Patent ID: 8298766

Claim:
A category of fluorescent dyes, having Formula I: wherein X is C(CH 3 ) 2 , O, S, or Se, m is an integer from 1 to 18, R 1 and R 2 are each independently selected from the group consisting of H, C 1-18 alkyl, OR 7 , C 1-6 alkyl-OR 7 and halogen, R 3 is selected from the group consisting of pyrrolyl, imidazolyl, piperidinyl, piperazinyl, morpholinyl, guanidino, NHR 5 and N(R 6 ) 2 , R 4 is selected from the group consisting of C 1-18 alkyl, benzyl and (CH 2 ) m R 3 ; said benzyl is optionally substituted with one or more substituents, independently selected from the group consisting of H, C 1-18 alkyl, CN, COON, NH 2 , NO 2 , OH, SH, C 1-6 alkoxy, C 1-6 alkyl amino, C 1-6 amido, halogen and C 1-6 halo-alkyl, R 5 is selected from the group consisting of saturated and/or unsaturated, straight-chained and/or branched-chained C 1-18 alkyl, hydroxy alkyl, mercapto-alkyl, amino alkyl, and acyl, R 6 is a C 2-18 alkyl, R 7 is H or a C 1-18 alkyl, and Y − is an anion.