Patent ID: 7767829

Claim:
A compound selected from: wherein: at least one of groups R 1 , R 2 , R 11 , R 12 , R 13 and R 14 is -L-M or -L-P, where L is a linking group having the formula: —(CHR′) p -Q-(CHR′) r — where Q is selected from: —CHR′—, —NR′—, —O—, —S—, —C(O)—NR′— and —C(O)—O—, where R′ is hydrogen or C 1 -C 4 alkyl; p is 0-5 and r is 1-5; M is a target bonding group; and P is a conjugated component; when any of groups R 1 , R 2 , R 11 , R 12 , R 13 and R 14 is not -L-M or -L-P, said remaining groups R 1 , R 2 , R 11 , R 12 , R 13 and R 14 are selected independently from C 1 -C 6 alkyl, and —(CH 2 ) k —SO 3 H, where k is an integer from 1 to 10; at least one of groups R 3 , R 4 , R 5 and R 6 and/or groups R 7 , R 8 , R 9 and R 10 are perfluoro C 1 -C 4 alkyl and any remaining groups R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 and R 10 are selected from H or F; groups R 16 , R 17 , R 18 , R 19 , R 20 , R 21 , R 22 and R 23 when present are selected independently from hydrogen, —SO 2 —CF 3 and —(CF 2 ) m —F, where m is 0 or an integer from 1 to 4; and n is an integer from 1 to 3.