NMR and kinetic investigations of the multistep photochromism of 3-thienyl-naphthopyrans

D. Venec (1) , S. Delbaere (1) , Jean Claude Micheau (2) , M. Frigoli (3, 4) , C. Moustrou (4) , A. Samat (4) , G. Vermeersch (1)

1 COM - Chimie organique et macromoléculaire
2 IMRCP - Interactions moléculaires et réactivité chimique et photochimique
3 ILV - Institut Lavoisier de Versailles
4 GCOMM - Groupe de chimie organique et matériaux moléculaires

The photocolouration under UV irradiation and the thermal relaxation after irradiation of 3-phenyl-3H-naphtho[2,1-b]pyrans linked to one, two, or three thiophene units in 3 position of the pyran moiety have been investigated by NMR. The characterization of each of the four transoid photomerocyanines, as well as the kinetic parameters of photochemical and thermal reactions were obtained and discussed.

Mots clés: Photochromism; Kinetics analysis; NMR spectroscopy

Domaines: Chimie organique

D. Venec, S. Delbaere, Jean Claude Micheau, M. Frigoli, C. Moustrou, et al.. NMR and kinetic investigations of the multistep photochromism of 3-thienyl-naphthopyrans. Journal of Photochemistry and Photobiology A: Chemistry, 2006, 183, pp.70. ⟨10.1016/j.jphotochem.2006.02.023⟩. ⟨hal-00103541⟩