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<p>The effect of polyfluorene main chain on both luminescence and pH-sensitivity of polymethine dyes incorporated covalently into the copolyfluorenes was studied. A series of fluorene-polymethine dye copolymers were synthesized by the Suzuki-Miyaura coupling polycondensation using cyanine, keto-cyanine, and squaraine comonomers, which exhibit fluorescence at ca. 500–700&#xa0;nm. These polymers exhibit both green to red or near-infrared absorption and emission attributed to polymethine dyes, and absorption and emission bands corresponding to polyfluorene (at ca. 380 and 420−470&#xa0;nm, respectively). The influence of pH on the UV-Vis absorption and luminescence spectra of the copolymers in solution was studied.</p>

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Copolyfluorenes containing polymethine dyes in the main chain: synthesis and photophysical properties

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Elena V. Zhukova,
  • Alexander M. Mitroshin,
  • Ksenia I. Kaskevich,
  • Serguei A. Miltsov,
  • Larisa S. Litvinova,
  • Elena M. Ivan’kova,
  • Tatiana G. Chulkova,
  • Alexander V. Yakimansky

摘要

The effect of polyfluorene main chain on both luminescence and pH-sensitivity of polymethine dyes incorporated covalently into the copolyfluorenes was studied. A series of fluorene-polymethine dye copolymers were synthesized by the Suzuki-Miyaura coupling polycondensation using cyanine, keto-cyanine, and squaraine comonomers, which exhibit fluorescence at ca. 500–700 nm. These polymers exhibit both green to red or near-infrared absorption and emission attributed to polymethine dyes, and absorption and emission bands corresponding to polyfluorene (at ca. 380 and 420−470 nm, respectively). The influence of pH on the UV-Vis absorption and luminescence spectra of the copolymers in solution was studied.