| abstract |
A photochromatic compound represented by the following general formula (I): ##STR1## where: R 1 and R 2 independently represent a linear, branched or cyclic C1-C10 alkyl radical, H, OH, F, Cl, Br, NH 2 , N(R 4 ) 2 , COOH, OR 4 or COOR 4 where R 4 is a C1-C10 linear, branched or cyclic alkyl radical, or an aryl radical; n R 3 is a variously substituted mono or polycondensed heterocyclic or aryl radical. n A compound (I) demonstrates marked photochromatic characteristics both when in an organic solvent solution and when incorporated into polymer matrices. |