Patent ID: 7507524

Claim:
An optical recording medium for recording and reading with a semiconductor laser light of 300 nm to 700 nm, which has a recording layer containing an azo-metal chelate dye formed from a ligand having active hydrogen in X 1 or X 2 eliminated from an azo compound of the following formula (III) and Zn 2+ ion, wherein in the above formula (III), R 21 is a hydrogen atom, a halogen atom or an ester group expressed by CO 2 R 23 in which R 23 is a linear or branched alkyl group or a cycloalkyl group; R 22 is a linear or branched alkyl group which may have a substituent; one of X 1 and X 2 is a NHSO 2 Y group in which Y is a linear or branched alkyl group substituted with at least 2 fluorine atoms, and the other is a hydrogen atom; R 24 and R 25 are respectively independently a hydrogen atom or a linear or branched alkyl group which may have a substituent; R 26 , R 27 , R 28 and R 29 are respectively independently a hydrogen atom or a C 1 -C 2 alkyl group which may have a substituent; and the NHSO 2 Y group forms a NSO 2 Y − (negative) group by eliminating H + , and an azo compound of the above formula (III) forms a coordinate bond with a metal ion.