Importance

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Abstract

A photostable cyanine dye possessing a structure represented by the general formula I or II: .phi..sup.+ L=.PSI..multidot.Q.sup.- (I) .phi.=L-.PSI..sup.+ .multidot.Q.sup.- (II) wherein .phi. denotes a monovalent or divalent residue of thiazole ring, oxazole ring, selenazole ring, imidazole ring, pyridine ring, indolenine ring, benzoindolenine ring or dibenzoindolenine ring which may have an aromatic ring condensed thereto, .PSI. denotes a divalent or monovalent residue of thiazole ring, oxazole ring, selenazole ring, imidazole ring, pyridine ring, indolenine ring, benzoindolenine ring or dibenzoindolenine ring which may have an aromatic ring condensed thereto, L denotes a polymethine connecting group for the formation of a cyanine dye, and Q.sup.- denotes an anion represented by the general formula III: ##STR1## wherein M denotes a transition metal atom, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each denote a hydrogen atom, a halogen atom, an alkyl group, or a dialkylamino group and preparation thereof, and an optical recording medium according to Claim 18, wherein said photostable cyanine dye possesses a structure represented by the general formula I or II. .phi..sup.+ -L=.PSI..multidot.Q.sup.- (I) .phi.=L-.PSI..sup.+ .multidot.Q.sup.- (II) wherein .phi., .PSI., L and Q.sup.- have the same meanings as defined above.

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First Claim