Patent ID: 8748629
Filing Date: 2014-06-10
Classification: C07D,C09K

Abstract:
1. A photochromic material formed of a biimidazole compound represented by the following formula (1-1): (where, R 4 and R 5 respectively and independently represent a halogen atom or alkyl group, R 1 to R 3 and R 6 to R 8 respectively and independently represent a hydrogen atom, halogen atom, alkyl group, fluoroalkyl group, hydroxyl group, alkoxyl group, amino group, alkylamino group, alkylcarbonyl group, nitro group, cyano group or aryl group, Ar 1 to Ar 4 respectively and independently represent a substituted or unsubstituted aryl group, or R 4 may form a condensed, substituted or unsubstituted aryl ring with R 3 , and R 5 may form a condensed, substituted or unsubstituted aryl ring with R 6 ).