Patent ID: 7501171

Claim:
An optical information recording medium having light interference layers including a recording layer on a substrate, wherein the recording layer comprises an organic dye and a photostabilizer, said photostabilizer comprising a combination of the compound of formula 1 and the compound of formula 2: wherein R 1 to R 8 are such that at least one of these substituents represents a substituted alkyl group having a terminal cyano group; the other substituents among R 1 to R 8 each represent a different substituent including a linear or branched alkyl group or a hydrogen atom; Y represents 1+ (monovalent cation) or 2 + (divalent cation); X m− represents an anion; and m represents 1 or 2; wherein ring A represents a heterocyclic ring formed with the carbon atom and the nitrogen atom to which the ring is bonded; ring B represents a benzene ring which may be substituted; ring C represents a heterocyclic ring including the nitrogen atom to which the ring is bonded, while this ring may be bonded to ring B; X′ represents a group which can have active hydrogen; M 2+ represents a divalent metal cation; and the whole compound represents a metal complex in which two molecules of the entire anion as the azo dye molecule are bonded to 1 molecule of M 2+ .