Journal ArticleDOI
Synthesis, Light Emission, Nanoaggregation, and Restricted Intramolecular Rotation of 1,1-Substituted 2,3,4,5-Tetraphenylsiloles
Junwu Chen,Charles Chi Wang Law,Jacky W. Y. Lam,Yuping Dong,Samuel M. F. Lo,Ian D. Williams,and Daoben Zhu,Ben Zhong Tang +7 more
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TLDR
A series of 10 2,3,4,5-tetraphenylsiloles with different 1,1-substituents [XYSi(CPh)4] were prepared, and three of them were characterized crystallographically as mentioned in this paper.Abstract:
A series of ten 2,3,4,5-tetraphenylsiloles with different 1,1-substituents [XYSi(CPh)4] were prepared, and three of these, i.e., 1,1,2,3,4,5-hexaphenylsilole [X = Y = Ph (3)], 1-ethynyl-1,2,3,4,5-pentaphenylsilole [X = Ph, Y = C⋮CH (15)], and 1,1-bis(phenylethynyl)-2,3,4,5-tetraphenylsilole [X = Y = C⋮CPh (18)], were characterized crystallographically. The ground- and excited-states of the siloles were influenced by the inductive effect of the 1,1-substituents: with an increase in their electronegativity, the absorption and emission spectra of the siloles bathochromically shifted. A simple and reliable TLC-based method was developed for measurement of the solid-state luminescence spectra of the siloles. When molecularly dissolved in common solvents at room temperature, all the siloles were practically nonemissive (“off”). When poor solvents were added, the silole molecules clustered into nanoaggregates, which turned the emission “on” and boosted the photoluminescence quantum yields by up to 2 orders of m...read more
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Aggregation-Induced Emission: Together We Shine, United We Soar!
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Aggregation-induced emission
TL;DR: In this critical review, recent progress in the area ofAIE research is summarized and typical examples of AIE systems are discussed, from which their structure-property relationships are derived.
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Aggregation-induced emission: phenomenon, mechanism and applications.
TL;DR: The restriction of intramolecular rotation is identified as a main cause for the AIE effect and a series of new fluorescent and phosphorescent AIE systems with emission colours covering the entire visible spectral region and luminescence quantum yields up to unity are developed.
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Aggregation-Induced Emission: The Whole Is More Brilliant than the Parts
TL;DR: “United the authors stand, United they fall”–Aesop.
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New sensing mechanisms for design of fluorescent chemosensors emerging in recent years
TL;DR: New fluorescent sensing mechanisms that have emerged in the past five years, such as aggregation-induced emission (AIE) and C=N isomerization, which can be ascribed to fluorescence changes via conformational restriction are focused on.
References
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