Synthesis and spectral properties of some new derivatives of 4 aminoantipyrine Azo dyes part I

Abstract EN

This study involves the synthesis of three new azo dyes 4-aminoantipyrine with 8-hydroxyquinoline (L1), 2-thiobarbituric acid (L2) and 2-methylthiobarbituric acid (L3).

The characterization of dyes have been described by C.H.N., I.R.

and visible.

spectroscopic techniques, the electronic spectra of these azo dyes were studied in term of acid-base properties at different pH values ( 0.65-12 ), which includes establishing isobestic point , mechanism and determination of protonation and ionization constants of dyes.

The effect of solvents of different polarities on the electronic spectra were also investigated.