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Diphosphahexaarenes as Highly Fluorescent and Stable Materials.

Philip Hindenberg1, Marvin Busch1, Alexander Paul1

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Researchers developed stable, linearly fused diphosphahexaarenes. These novel phosphorus-containing fused arenes exhibit excellent stability and promising optoelectronic properties for advanced materials.

Keywords:
DFT calculationselectrochemistryfluorescencephosphorus heterocyclesphotophysical properties

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Supramolecular Chemistry

Background:

  • Oligoarenes are key subunits of π-extended carbon nanomaterials like graphene and nanotubes.
  • Fused arenes offer insights into electronic properties and guide the design of graphene-like materials.
  • Large π-extended arenes often suffer from low stability, limiting their applications.

Purpose of the Study:

  • To report the straightforward preparation of novel, linearly fused diphosphahexaarenes.
  • To investigate the stability and optoelectronic properties of these new phosphorus-containing fused arenes.
  • To explore the potential of incorporating phosphorus heterocycles into extended polyaromatic systems.

Main Methods:

  • Synthesis of linearly fused diphosphahexaarenes featuring two six-membered phosphorus heterocycles.
  • Stability testing under ambient conditions (air, water, light) in solution and solid states.
  • Characterization using single-crystal X-ray crystallography.
  • Investigation of optoelectronic properties, including redox behavior and fluorescence quantum yields.

Main Results:

  • Successful and straightforward preparation of the target diphosphahexaarenes.
  • Exceptional stability of the compounds towards air, water, and light for extended periods.
  • Confirmation of molecular structures through single-crystal X-ray crystallography.
  • Demonstration of ambipolar redox behavior and high fluorescence quantum yields.

Conclusions:

  • Embedding six-membered phosphorus rings into large acenes yields highly stable fused arene systems.
  • These diphosphahexaarenes possess attractive optoelectronic properties, including ambipolar redox activity and strong fluorescence.
  • This work opens new avenues for designing and investigating advanced polyaromatic systems with tailored electronic functionalities.