| abstract |
This invention consists of a biimidazole compound represented by General formula (1-1), It is a photochromic material characterized by the above-mentioned. [Formula 1] In which R 4 and R 5 Each independently represents a halogen atom or an alkyl group, and R 1 to R 3 and R 6 to R 8 Each independently represents a hydrogen atom, a halogen atom, an alkyl group, a fluoroalkyl group, a hydroxyl group, an alkoxyl group, an amino group, an alkylamino group, a carbonyl group, an alkylcarbonyl group, a nitro group, a cyano group or an aryl group. Ar 1 to Ar 4 Each independently represents a substituted or unsubstituted aryl group. R 4 May form a substituted or unsubstituted aryl ring condensed with R 3, and R 5 May form a substituted or unsubstituted aryl ring condensed with R 6. ) |