Luminescent and Axially Chiral π-Conjugated Polymers Linked by Carboranes in the Main Chain

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  • Kenta Kokado
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
  • Yuichiro Tokoro
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
  • Yoshiki Chujo
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan

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Description

Sonogashira−Hagihara polycondensations of two bis(4-iodophenyl)carborane compounds with axially chiral diyne monomers having binaphthyl unit were carried out to obtain the corresponding chiral π-conjugated polymers having o- or m-carborane segment in the main chain. The polymer structures and their optical properties were characterized by 1H, 13C, and 11B NMR, FT-IR, UV−vis absorption, photoluminescence, and circular dichroism spectroscopies. Photoluminescence study revealed that the polymer having m-carborane exhibited intense blue emission in solution state, whereas polymers having o-carborane exhibited aggregation-induced emission (AIE). All polymers showed strong CD signals, indicating the construction of highly ordered conformation.

Journal

  • Macromolecules

    Macromolecules 42 (23), 9238-9242, 2009-10-26

    American Chemical Society (ACS)

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