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Synthesis of Highly Fluorescent and Soluble 1,2,4-Linking Hyperbranched Poly(arylenevinylene) Featuring Intramolecular Energy Funneling

Authors

  • Zengqi Xie,

    1. Center for Supramolecular Optoelectronic Materials and WCU Hybrid Materials Program, Department of Material Science and Engineering, ENG445, Seoul National University San56-1, Shillim-dong, Kwanak-gu, Seoul 151-744 (Korea)
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  • Seong-Jun Yoon,

    1. Center for Supramolecular Optoelectronic Materials and WCU Hybrid Materials Program, Department of Material Science and Engineering, ENG445, Seoul National University San56-1, Shillim-dong, Kwanak-gu, Seoul 151-744 (Korea)
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  • Soo Young Park

    Corresponding author
    1. Center for Supramolecular Optoelectronic Materials and WCU Hybrid Materials Program, Department of Material Science and Engineering, ENG445, Seoul National University San56-1, Shillim-dong, Kwanak-gu, Seoul 151-744 (Korea)
    • Center for Supramolecular Optoelectronic Materials and WCU Hybrid Materials Program, Department of Material Science and Engineering, ENG445, Seoul National University San56-1, Shillim-dong, Kwanak-gu, Seoul 151-744 (Korea).
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Abstract

The synthesis and optical properties of a highly soluble (>200 mg mL−1) and highly fluorescent (ΦF in film = 0.64) 1,2,4-linking hyperbranched poly(arylenevinylene) (1,2,4-hb-PAV) prepared via Wittig reaction of A3 (biphenyl-tricarbaldehyde) and B2 (phosphonium salt) monomers is reported. The molecular weight of 1,2,4-hb-PAV can be precisely controlled by the amount of the base (NaOCH3) used in the polymerization. The absorption and photoluminescence (PL) spectra of 1,2,4-hb-PAV shows distinct red-shifts compared to conventional 1,3,5-linking hyperbranched poly(arylenevinylene) (1,3,5-hb-PAV), attributed to the extended π-conjugation along ortho- (1,2-) and para- (1,4-) links. The inherent energy gradient from the shorter branches to the longer conjugated stem in 1,2,4-hb-PAV enabled a characteristic energy funneling effect, which is absent in conventional hyperbranched polymer of 1,3,5-hb-PAV.

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