578 nm明显红移到598 nm。电化学发光的性质可以通过D-A部分的分子内电荷转移来调节，从而导致电化学发光的阳极电位急剧下降(553 MV)。此外，由于低的最低未占据分子轨道能级，ECL强度显著提高了约6倍，这有利于电子注入共轭聚合物主链。这项工作为通过调整D-A电子结构开发低电势、高发射强度的AIE活性ECL材料提供了一种有效的策略。
Low-potential electrochemiluminescence (ECL) luminophores with excellent ECL behavior have attracted considerable interest in biological analysis. Herein, we describe the synthesis of two aggregation-induced emission (AIE)-active conjugated polymers with a donor–acceptor (D–A) system via a Suzuki coupling polymerization reaction. The intramolecular D–A pairs enhanced their luminescence intensity in aggregate states, which was beneficial for preparation of conjugated polymer dots (Pdots) as ECL materials. The ECL emission of theP-2Pdots showed obvious red shift from 578 to 598 nm after the fluorene moiety (P-1) was replaced with a stronger electron-donating carbazole moiety. The ECL property could be regulated with intramolecular charge transfer of the D–A moieties, which led to a sharp decline (553 mV) of ECL anodic potential. Furthermore, the ECL intensity significantly increased about 6 times because of the low lowest unoccupied molecular orbital level, which facilitated the electron injection into the conjugated polymer backbone. This work provides an effective strategy for developing AIE-active ECL materials with low potential and high ECL emission intensity via adjusting the D–A electronic structure.