Aggregation-Induced Emission in a Hyperbranched Poly(silylenevinylene) and Superamplification in Its Emission Quenching by Explosives
✍ Scribed by Ping Lu; Jacky W. Y. Lam; Jianzhao Liu; Cathy K. W. Jim; Wangzhang Yuan; Ni Xie; Yongchun Zhong; Qin Hu; Kam Sing Wong; Kevin K. L. Cheuk; Ben Zhong Tang
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 303 KB
- Volume
- 31
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
A silicon‐containing hyperbranched polymer (hb‐P1/2) with σ*–π* conjugation was prepared in a good yield and high molecular weight by rhodium‐catalyzed alkyne polyhydrosilylation of 1,2‐bis(4‐ethynylphenyl)‐1,2‐diphenylethene (1) with tris(4‐dimethylsilylphenyl)amine (2). The polymer was thermally stable, losing merely 5% of its weight when heated to ≈445 °C. Whereas hb‐P1/2 was weakly luminescent when molecularly dissolved, it became highly emissive when supramolecularly aggregated, showing an aggregation‐induced emission (AIE) phenomenon. A superamplification effect was observed when the AIE nanoaggregates were used as fluorescent chemosensor for explosive detection: the quenching efficiency was greatly increased in a nonlinear fashion with increasing quencher concentration.
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