Potentiometric study for Determination of values for Schiff bases derived from 2- acetyl pyridine with heterocyclic amines

Abstract

Abstract The project was started by synthesis of two Schiff bases from 2- acetyl pyridine with 4- amino pyrimidine and 4- amino pyridine by a standard method . The structures of these Schiff bases had confirmed by physical method , namely by using U.V-IR spectra and melting points . The main aims of the study was the determination of two consecutive nitrilium ions ionization constants pK1 and pK2 for in each molecule simultaneously . The last was regarded an improvement in potentiometric method for determination of pKa in these molecules . Finaly factors govern , the pK1 or pK2 values in these Schiff base ,as structure of imines, temperature and mixed solvent of ethanol in the range (10_60) % in water were given and discussed.