New disazo pyrazole disperse dyes: Synthesis, spectroscopic studies and tautomeric structures

Add time:08/04/2019    Source:sciencedirect.com

5-amino-4-arylazo-3-methyl-1-phenylpyrazoles (2a–k) were diazotised and coupled with 5-hydroxy-3-methyl-1H-pyrazole and 5-hydroxy-3-methyl-1-phenylpyrazole to generate two series disazo pyrazole disperse dyes (3a–k and 4a–k). These novel synthesized disazo pyrazole disperse dyes were characterized by elemental analysis and spectral methods. Absorption ability and tautomeric structure of synthesized disazo pyrazole disperse dyes substituted with electron-withdrawing and electron-donating groups at their o, m- and p-positions were also examined in detail.

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