Abstract

Originally, three aromatic anil Schiff bases were synthesized by reactions of salicylaldehyde with o-,m- and p-phenylene diamine by a standard method, in the presence of azeotrope forming solvent. Two syn and anti isomeric Schiff bases having yellow and orange colors were separated by fractional recrystalization in ethanol, when primary aromatic amine used having o and p-phenylene diamine structures. Mean while m-phenylene diamine gave a single yellow anti isomeric compound.

The main aim of the study was the determination of structures for these five syn and anti Schiff base isomers by the available physical methods. These were performed by using melting points, UV-IR spectra and pKa values for these amphiprotic substances. Results collected in this investigation were interpreted and discussed by proper scientific way depending on experimental data collected.

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