申请人:Ciba-Geigy Corp.
公开号:US05208354A1
公开(公告)日:1993-05-04
Compounds of formula I or V or mixtures thereof ##STR1## wherein R is unsubstituted C.sub.6 -C.sub.14 aryl or C.sub.6 -C.sub.14 aryl which is substituted by C.sub.1 -C.sub.12 alkyl, C.sub.1 -C.sub.12 alkoxy, C.sub.1 -C.sub.12 alkylthio, phenyl, benzyl, --CN, --CF.sub.3, halogen or --COOR.sub.5, and R.sub.5 is H, C.sub.1 -C.sub.18 alkyl, cyclohexyl, cyclopentyl, phenyl, C.sub.1 -C.sub.12 alkylphenyl, benzyl or C.sub.1 -C.sub.12 alkylbenzyl, and at least one of the substituents R.sub.1 to R.sub.4 is --F, --Cl or --Br, or is independently the group RO--, and the other substituents R.sub.1 to R.sub.4 are H, --F, --Cl or --Br, are reversible photochromic systems which can be used for contrast formation, light absorption or for the reversible optical storage of information.
式I或V或它们的混合物的化合物##STR1##其中R是未取代的C.sub.6 -C.sub.14芳基或被C.sub.1 -C.sub.12烷基,C.sub.1 -C.sub.12烷氧基,C.sub.1 -C.sub.12烷硫基,苯基,苄基,-CN,-CF.sub.3,卤素或-COOR.sub.5取代的C.sub.6 -C.sub.14芳基,而R.sub.5是H,C.sub.1 -C.sub.18烷基,环己基,环戊基,苯基,C.sub.1 -C.sub.12烷基苯基,苄基或C.sub.1 -C.sub.12烷基苄基,且取代基R.sub.1至R.sub.4中至少一个是-F,-Cl或-Br,或独立地是RO-群,而其他取代基R.sub.1至R.sub.4是H,-F,-Cl或-Br,是可逆的光致变色系统,可用于对比度形成,光吸收或可逆光学信息存储。