DYES AND PIGMENTS, cilt.27, sa.4, ss.313-320, 1995 (SCI-Expanded)
The synthesis of hetarylazopyridone dyes by coupling 1-butyl-3-cyano-6-hydroxy-4-methyl-2(1H)pyridone with diazotized aminothiazoles and aminobenzothiazoles is reported. Visible absorption spectra of the dyes were examined in various solvents and the compounds in solution exhibited hydrazone-common anion equilibrium. The hetarylazopyridones readily undergo acid dissociation into the common anion in methanol, DMF and DMSO. The effect of temperature on the visible absorption spectra is also discussed.