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

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. (C) 2015 Elsevier B.V. All rights reserved.