MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering , Zhejiang University , Hangzhou 310027 , China.
Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration and Reconstruction , The Hong Kong University of Science & Technology , Clear Water Bay , Kowloon , Hong Kong , China.
ACS Appl Mater Interfaces. 2018 Apr 18;10(15):12181-12188. doi: 10.1021/acsami.8b03178. Epub 2018 Mar 7.
Polymers with aggregation-induced emission (AIE) characteristics have aroused tremendous interest because of their potential applications in large-area flexible display and luminescent self-assembling, and as stimuli-responsive and porous materials. However, the design of AIE-active polymers is always not as easy as that of small molecules because their properties are hard to predict. In some cases, the polymers prepared from the AIE-active monomers show the aggregation-caused quenching (ACQ) instead of AIE effect. To understand the structure-property relationship of the polymers constructed from the AIE monomers, in this paper, two pyrazine-containing AIE monomers were utilized to construct luminescent polymers by click polymerization. The photophysical property investigation indicates that the polytriazole containing tetraphenylpyrazine units is AIE-active, whereas that bearing 2,3-dicyano-5,6-diphenylpyrazine units suffers from the ACQ effect. Through systematical investigation, the cause for such difference was unveiled. Thus, this work provides a useful guidance for further design of AIE-active polymers.
具有聚集诱导发光（AIE）特性的聚合物因其在大面积柔性显示和发光自组装、作为刺激响应和多孔材料的潜在应用而引起了极大的兴趣。然而，AIE 活性聚合物的设计并不像小分子那样容易，因为它们的性质难以预测。在某些情况下，由 AIE 活性单体制备的聚合物表现出聚集诱导猝灭（ACQ）而不是 AIE 效应。为了理解由 AIE 单体构建的聚合物的结构-性质关系，本文利用两个含吡嗪的 AIE 单体通过点击聚合构建了发光聚合物。光物理性质研究表明，含有四苯基吡嗪单元的聚三唑是 AIE 活性的，而含有 2,3-二氰基-5,6-二苯基吡嗪单元的聚合物则具有 ACQ 效应。通过系统的研究，揭示了这种差异的原因。因此，这项工作为进一步设计 AIE 活性聚合物提供了有用的指导。
