Abstract

SYNTHESIS, CHARACTERIZATION AND ANALYTICAL STUDIES OF SOME NEW AZODYES DRIVEN FROM O-VANILLIN

Tarek A. Fahad*, Asaad A. Ali and Abdulshahed H. Baty

Abstract

Two newo-vanillin-based Azodye ligands (Z1,Z2) were prepared by reaction of sulfadiazine and sulfaguandin and with o-vanilin (2- Hydroxy-3-methoxybenzaldehyde). The characterization of dyes have been described by C.H.N., I.R. N.M.R, mass spectra and visible. spectroscopic techniques, the electronic spectra of these azo dyes were studied in term of acid-base properties at different pH values (2- 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.

Keywords: Azo-dyes, Sulfadiazine, Sulfonamide, o-vanilin, protonation and ionization constants.