The synthesis, antimicrobial activity and absorption characteristics of some novel heterocyclic disazo dyes

• Published in: Dyes and pigments Vol. 80; no. 1; pp. 47 - 52
• Main Authors: Karcı, Fikret, Şener, Nesrin, Yamaç, Mustafa, Şener, İzzet, Demirçalı, Aykut
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2009
• Subjects: 3-Aminocrotononitrile; Antimicrobial activity; Disazo dyes; Malononitrile; Pyrazole; Solvatochromism; Disazo dyes; Solvatochromism; Malononitrile; Antimicrobial activity; 3-Aminocrotononitrile; Pyrazole
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2008.05.001

Aniline derivatives were diazotized and coupled with 3-aminocrotononitrile to give the corresponding 2-arylhydrazono-3-ketiminobutyronitriles. Cyclization of these arylhydrazono derivatives with hydrazine monohydrate afforded 5-amino-4-arylazo-3-methyl-1
H-pyrazoles which were subsequently diazotised and coupled with malononitrile to yield a series of pyrazolylhydrazonomalononitriles. These compounds were then reacted with hydrazine monohydrate to provide 10, novel, heterocyclic disazo dyes, which were characterized by elemental analysis and spectral methods. The antimicrobial activity and absorption characteristics of the dyes were also examined in detail.