Donor-Acceptor Conjugated Polymer Dots for Tunable Electrochemiluminescence Activated by Aggregation-Induced Emission-Active Moieties

The Journal of Physical Chemistry Letters
Ziyu WangHuangxian Ju

Abstract

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.

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Citations

May 14, 2019·Physical Chemistry Chemical Physics : PCCP·Zhaofan YangXiaoquan Lu
Jul 10, 2019·Chemistry : a European Journal·Xing WeiJing-Juan Xu
Feb 27, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Yejin ZhuXiaotang Wang
Dec 6, 2019·Frontiers in Chemistry·Jiemin JiaoXuenian Chen
Jan 14, 2021·Polymers·Antonio Sánchez-RuizJoaquín C Garcia-Martinez
Jun 10, 2021·ACS Applied Materials & Interfaces·Lin CuiChun-Yang Zhang
Jun 21, 2021·Topics in Current Chemistry·Guillermo Moreno-AlcántarLuisa De Cola
Nov 5, 2019·Analytical Chemistry·Cheng MaJun-Jie Zhu
Jan 28, 2020·ACS Applied Materials & Interfaces·Lin CuiChun-Yang Zhang

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