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<p>In this work, two novel <i>N</i>, <i>O</i> - chelate fluoroborane fluorescent dyes TN-1 and TN-2 with different substituents on indanone unit were synthesized via condensation reaction from indanone derivatives and benzo[cd]indol-2(1<i>H</i>)-one followed by fluorine-boron coordination reaction. To increase the solubility of dyes, TN-2-H and TN-2-M were designed and synthesized by another condensation reaction on active site of indanone unit on TN-2 with benzaldehyde derivatives. The optical properties of these compounds in different solvents and solid state were discussed. The maximum fluorescence emission wavelength is 654&#xa0;nm with a fluorescence quantum yield (FQY) of 12% in toluene and the maximum solid fluorescence emission wavelength reaches 737&#xa0;nm with an FQY of 3.15%. All the compounds were characterized by NMR, HRMS, UV-Vis absorption and fluorescence emission spectroscopy. TN-2-M was further characterized by single crystal diffraction analysis, and DFT calculations were used for modeling structure and spectra. It provide a theoretical basis for the design of near - infrared (NIR) dual - effect fluorescent dyes.</p>

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N, O - Chelate Fluoroborane Dyes: Synthesis, Optical Properties in Dual Aggregate State

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • Yangyang Liu,
  • Debao Liu,
  • Nuonuo Zhang,
  • Jiaying Yan

摘要

In this work, two novel N, O - chelate fluoroborane fluorescent dyes TN-1 and TN-2 with different substituents on indanone unit were synthesized via condensation reaction from indanone derivatives and benzo[cd]indol-2(1H)-one followed by fluorine-boron coordination reaction. To increase the solubility of dyes, TN-2-H and TN-2-M were designed and synthesized by another condensation reaction on active site of indanone unit on TN-2 with benzaldehyde derivatives. The optical properties of these compounds in different solvents and solid state were discussed. The maximum fluorescence emission wavelength is 654 nm with a fluorescence quantum yield (FQY) of 12% in toluene and the maximum solid fluorescence emission wavelength reaches 737 nm with an FQY of 3.15%. All the compounds were characterized by NMR, HRMS, UV-Vis absorption and fluorescence emission spectroscopy. TN-2-M was further characterized by single crystal diffraction analysis, and DFT calculations were used for modeling structure and spectra. It provide a theoretical basis for the design of near - infrared (NIR) dual - effect fluorescent dyes.