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Fluorescent molecular systems based on carborane-perylenediimide conjugates.

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New perylenediimide (PDI)-based ortho-carborane (o-carborane) derivatives show high fluorescence and improved solubility. PDI-CB1 exhibits red excimer emission in nanoparticles, suggesting theranostic potential for cancer treatment.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Nanotechnology

Background:

  • Perylene diimides (PDIs) are known for their excellent optical properties but often suffer from aggregation-caused quenching.
  • Ortho-carboranes (o-carboranes) are boron-rich cage compounds with potential applications in medicine and materials science.

Purpose of the Study:

  • To synthesize novel PDI-o-carborane derivatives (PDI-CB1 and PDI-CB2) with enhanced solubility and maintained optical properties.
  • To investigate the impact of o-carborane incorporation on the photophysical behavior and aggregation of PDIs.
  • To explore the potential of these new materials in theranostics, specifically for boron neutron capture therapy (BNCT).

Main Methods:

  • Synthesis of alkyne-terminated PDIs (PDI1 and PDI2).
  • Insertion of decaborane into PDI1 and PDI2 to form PDI-CB1 and PDI-CB2 using a methylene linker.
  • Optical property measurements (absorption, fluorescence quantum yield) in solution.
  • Aggregation studies in various solvents.
  • Solid-state emission analysis and nanoparticle formation.

Main Results:

  • Successful synthesis of PDI-CB1 and PDI-CB2 with retained high fluorescence quantum yields (~100%) in solution.
  • Enhanced solubility of PDI-CB1 and PDI-CB2 in both nonpolar and aqueous solvents compared to parent PDIs.
  • Aggregation-caused fluorescence quenching observed in the solid state for both derivatives.
  • PDI-CB1 demonstrated bright red excimer-type emission in solid state and in water-dispersible nanoparticles.

Conclusions:

  • The incorporation of o-carborane groups via a methylene linker effectively enhances PDI solubility without compromising solution optical properties.
  • Solid-state emission is susceptible to aggregation, but PDI-CB1 exhibits unique red excimer emission.
  • PDI-CB1's ability to form stable nanoparticles with preserved red emission indicates significant potential as a theranostic agent for fluorescence imaging and BNCT.