Progress in Research of Bifunctional Spirobenzopyran and Spironaphthooxazine Photochromic Compounds

Photochromic materials have a wide range of applications such as ophthalmic lenses, optical information storages and optical molecular switches. More and more attention was paid to the synthesis and application of bifunctional photochromic materials. This article introduces the bifunctional photochromic materials based on spirobenzopyran and spirooxazine, in which special efforts have been given to the photochromic compounds which have fluorescent and metal coordination of photochromes.