Study of some factors affecting imine oxime tautomerism by electronic spectra

Abstract

A general study about tautomerism was done on imine-oxime contained phenolic group
(OH) in position 2,3 and 4 on aromatic ring by using electronic spectra in ethanol, the study
included some factors affected on tautomerism such as acidity of solution used the water as
solvent instead of ethanol and temperature, since evaluated thermodynamic parameters (ΔG,
ΔH, ΔS) for tautomerism, the study lead to extance the affect of phenolic group on aromatic
ring in addition to solvent. The effect of increase temperature lead to decrease of the
equilibrium constant value for tautomerism process and changed to irreversible and change
the (enol imine) form to (keto imine) form associated with liberation energy with different of
enthalpy of (keto imine) form.