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International Journal of Photoenergy
Volume 2006, Article ID 43213, 7 pages

Photochromism of indolino-benzopyrans studied by NMR and UV-visible spectroscopy

1CNRS UMR 8009, Laboratoire de Physique, Faculté de Pharmacie, Université de Lille 2, Lille Cedex 59006, France
2Centro de Química, Universidade de Trás-os-Montes e Alto Douro, Vila Real 5000-911, Portugal

Received 20 February 2006; Accepted 20 February 2006

Copyright © 2006 S. Delbaere et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The synthesis of photochromic 3,3-di(4-fluorophenyl)-3H-benzopyrans fused to an indole moiety is described. The structures of photomerocyanines elucidated by NMR spectroscopy and spectrokinetic data (λmax of colored form, colorability, and rate constant of bleaching) obtained by UV-visible spectroscopy are reported.