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Donor–Acceptor Conjugated Polymer Dots for Tunable Electrochemiluminescence Activated by Aggregation-Induced Emission-Active Moieties
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-08-29 00:00:00 , DOI: 10.1021/acs.jpclett.8b02087
Ziyu Wang 1 , Yaqiang Feng 2 , Ningning Wang 2 , Yixiang Cheng 1 , Yiwu Quan 1 , Huangxian Ju 2
Affiliation  

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 the P-2 Pdots 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.

中文翻译:

供体-受体共轭聚合物点的可调谐电化学发光由聚集诱导的发射活性部分激活。

具有出色ECL行为的低电势化学发光(ECL)发光体在生物学分析中引起了相当大的兴趣。在本文中,我们描述了通过Suzuki偶联聚合反应用供体-受体(DA)系统合成两种聚集诱导发射(AIE)-活性共轭聚合物的方法。分子内D–A对增强了它们在聚集态下的发光强度,这有利于制备作为ECL材料的共轭聚合物点(Pdots)。P-2 Pdots的ECL发射显示出芴部分(P-1之后)从578 nm到598 nm有明显的红移)被更强的给电子咔唑部分取代。ECL特性可以通过D–A部分的分子内电荷转移来调节,这导致ECL阳极电位急剧下降(553 mV)。此外,由于最低的未占据分子轨道水平低,ECL强度显着提高了约6倍,这有利于电子注入到共轭聚合物主链中。这项工作为通过调节D–A电子结构开发具有低电势和高ECL发射强度的AIE活性ECL材料提供了有效的策略。
更新日期:2018-08-29
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