Formation of an intermolecular charge transfer excited state of long chain oligosilanes bearing electron-donating and -accepting groups

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Other Title
  • 電子供与基および電子吸引基を導入した長鎖オリゴシランの分子内電荷移動励起状態

Description

We report here photophysical properties of long-chain oligosilanes with various aromatic substituents at alpha and omega positions. We have found that 1,8-bis(4-dimethylaminophenyl)octasilane exhibits characteristic dual fluorescence (local and intramolecular CT emission) in polar solvents. Since the CT emission is emphasized when the aryl group has an electron-releasing group such as dimethylamino group, the aryl moiety acts as donor and octasilane moiety acceptor in the CT excited state. On the contrary, Kira, Sakurai, and co-workers demonstrated previously that aryldisilanes show dual fluorescence emitted form a CT state in the opposite direction, i.e. the aryl moiety acts as acceptor and disilanyl moiety donor. The change of the electronic role of silicon moieties in the excited state of aryloctasilanes is ascribed to elongation of sigma-conjugation that results in stabilization of LUMO level of octasilane. Synthesis and properties of a push-pull type substituted oligosilane, 1- (4-dimethylaminophenyl)-8-(4-trifluoromethylphenyl)octasilane, are also discussed.

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Details 詳細情報について

  • CRID
    1390001205556661504
  • NII Article ID
    130004646060
  • DOI
    10.11494/kisoyuki.2011.0.82.0
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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