| abstract |
The present invention relates to a dye of formula (1) in which two pigments are covalently linked, and a method of preparing the same.n n n <Formula 1>n n n n n n n n Wherein R 1 to R 4 may be the same or different from each other and may be hydrogen, halogen or nitro group or together form a benzene ring, R 5 is an alkyl group of C 1 -C 4 , and R 6 is C 3 -C 6 alkylene, R 7 is C 1 -C 4 alkyl group, X is O, Z is ClO 4 , PF 6 , BF 4 or halogen. |