具有红色发射的聚炔桥连聚集诱导发光材料：设计、合成、性质及应用
Polyyne bridged AIE luminogens with red emission: design, synthesis, properties and applications.
作者信息
Zhao Zheng, Su Huifang, Zhang Pengfei, Cai Yuanjing, Kwok Ryan T K, Chen Yuncong, He Zikai, Gu Xinggui, He Xuewen, Sung Herman H Y, Willimas Ian D, Lam Jacky W Y, Zhang Zhenfeng, Tang Ben Zhong
机构信息
Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute of Molecular Functional Materials, Institute for Advanced Study, State Key Laboratory of neuroscience, Division of Biomedical Engineering, and Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
出版信息
J Mater Chem B. 2017 Feb 28;5(8):1650-1657. doi: 10.1039/c7tb00112f. Epub 2017 Feb 8.
Construction of a donor-acceptor (D-A) structure and extension of π-conjugation are the commonly used strategies to shift the emission of luminophores to the red region. However, molecules with high conjugation and a strong D-A effect tend to show weak emission due to the severe π-π interactions and twisted intramolecular charge transfer (TICT) effects. The turn-on characteristic of AIE luminogens (AIEgens) will also be lost due to the conjugation-enhanced emission in the solution state. Herein, a polyyne-bridged AIE luminogen (2TPE-4E) with long wavelength absorption and red emission has been afforded. Despite its large π-conjugation, 2TPE-4E suffers from no emission quenching resulted from strong π-π interactions and twisted intramolecular charge transfer effects. The strong red emission and the high photostability of 2TPE-4E inspired us to use it for targeted-imaging of cancer cells and monitoring the receptor mediated endocytosis process.
构建供体-受体（D-A）结构以及扩展π共轭是将发光体发射光谱移至红色区域的常用策略。然而，具有高共轭和强D-A效应的分子由于严重的π-π相互作用和扭曲的分子内电荷转移（TICT）效应，往往表现出较弱的发射。由于溶液状态下共轭增强发射，聚集诱导发光分子（AIEgens）的开启特性也会丧失。在此，我们制备了一种具有长波长吸收和红色发射的聚炔桥连AIE发光分子（2TPE-4E）。尽管2TPE-4E具有较大的π共轭，但并未因强π-π相互作用和扭曲的分子内电荷转移效应而导致发射猝灭。2TPE-4E强烈的红色发射和高光稳定性促使我们将其用于癌细胞的靶向成像以及监测受体介导的内吞过程。
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