| abstract |
(57) [Problem] To provide an asymmetric benzoxanthene dye of a kind useful as a fluorescent dye. SOLUTION: The following formula: An asymmetric benzoxanthene dye compound having Y 1 and Y 2 are independently hydroxyl, oxygen, iminium, or amine. R 1 to R 8 are independently Hydrogen, fluorine, chlorine, lower alkyl, lower alkene, lower alkyne, sulfonate, amino, ammonium, amide, nitrile, alkoxy, linking group or a combination thereof. And R 9 is acetylene, alkane, alkene, cyano, substituted phenyl, or a combination thereof, wherein the substituted phenyl has the following structure: X 1 is a carboxylic or sulfonic acid; X 2 and X 5 are independently hydrogen, chlorine, fluorine, or lower alkyl; and X 3 and X 4 are independently hydrogen, chlorine, fluorine, lower alkyl, carboxylic acid, A compound which is a sulfonic acid or a linking group. |