Thermodynamic study on tautomerism reaction of phenolic Schiff base. A comparative tautomerism study in solution And gaseous states

Abstract

The study deals with the tautomerism reaction of type enol keto in
benzylidene-o-hydroxyaniline (I), beside the thermodynamic study of such reaction in
solution state. The results show the enol content in molecule (I) is predominant as
evident from the positive value of average ΔG function of value 4.4 kJ.mole-1.
Moreover, others calculated ΔH and ΔS parameters have an average negative values of
about -1.1 kJ.mole-1 and -18.0 J.mole-1.K-1 respectively, these support the tautomerism
reaction.
Finally a comparative study between the tautomerism constant values in solution
and gaseous states for the reaction stated above, is given