非典型发光化合物的簇聚诱导发光
Clustering-Triggered Emission of Nonconventional Luminophores
不含大共轭结构的非典型发光化合物因其理论研究的重要性和潜在应用前景引起研究者的广泛关注。非典型发光化合物的结构通常含有N、O、S、P等杂原子,C≡N、C=O、C=C等不饱和单元,及相应的组合功能团(如羟基、胺基、酯基、酐、酰胺、脲基、肟基、砜基等)。近年来,尽管这一领域正快速发展,其发光机理仍存争议。前期,我们提出了簇聚诱导发光(CTE)机理,即含π电子和/或孤对(n)电子的非典型生色团的簇聚及其带来的空间共轭使体系离域扩展,构象刚硬化;同时,其他分子内/间相互作用也有利于簇生色团的刚硬化,从而易于受激发射。基于CTE机理,本文综述了非典型发光化合物的发光特性,包括浓度增强发光、聚集诱导发光(AIE)、激发波长依赖性及磷光发射。CTE机理可合理解释天然产物、合成化合物、生物分子等不同体系的光物理行为,并可用来指导发现和设计新的非典型发光化合物。本文总结了上述不同体系的发展,并对未来研究进行了展望。
Intrinsic emission from nonconventional luminophores without classic remarkable conjugation has aroused increasing attention due to its significant fundamental importance and promising applications. These nonconventional luminophores generally contain the heteroatoms(i.e. N, O, S, P), unsaturated units of C≡N, C=O, C=C, etc., and their grouped moieties(i.e. hydroxyl, amino, ester, anhydride, amide, uramido, oxime, sulfone). In recent years, despite great progress has been achieved, the emission mechanism still remains under debate. Previously, we proposed the clustering-triggered emission(CTE) mechanism, namely the clustering of nonconventional chromophores with π and n electrons and subsequent through space conjugation result in extended electron delocalization and conformation rigidification, to rationalize the emission. Herein, based on the CTE mechanism, we review such typical emission characteristics of nonconventional luminophores as concentration enhanced emission, aggregation-induced emission(AIE), excitation-dependent emission, and phosphorescence. It is also noted that CTE mechanism can be used to rationalize the photophysical behaviors of different types of nonconventional luminophores of natural products, synthetic compounds, and biomolecules. Furthermore, it is also helpful to guide the rational discovery or design of new nonconventional luminogens. In addition, we briefly summarize the progress of different kinds of nonconventional luminophores. Finally, the perspectives of this emerging area are also discussed.
非典型发光化合物 / 簇聚诱导发光 / 磷光 / 空间共轭 / 构象刚硬化
nonconventional luminophores / clustering-triggered emission / phosphorescence / through space conjugation / conformation rigidification
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国家自然科学基金项目(51822303)
中国博士后创新人才支持计划(BX20190112)
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