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

The paper includes the preparation of eight Schiff bases , derived for
salicylaldehyde and o-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.