Patent ID: 8299459

Claim:
A diindenopicene compound represented by general formula [1] described below: wherein R 1 to R 4 are each a hydrogen atom, an alkyl group, an unsubstituted phenyl group or a phenyl group substituted by an alkyl group, provided that a combination of substituents represented by R 1 to R 4 is any of the following (1) to (4): (1) R 1 , R 2 , R 3 and R 4 are all hydrogen atoms; (2) R 1 and R 4 are each an alkyl group, an unsubstituted phenyl group or a phenyl group substituted by an alkyl group, and R 2 and R 3 are each a hydrogen atom, wherein R 1 and R 4 are identical or different; (3) R 2 and R 3 are each an alkyl group, an unsubstituted phenyl group or a phenyl group substituted by an alkyl group, and R 1 and R 4 are each a hydrogen atom, wherein R 2 and R 3 are identical or different; (4) R 1 is an alkyl group, an unsubstituted phenyl group or a phenyl group substituted by an alkyl group, R 2 and R 4 are each a hydrogen atom, and R 3 is a hydrogen atom, an unsubstituted phenyl group or a phenyl group substituted by an alkyl group, wherein when both R 1 and R 3 are an unsubstituted phenyl group or a phenyl group substituted by an alkyl group, R 1 and R 3 are identical or different.