Patent ID: 8735601

Claim:
A pentamethine cyanine dye having a general formula (I) as follows: wherein X is the general formula of (R 5 , R 6 ) amino group (II); R 1 and R 2 are selected from the group consisting of (CH 2 ) n R 8 , (CH 2 ) m OR 9 , (CHR 10 CH 2 O) p R 9 and CH 2 C 6 H 4 R 8 ; R 3 , R 4 and R 8 are selected from the group consisting of H, SO 3 R 11 and CO 2 R 12 ; R 5 is selected from the group consisting of (CH 2 ) n R 8 , (CH 2 ) m OR 9 and (CHR 10 CH 2 O) p R 9 ; R 6 is selected from the group consisting of (CH 2 ) n R 8 , (CH 2 ) m OR 9 , (CHR 10 CH 2 O) p R 9 , m-C 6 H 4 R 17 and p-C 6 H 4 R 17 ; R 9 selected from H or C 1-18 alkyls; R 10 is H or CH 3 ; R 11 is H or M; M is selected from the group consisting of Na, K and N (R 13 R 14 R 15 R 16 ); R 12 is selected from the group consisting of H, M, R 7 and C 1-18 alkyls; R 13 , R 14 , R 15 and R 16 are selected from the group consisting of H, C 1-18 alkyls, (CH 2 ) m OR 9 and (CHR 10 CH 2 O) p R 9 ; R 17 is selected from the group consisting of H, NH 2 , NHCOR 9 and (CH 2 ) n R 8 ; n is an integer chosen from 0 and 2 to 18; and m and p are integers independently chosen from 0 to 18.