期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 50, 期 11, 页码 2265-2274出版社
WILEY
DOI: 10.1002/pola.26006
关键词
aggregation-enhanced emission; explosive detection; fluorescence; heteroatom-containing polymers; synthesis
资金
- National Natural Science Foundation of China [21074028, 21104012]
- Natural Science Foundation of Zhejiang Province [Y4110331]
- Research Grant Council of Hong Kong [HKUST2/CRF/10, N_HKUST620/11]
Hydrosilylation polymerizations of 1,1-dimethyl-2,5-bis(4-ethynylphenyl)-3,4-diphenylsilole with aromatic silylhydrides including 1,4-bis(dimethylsilyl)benzene, 4,4'-bis(dimethylsilyl) biphenyl, 2,5-bis(dimethylsilyl) thiophene, and 2,7-bis(dimethylsilyl)-9,9-dihexylfluorene in the presence of Rh(PPh3)(3)Cl catalyst in refluxed tetrahydrofuran afford a series of silole-containing poly(silylenevinylene)s. Under optimum condition, the alkyne polyhydrosilylation reactions progress efficiently and regioselectively, yielding polymers with high molecular weights (M-w up to 95,300) and good stereoregularity (E content close to 99%) in high yields (up to 92%). The polymers are processable and thermally stable, with high decomposition temperatures in the range of 420-449 degrees C corresponding to 5% weight loss. They are weakly fluorescent in the solution state but become emissive in the aggregate and film states, demonstrating their aggregation-enhanced emission characteristics. The explosive sensing capabilities of the polymers are examined in both solution and aggregate states. The emissions of the polymers aggregates in aqueous mixture are quenched more efficiently by picric acid in an exponential pattern with high quenching constants (up to 27,949 L mol(-1)), suggesting that the polymers aggregates are sensitive chemosensors for explosive detection. (C) 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 2265-2274, 2012
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