Kinetics of acid-catalyzed hydrolysis of some high-spin Fe(II) Schiff base amino acid
complexes were followed spectrophotometrically at 298 K under pseudo–first-order conditions.
The studied ligands were derived from the condensation of 5-bromosalicylaldehyde with different
four amino acids (phenylalanine, aspartic acid, histidine, and arginine). The acid hydrolysis
reaction was studied in aqueous media and in the presence of different concentrations of the
alkali halide (KBr) and cationic surfactant (cetyl-trimethyl ammonium bromide, CTAB). The
general rate equation was suggested to be rate = kobs[complex], where kobs = k2[H+]. The increase
in [KBr] enhances the reactivity of the reaction, and the addition of CTAB to the reaction
mixture accelerates the reaction reactivity. The obtained kinetic data were used to determine
the values of δmG# (the change in the activation barrier) for the studied complexes when
transferred from “water to water containing different [KBr]” and from “water to water containing