Patent ID: 6939963

Claim:
A corrole of formula I: wherein: Ar is aryl or heteroaryl; M is absent or is a metal selected from the group consisting of Al, Ga, Co, Mn, Fe, Ru, Sn, Cr and Rh; E 2 , E 3 and E 17 , the same or different, each is H, SO 2 Cl, SO 3 H, SO 2 NR 1 R 2 , CO 2 H, CO 2 R, COCl, CONR 1 R 2 , CHO or NO 2 , R is alkyl or aryl, and R 1 and R 2 , the same or different, each is H, alkyl, aryl or together with the N atom to which they are attached form a saturated 5-6 membered ring optionally containing a further heteroatom selected from the group consisting of O, S and N; and E 18 is H or CHO; or E 3 and E 18 each is H and E 2 and E 17 each is SO 2 , both SO 2 groups being linked by a bridge R 3 N(R 4 )-phenyl-(R 4 )NR 3 , wherein R 3 is H, alkyl, phenyl or aralkyl, and R 4 is alkylene; and provided that at least one of E 2 , E 3 , E 17 and E 18 is not H.