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    ZHANG Wan, CAI Xinye, LI Hongkun, LI Yongfang. Synthesis and Characterization of an Aggregation-Induced Emission-Active Polymer with Amino Acid-Containing Side Chains[J]. Journal of Functional Polymers, 2019, 32(6): 711-717. doi: 10.14133/j.cnki.1008-9357.20190729002
    Citation: ZHANG Wan, CAI Xinye, LI Hongkun, LI Yongfang. Synthesis and Characterization of an Aggregation-Induced Emission-Active Polymer with Amino Acid-Containing Side Chains[J]. Journal of Functional Polymers, 2019, 32(6): 711-717. doi: 10.14133/j.cnki.1008-9357.20190729002

    Synthesis and Characterization of an Aggregation-Induced Emission-Active Polymer with Amino Acid-Containing Side Chains

    • A dibromo aryl monomer ( 1 ) bearing L-valine methyl ester group was synthesized by the Cu(I)-catalyzed azide-alkyne click reaction. The Sonogashira polycoupling between 1 and tetraphenylethene (TPE)-containing diethynyl monomer ( 2 ) was then carried out, affording a soluble TPE-based conjugated polymer P (TPE-Val) decorated with chiral amino acid-containing side chains. The structure of the polymer as characterized by Fourier transform-infrared (FT-IR) spectroscopy, nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), and thermo gravimetric analyzer (TGA). The properties of the polymer were investigated by fluorescence spectroscopy, circular dichroism spectroscopy, and scanning electron microscopy (SEM). The emission of the polymer is very weak in its dilute solution, but turns to be very high in the aggregated state, showing aggregation-induced emission (AIE) characteristics. Furthermore, the polymer gives circular dichroism (CD) signals in the aggregated state, and has the capacity to self-assemble into helical nanofibers.
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