Patent ID: 7875748

Claim:
A compound of formula (1): wherein m is an integer of 1-5; X is C═NR 1 or C═NNR 1 R 2 ; R 1 , R 2 , R 3 , R 1 ′, R 2 ′, and R 3 ′ may be the same or different from each other, and are independently selected from the group consisting of hydrogen, C 1 -C 22 aliphatic alkyl, C 1 -C 22 alicyclic alkyl, C 1 -C 22 , alkoxy, and C 6 -C 18 aryl and aryloxy; and Ar is aromatic selected from the group consisting of phenylene, naphthalene, anthracene, fluorene, arylamine, and the following structures: