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Influence of temperatures on the stability constants values for some dyes formed by reactions of donors imines and the diazotized sulphanilic sodium salt

A.S.P.Azzouz, M.M.H.Al-Niemi

In this work, a numbers of dyes were prepared by reactions of donor imines derived from mother aldehyde as 2,4- dihydroxy benzaldehydewith diazotized sulphanilic sodiumsalt as an acceptor. These imineswere oximes in a forms of syn and anti forms beside Schiff bases hading a substituents on the primary amines part of the molecules as OH, NH2, CH3 and NO2. A spectrophotometric method was used for the investigation of stability constants values of dyesmentioned at pH values of 5.1, 7.1 and 9.2 at temperature range (283–323)K. The thermodynamic parameters of dyes formations, namely G, H and S were determined, discussed and interpreted.