Synthesis and Photochromic Behavior of Fluoro 2H-1-Benzopyrans Containing a Carbazole Moiety

ABSTRACT

The synthesis of new photochromic 2,2-di(4′-fluoro-phenyl)-2H-1-benzopyrans fused to an indole moiety is described. Spectrokinetic data (λ_max of colored form, colorability and rate constant of bleaching) obtained by UV-Visible spectroscopy and the structure of photomerocyanines elucidated by NMR spectroscopy, are reported.

Keywords:

• fluoro-benzopyrans
• hydroxycarbazole
• NMR
• photochromism
• synthesis
• UV-visible spectroscopy

Acknowledgments

The 300 MHz NMR facilities were funded by the Région Nord-Pas de Calais (France), the Ministère de l'Education Nationale, de l'Enseignement Supérieur et de la Recherche (MENESR) and the Fonds Européens de Développement Régional (FEDER). This work is supported by Calouste Gulbenkian Foundation and CPU/CRUP in the framework “Actions Universitaires Intégrées Luso-Françaises”.