Homopolycyclotrimerization of A4‐type tetrayne: A new approach for the creation of a soluble hyperbranched poly(tetraphenylethene) with multifunctionalities |
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| Authors: | Rongrong Hu Jacky W Y Lam Min Li Haiqin Deng Jie Li Ben Zhong Tang |
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| Institution: | 1. The Hong Kong University of Science & Technology (HKUST) Shenzhen Research Institute, , Nanshan, Shenzhen, China, 518057;2. Department of Chemistry, Institute of Molecular Functional Materials and Division of Biomedical Engineering, , Kowloon, Hong Kong;3. Guangdong Innovative Research Team, SCUT‐HKUST Joint Research Laboratory, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology (SCUT), , Guangzhou, 51064 China |
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| Abstract: | A tetraphenylethene‐containing A4‐type tetrayne, named 1,1,2,2‐tetrakis(4‐ethynylphenyl)ethene is synthesized and its TaCl5‐Ph4Sn catalyzed homopolycyclotrimerization affords hyperbranched poly(tetraphenylethene) with high molecular weight (Mw = 280,000) in high yield (97%). The polymer shows good solubility and high thermal stability. It is aggregation‐enhanced emission (AEE)‐active and functions as a fluorescent chemosensor for explosive detection with a superamplification effect and large quenching constants up to 758,000 M?1. The polymer shows high and tunable refractive indices (RI = 1.9288?1.6746) in a wide wavelength region. Porous fluorescent polymer thin film is prepared by breath figure (BF) methods and real‐time monitoring of the elusive BF formation process is realized. Photolithography of the thin films readily generates well‐resolved fluorescent photopattern without and with porous secondary structure. The polymer is metallified and pyrolysed to give magnetic ceramics with high magnetic susceptibilities (Ms = 83 emu/g) and near‐zero coercivity (Hc = 0.08 kOe). © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013 , 51, 4752–4764 |
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| Keywords: | conjugated polymers hyperbranched luminescence porous materials structure‐property relationships |
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