Patent ID: 8129532

Claim:
An amino oligo thiophene dye having the structure wherein m is 1, 2, 3, or 4; n is 2, 3, 4, 5, or 6; R 1 and R 2 are each independently hydrogen or optionally substituted C 1 -C 10 alkyl, C 3 -C 7 cycloalkyl, or phenyl; R 3 is optionally substituted C 1 -C 10 alkyl; R 4 , R 5 , R 6 , and R 7 are each independently hydrogen or fluorine; or R 4 and R 5 collectively form a fused aromatic ring, and/or R 6 and R 7 collectively form a fused aromatic ring; each occurrence of R 8 , R 9 , R 10 , and R 11 is independently hydrogen or halogen, or R 10 and R 11 collectively form ethylenedioxy (—OCH 2 CH 2 O—); provided that at least two adjacent thiophene groups can, optionally, be linked via a fused ring to form a dithiophene unit having the structure wherein R 12 and R 13 are each independently hydrogen or optionally substituted C 1 -C 6 alkyl; X q− is an anionic counterion wherein q is 1 or 2 or 3; and p is 0, 1, 2, 3, or 4.