Coumarins: their versatile use in photoredox catalysis and biological applications.

Coumarin dyes have proven to posses unique photophysical properties thanks to the high quantum yield, and stability and an absorption and emission which cover the most part of the visible spectrum. In particular, a peculiar characteristic of this class of fluorophores is the large Stokes shift. Thanks to these exceptional photophysical properties, coumarin dyes are widespread used in different applications including fluorescent bio-label, emitting materials in OLED and dyes in solar cells as example. To the best of our knowledge their systematic use in photoredox catalysis has not been explore yet. This research aimed at the design, the synthesis, the photophysical characterization of new LSS coumarin dyes and their use in different fields such as photoredox catalysis, photopolymerization and biological applications (bioconiugation and fluorescent microscopy).