| 摘要 |
Novel water soluble dyes of the formula I are provided <IMAGE> (I) wherein R1 and R4 are alkyl of 1 to 4 carbon atoms or hydrogen; or R1-R2 or R2-R4 form part of aliphatic heterocyclic rings; R2 is hydrogen or joined with R1 or R4 as described above; R3 is -(CH2)m-SO3-, where m is 1 to 6; X is N, CH or <IMAGE> where Y is 2 -SO3-; Z is 3, 4, 5 or 6 -SO3-. The novel dyes are particularly useful as the active media in water solution dye lasers.
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