Patent ID: 8586973

Claim:
A compound of Formula I: wherein: A is a divalent radical selected from the group consisting of naphthyl, anthryl, phenanthryl, benzamidazolyl, carbazolyl, fluorenyl, pyridazinyl, quinolinyl, isoquinolinyl, quinoxalinyl, benzothiophenyl, phthalazinyl, quinazolinyl, benzimidazolyl, benzoxazolyl, phenanthridinyl, wherein R 11 is a tert-alkyl, fluorinated alkyl, trityl, alkoxy or halogen group; R 1 , R 2 , R 3 and R 4 are non-conjugate substituents, the same or different at each occurrence and selected from the group consisting of: trityl halogen; nitro; cyano; —COOR 5 ; alkoxy or dialkylamino group having from 1 to 20 carbon atoms wherein one or more nonadjacent —CH 2 — groups may be replaced by —O—, —S—, —NR 6 —, —CONR 7 — or —COO— and wherein at least one hydrogen atom may be replaced by halogen; and —SiR 8 R 9 R 10 ; wherein R 5 , R 6 , R 7 , R 8 , R 9 , and R 10 are the same or different at each occurrence and independently selected from the group consisting of —H, halogen, nitro, cyano, straight or branched C 1-20 -alkyl, C 3-20 -cyclic alkyl, straight or branched C 1-20 -alkoxy, C 1-20 -dialkylamino, C 4-14 -aryl, C 4-14 -aryloxy and C 4-14 -heteroaryl, which may be substituted by one or more non aromatic radicals, wherein a plurality of R 1 , R 2 , R 3 , R 4 , R 8 , R 9 , and R 10 may in turn together form a mono- or polycyclic ring, optionally aromatic; and l, m, p and q are the same or different at each occurrence and represent an integer from 0 to 4, wherein l+m+p+q>0.