| 摘要 |
There are disclosed compounds <IMAGE> (I) <IMAGE> (IV) wherein R1, R2 and R3 are each independently of one another hydrogen, a C1-C12alkyl group, a C1-C12alkoxy group, a C5-C8cycycloalkyl group, a C5-C8cycycloalkoxy group, a C5-C8cycloalkylthio group, a C6-C10aryl group, a C6-C10aryloxy group, a C6-C10arylthio group, nitro, halogen, cyano, -COOH, -COOR7, -NR8R9 or -CONR8R9, where R7 is C1-C20alkyl, C5-C8cycloalkyl, phenyl or phenyl-C1-C4alkyl, and R8 and R9 are each independently of the other hydrogen, C1-C8alkyl, phenyl or phenyl-C1-C4alkyl, X is nitrogen or CR4, Y is nitrogen or CR5 and Z is nitrogen or CR6, and R4, R5 and R6 are each independently of one another hydrogen, a straight-chain or branched C1-C12alkyl group or a C6-C10aryl group, with the proviso that, if X is CR4 and Y is CR5 and Z is nitrogen or CR6, or if Y is CR5 and Z is CR6 and X is nitrogen or CR4, then each pair of substituents R4 and R5 and R5 and R6 form a group -CH=C(R10)-C(R11)=CH- or a tetramethylene group, wherein R10 and R11 are each independently of the other hydrogen, C1-C6alkyl, phenyl or phenyl-C1-C4alkyl. The compounds are suitable for use as active components in thermal information recording systems, especially for laser-optical information recording media.
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