PHOTOSTABILIZED CYANINE DYES AND OPTICAL RECORDING MEDIUM

摘要

The cyanine dyes of the invention are well soluble in solvents having a high evaporation rate and stable against light, and thus effective for improving productivity and realizing optical recording media, especially CD-R and DVD-R optical discs, having improved light resistance. The optical recording medium of the invention uses a photo-stabilized cyanine dye which is obtained as a counter ion bonded compound between an anion of the formula (1) and a cation of the formula (2): wherein R01 and R02 each are wherein each of R11 and R12 is an alkyl group of 1 to 4 carbon atoms or phenyl group, wherein m is equal to 3, 4, 5 or 6, or phenyl groups; M is a transition metal; each of Z1 and Z2 is a fused benzene ring or fused naphthalene ring; each of R21 and R22 is an alkyl group; and n is equal to 0, 1 or 2.