STUDY OF THE EFFECT OF TEMPERATURE ON THE STABILITY CONSTANT OF A NUMBER OF AZO DYES FORMED FROM A REAGENT REACTION (O- PHENYLENE DIAMINE) WITH SOME CHALCONES

Abstract

Our work involves a spectroscopic investigation of how pH affects the thermodynamic production of azo dyes, which are created when certain chalcones react with the isotactic reagent ortho-phenylenediamine at the dye's natural acid function at a fixed temperature (298 K). We looked at the ideal circumstances for every created azo dye  along with the optimal molar ratios of its component parts, which were (2:1) for the reagent to the chalcone.

For the produced azo dyes, the stability remained constant throughout three acidic levels and six temperature ranges (273, 283, 293, 303, 313, 323 K). Then we found stability constants at the six temperatures mentioned above, It enabled us to determine that, based on the negative values of (ΔG° and ΔH), respectively, the reactions that generate azo dyes are spontaneous and heat-emitting.