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Area of Science:

  • Organic chemistry
  • Materials science
  • Photophysics

Background:

  • Polymethine dyes are crucial in various optical applications.
  • Developing novel fluorophores with enhanced properties is an ongoing research area.
  • Near-infrared (NIR) emitting dyes are particularly sought after for advanced applications.

Purpose of the Study:

  • To synthesize and characterize novel trianionic polymethine dyes.
  • To investigate the photophysical properties, including absorption, emission, and fluorescence quantum yields.
  • To explore the structural and stability aspects of these new dye molecules.

Main Methods:

  • Synthesis of trianionic polymethine dyes with dioxaborine rings and electron-accepting end groups.
  • Spectroscopic analysis (UV-Vis absorption and fluorescence emission) in DMF.
  • Determination of molar attenuation coefficients (ϵ) and fluorescence quantum yields (Φf).
  • X-ray crystallography for structural elucidation.
  • Solubility and stability studies in various solvents.

Main Results:

  • Successful synthesis of trianionic polymethine dyes of the A'-π-A-π-A-π-A' type.
  • Dyes exhibit strong absorption and emission in the near-infrared region.
  • Remarkably high molar attenuation coefficients (up to 495,000 M⁻¹cm⁻¹) and fluorescence quantum yields (up to 0.73).
  • Exceptional fluorescence brightness (ϵ⋅Φf up to 313,000 M⁻¹cm⁻¹), positioning them among the brightest known fluorophores.
  • Minor negative solvatochromism and small Stokes shifts observed.
  • X-ray data confirm a nearly planar chromophore geometry.
  • Compounds show good stability in solid-state and solution, particularly in polar aprotic solvents.

Conclusions:

  • The novel trianionic polymethine dyes represent a significant advancement in fluorophore development.
  • Their outstanding photophysical properties, especially brightness and NIR emission, open avenues for advanced optical and imaging technologies.
  • The structural and stability characteristics suggest their potential for practical applications in demanding environments.