| 摘要 |
A photostable cyanine dye possessing a structure represented by the general formula I or II: phi <+> - L = psi . Q<-> (I) phi = L - psi <+> . Q<-> (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 denotes an anion represented by the general formula III: <CHEM> wherein M denotes a transition metal atom, R<1>, R<2>, R<3> and R<4> each denote a hydrogen atom, a halogen atom, an alkyl group, or a dialkylamino group and preparation thereof. The invention extends to a method of making such a dye and an optical recording medium comprising such a photostable cyanine dye. |
