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
Department of Chemistry, Institute of Molecular Functional Materials, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, China; HKUST Fok Ying Tung Research Institute, Nansha, Guangzhou, China; Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China.
Macromol Rapid Commun. 2010 May 12;31(9-10):834-9. doi: 10.1002/marc.200900794. Epub 2010 Apr 6.
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.
通过铑催化1,2-双(4-乙炔基苯基)-1,2-二苯乙烯(1)与三(4-二甲基硅基苯基)胺(2)的炔烃多氢硅基化反应，以良好的产率和高分子量制备了一种具有σ*-π*共轭的含硅超支化聚合物(hb-P1/2)。该聚合物具有热稳定性，加热至约445 °C时仅失重5%。虽然hb-P1/2在分子溶解时发光较弱，但在超分子聚集时会发出强烈的荧光，表现出聚集诱导发光(AIE)现象。当将AIE纳米聚集体用作爆炸物检测的荧光化学传感器时，观察到超放大效应：随着猝灭剂浓度的增加，猝灭效率以非线性方式大幅提高。
