| 摘要 |
A hemicyanine dye of formula (1) and an optical recording medium using the hemicyanine dye as an optical recording medium are provided: <CHEM> wherein Z is a benzene ring, naphthalene ring or anthracene ring; X1 is S, O, Se, NR or C(CH3)2; X2 is S, NR or O, where R is hydrogen or an alkyl group of 1 to 5 carbon atoms; R1 is hydrogen, halogen atoms, an alkyl group of 1 to 3 carbon atoms or a nitro group; each of R2 and R5 is an alkyl group of 1 to 5 carbon atoms; each of R3 and R4 is hydrogen, an hydroxy group, an alkyl group of 1 to 4 carbon atoms, a halogen atom or a halide; Y is Cl, Br, I, CIO4, BF4, BrO4, PF6, CH3SO3, CF3SO3, 4-CH3C6H4SO3, C6H5SO3, 6-SO3C10H6SO3 or HSO4; n is an integer of 0-2; and m is an integer of 1-2. The hemicyanine dye having formula (1) above is easy to synthesize with high yield. Thus, use of the hemicyanind dye as an optical recording medium is advantageous in terms of the manufacturing costs. An optical recording medium using the hemicyanine dye has improved recording characteristics in terms of jitter and modulation factor. <IMAGE> |
