A series of heteroarylazo disperse dyes derived from pyrazolones and fluorosulfonyl anilines were synthesized, and their thermal and spectral properties were investigated with respect to the effect of substituents on absorption spectra, halochromism, and solvatochromism. Heteroarylazo disperse dyes, which contain a nitro group instead of a fluorosulfonyl group para to the azo group in the diazo component, were also synthesized ...
![3-methyl-4-[(4-nitrophenyl)diazenyl]-1,4-dihydropyrazol-5-one结构式](https://image.chemsrc.com/caspic/102/90844-48-7.png)
