The UV and ir spectra of some schiff bases derived from salicylaldehyde and o-methoxybenzaldehyde : study the influence of concentration of schiff base on tautomerism reaction process

Abstract EN

The paper includes the preparation of eight Schiff bases, derived for salicylaldehyde and methoxybenzaldehyde with aromatic amines such as o, m, pamino aniline and o, m, p-phenylene diamine by standard method.

The ratio of aldehyde to amine during synthesis of imines are either 1:1 or 2:1 respectively .The last ratio gives a new class of di-salicylidene anilines of limited publications is known on them till now.

The presence of hydrogen bondings in imines, are identified by using UV and IR spectra.

The study led to a conclusion that imines under investigation, are exist as an equilibrium mixtures of enol and keto forms in 1, 2- dichloro ethane.

The mechanisms of tautomerism reactions of imines are included.

Finally, the influence of concentrations of Schiff bases on tautomerism process, namely on equilibrium constants values and ΔG thermodynamic parameter are given.