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Aggregation‐Induced Emission in a Hyperbranched Poly(silylenevinylene) and Superamplification in Its Emission Quenching by Explosives
Author(s) -
Lu Ping,
Lam Jacky W. Y.,
Liu Jianzhao,
Jim Cathy K. W.,
Yuan Wangzhang,
Xie Ni,
Zhong Yongchun,
Hu Qin,
Wong Kam Sing,
Cheuk Kevin K. L.,
Tang Ben Zhong
Publication year - 2010
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200900794
Subject(s) - aggregation induced emission , quenching (fluorescence) , polymer , fluorescence , luminescence , yield (engineering) , photochemistry , amine gas treating , chemistry , explosive material , alkyne , polymer chemistry , materials science , catalysis , organic chemistry , physics , optoelectronics , metallurgy , quantum mechanics
A silicon‐containing hyperbranched polymer ( hb ‐P 1 / 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 ‐P 1 / 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.