Abstract
A series of azo coumarin dyes was synthesized by the coupling of 4-hydroxy coumarin and diazonium salts, which obtained by diazotization of aniline and aniline derivatives. The azo dyes were characterized by IR, 1HNMR and UV-Visible spectra. The acid dissociation constants, K a, of the dyes were determined using electronic spectroscopic method. Substitutions effect on this parameter was reported and discussed.
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