Unusual Aggregation of Nanosized Six-Arm Star Oligofluorenes

Authors

  • Yang Han,

    1. Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, P. R. China
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  • Zhuping Fei,

    1. Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, P. R. China
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  • Minghao Sun,

    1. Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, P. R. China
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  • Zhishan Bo,

    Corresponding author
    1. Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, P. R. China
    • Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, P. R. China.
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  • Wan-Zhen Liang

    Corresponding author
    1. Hefei National Laboratory for Physical Sciences at micrometer-scale and Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, P. R. China
    • Hefei National Laboratory for Physical Sciences at micrometer-scale and Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, P. R. China.
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Abstract

A series of monodisperse six-arm benzene-cored star oligofluorenes are prepared by a divergent/convergent strategy, starting from the repetitive divergent synthesis of symmetrical ethynyl-bridged oligofluorenes to the convergent Co-catalyzed alkyne cyclotrimerization. The structures of these six-arm molecules are fully characterized. The diameter of the largest molecule SF3 reaches ca. 3 nm. These highly substituted star-shaped oligomers exhibit extremely high fluorescent quantum yields in solution and unexpected red-shifted and broadened emission with fine structure in the film as a result of the formation of stable aggregates.

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