Electrochemical and Phosphorescent Properties of New Ir(III) Complexes Coordinated by Various Bipyridine Derivatives

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Four useful polypyridine iridium(III) complexes in the form of [IrCl<sub>2</sub>L<sub>2</sub>]<sup>+</sup> were prepared and their spectroscopic and electrochemical properties as well as X-ray crystallography were investigated. The ligands used were L = 2,2′-bipyridine, 4,4′-dimethyl-2,2′-bipyridine, 4,4′-diphenyl-2,2′-bipyridine, 1,10-phenanthroline, 4,7-diphenyl-1,10-phenanthroline, and 2,2′-biquinoline. Synthetic methods were developed by a sequential ligand-replacement, which occurred in the reaction vessel using a microwave oven. All complexes showed that LUMOs are based on the π-system contribution of the polypyridine ligand for [IrCl<sub>2</sub>(bpy)<sub>2</sub>]<sup>+</sup>, [IrCl<sub>2</sub>(dmbpy)<sub>2</sub>]<sup>+</sup>, [IrCl<sub>2</sub>(dpbpy)<sub>2</sub>]<sup>+</sup>, [IrCl<sub>2</sub>(phen)<sub>2</sub>]<sup>+</sup>, [IrCl<sub>2</sub>(dpphen)<sub>2</sub>]<sup>+</sup> and [IrCl<sub>2</sub>(bqn)<sub>2</sub>]<sup>+</sup>. The HOMOs are also localized on the polypyridine ligand in the iridium complexes. It was found that [IrCl<sub>2</sub>L<sub>2</sub>]<sup>+</sup> emits intense phosphorescence at room temperature. In particular, the use of dpbpy as ancillary ligands extends the lifetime (660 ns) of the <sup>3</sup>(π-π<sup>*</sup>) excited states of Ir(III) polypyridine complexes. The complex [IrCl<sub>2</sub>(bqn)<sub>2</sub>]<sup>+</sup> with electron acceptor substituents shows a large red-shift to 622 nm. It is noticed that iridium polypyridine complexes show intense emissions at various colors, such as yellow for [IrCl<sub>2</sub>(dmbpy)<sub>2</sub>]<sup>+</sup> and red for [IrCl<sub>2</sub>(bqn)<sub>2</sub>]<sup>+</sup>, which can be applied to photosensitizers. The spectroscopic and electrochemical details are also reported herein.

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  • Analytical sciences : the international journal of the Japan Society for Analytical Chemistry

    Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 20(4), 711-716, 2004-04-10

    The Japan Society for Analytical Chemistry

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各種コード

  • NII論文ID(NAID)
    10012851061
  • NII書誌ID(NCID)
    AA10500785
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09106340
  • NDL 記事登録ID
    6912254
  • NDL 雑誌分類
    ZP4(科学技術--化学・化学工業--分析化学)
  • NDL 請求記号
    Z54-F482
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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