Handbook of Aggregation-Induced Emission, Volume 2. Группа авторов

Handbook of Aggregation-Induced Emission, Volume 2 - Группа авторов


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       3.3.2 Nanoparticles

Schematic illustration of (a) the chemical structures of 73, 74, and the reaction mechanism of photoactivatable fluorescence property of 75.

      Source: Reprinted from Ref. [77] (Copyright 2016 American Chemical Society).

Image described by caption.

      Source: Reprinted from Ref. [57] (Copyright 2018 John Wiley and Sons).

      In summary, as a typical class of AIEgens, SSB has been widely designed as fluorescent probes as well as materials. Thanks to the ESIPT characteristics, SSB fluorophores have large Stokes shift without self‐absorption, thus avoiding the interference from excitation light and performing satisfactory resistance to photobleaching. The spatial position of the oxygen atom on the hydroxyl group and the nitrogen atom on the imine in the specific molecular structure of SSB analogues allows it to strongly coordinate with metal ions such as copper(II) and zinc(II). Such a unique molecular structure endows SSB as an ideal candidate for designing metal ion fluorescent probes with high sensitivity and selectivity. Meanwhile, using the coordination properties of SSB with metal ions, SSB–metal complexes are utilized as nonmetal ion probes or stimuli‐responsive materials. Through the protection and deprotection of hydroxyl groups, SSB derivatives are modified with various recognition groups for the design of fluorescent bioprobes and functional materials. In addition, the hypsochromic shift of most SSB analogues after deprotonation attributes to their ratiometric fluorescence, which significantly reduces background interference during real sample detection. The luminescent advantage and ease of derivatization afforded by the unique molecular structure of SSB allow its widespread application in high‐resolution metal ion detection, environmental and biosensing, as well as functionalized optical materials.


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