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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Investigating multi-functionalized chromophores is crucial for developing advanced optical materials.
  • Designing versatile building blocks simplifies the synthesis of complex molecular architectures.

Purpose of the Study:

  • To design and synthesize a universal cross-shaped organic framework as a template for multi-functionalized chromophores.
  • To explore selective functionalization and characterization of the resulting compounds.
  • To investigate intramolecular energy transfer in hybrid chromophore systems.

Main Methods:

  • Synthesis of a cross-shaped building block with peripheral bromine and iodine atoms.
  • Gram-scale synthesis via a five-step reaction including oxidative homo-coupling and macro-cyclization.
  • Selective Suzuki cross-coupling reactions with various chromophore derivatives (methoxynaphthalene, naphthalimide, BODIPY).
  • Chiral stationary phase High-Performance Liquid Chromatography (HPLC) for enantiomeric resolution.
  • Electronic Circular Dichroism (ECD) spectroscopy and single-crystal X-ray diffraction for enantiomer assignment.

Main Results:

  • Successful synthesis of a gram-scale, five-step universal cross-shaped building block.
  • Selective functionalization yielded a library of bis- and tetra-substituted cross-shaped chromophore compounds.
  • Enantiomeric resolution of racemic compounds and assignment of absolute configurations.
  • Demonstration of intramolecular Förster Resonance Energy Transfer (FRET) in a hybrid naphthalimide/BODIPY system.

Conclusions:

  • The developed cross-shaped building block is a versatile and easily functionalizable platform for chromophore research.
  • This approach facilitates the study of diverse chromophore sets and their photophysical properties.
  • The findings contribute to the design of novel functional organic materials with tailored optical characteristics.