Preparation, analytical studies and application of a new azodye derived from pharmaceutical materials (procaine hydrochloride & salicylic acid)

Abstract

Procaine hydrochloride was used as an aromatic amine, and salicylic acid (5-[2-(diethylamino)-4-benzoateazo]-2-hydroxybenzoic acid) was used to make a new azodye derived from pharmaceutical materials (PS).C.H.N., H1-NMR, I.R., and visible spectroscopic techniques have also been used to characterize dye.At different pH values (2 - 12), the electronic spectra of this azo dye was investigated in terms of acid-base properties, which included defining isobestic points and determining protonation and ionization constants.The effect of different polarities of solvents on the electronic spectra was the subject of another study.The dye has been used in a variety of applications, including as an indicator for strong acid with strong base and for nitrite determination.