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Photoswitch based on remarkably simple naphthopyrans |
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| Authors: | Xavier Sallenave Gaston Vermeersch Jean-Luc Pozzo |
| Affiliation: | a Photochemical Nanoscience, CNRS UMR 5802, 351 crs Libération, 33405 Talence Cedex, France b NMR and Photochemistry, CNRS UMR 8009, Faculté de Pharmacie, Université Lille 2, 59006 Lille, France c Chemistry Department, Faculty of Science, Assiut University, 71516 Assiut, Egypt |
| Abstract: | Photochromic switches built around 5-carbonyl-3,3-diphenyl-3H-naphtho[2,1-b]pyran unit have been synthesized. Their open forms are constituted of a 1:1 ratio of TC and TT-isomers according to 19F and 1H NMR investigations. Electrocyclization of TT isomers back to the closed form is efficiently achieved upon visible irradiation whereas it has been found to be a particularly unfavoured thermal process. These simple 2H-chromenes could act as molecular photoswitch at ambient temperature. |
| Keywords: | Photoswitch Naphthopyrans 19F NMR Photochromism |
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