| 摘要 |
PROBLEM TO BE SOLVED: To obtain a coloring matter suitable as an optical recording medium especially suitable for reproducing records with semiconductor laser beams at a short wavelength. SOLUTION: This azo-based coloring matter is represented by general formula (1) [ring A denotes an aromatic ring containing a heterocyclic ring and a condensed ring; X denotes a group containing an active hydrogen; Y denotes O, S or NR3 (R3 denotes hydrogen or an alkyl group); and R1 and R2 denote each independently hydrogen, a hydrocarbon group which may have a substituent group, a heterocyclic group which may have a substituent group, NR4R5, OR6 or SR7 (R4 to R7 denote each hydrogen or an optional substituent group)]. |
