SYNTHESIS, CHARACTERIZATION AND ABSORPTION PROPERTIES OF SOME NOVEL HETEROCYCLIC TETRAKISAZO DYES
Journal Title: International Journal of Pharmacy and Pharmaceutical Sciences - Year 2014, Vol 6, Issue 9
Abstract
Objective: The aim of the work was to designed and synthesized novel heterocyclic tetrakisazo dyes.Methods: 2,2'[(4,4'-dihydrazonebiphenyl)]-bis(3-iminobuthyronitrile) (1) were synthesized by diazotization of benzidine using hydrochloric acid in water. Compounds (1) reacted with hydrazine hydrate to afford the corresponding 4,4'-bis [3-methyl-5-amino-1-H-pyrazol-4-ylazo]biphenyl (2). Seven novel hetaryltetrakisazobenzidine Derivatives 3(a-g) were achieved by diazotization of 4,4'-bis [3-methyl-5-amino-1-H-pyrazol-4-ylazo]biphenyl and coupling with various coupling components.Results: The obtained hetaryltetrakisazo dyes 3(a-g) were characterized based on FT-IR, 1H-NMR, and mass spectroscopic techniques as well as elemental analysis. The solvatochromic behavior of these dyes in various solvents was examined. Acid-base effects on the visible absorption maxima of the dyes were also reported.Conclusion: Synthesis and characterization of seven of these nine novel compounds synthesized, which are hetaryltetrakisazo dyes 3(a-g).Â
Authors and Affiliations
Ä°zzet Åžener, GÃœlÅžah Aydin
Keywords
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