Synthesis of Highly Functionalized BOPHY Chromophores Displaying Large Stokes Shifts

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Abstract
BOPHY dyes bearing bromo (in 5,5′-position) and iodo (in 4,4′-position) were synthesized. Double Knoevenagel reactions allow the extension of conjugation, resulting in an absorption above 625 nm. Selective cross-coupling reactions promoted by palladium(0) and microwave irradiation allow linking of a perylene module. These dyes are highly fluorescent, and the intramolecular cascade energy transfer from the perylene moiety to the BOPHY framework is almost quantitative, providing large virtual Stoke shifts (>5100 cm–1).
Funding Information
  • Ministère de l'Enseignement Supérieur et de la Recherche
  • European Regional Development Fund

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