Synthesis, characterization and spectroscopic properties of some new azo dyes derived from 6-aminopyrimidine-2, 4(1H, 3H) – dione

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A series of new azo amino uracil dyes were synthesized by diazotization of nine aromatic amines using sodium nitrite and hydrochloric acid and subsequent coupling to 6-aminopyrimidine-2, 4(1H, 3H) – dione. The effects of solvents, substituents, acid and base on the visible absorption maxima of the dyes were also discussed.

azo Uracil dyes; spectroscopic properties; tautomerism; solvent effect