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Kinetic investigation of hydroxide ion and DNA attack on some high spin iron (II) chelates Bearing ONO Donors amino acid Schiff bases

Laila H. Abdel-Rahman, Rafat M. El-Khatib, Lobna A. E. Nassr, Ahmed M. Abu-Dief

Abstract


The reactivity of few novel high spin Fe(II) complexes of Schiff base ligands derived from 2-hydroxynaphthaldehyde and some variety of amino acids with OH- ion has been examined in aqueous mixture at temperature in the range 10–40 Co. Based on the kinetic investigations, the rate law and a plausible mechanism were proposed and discussed. The general rate equation was suggested as follows: rate = kobs [Complex], where kobs.= k1 + k2 [OH-]. Base catalyzed hydrolysis kinetics measurements imply pseudo-first-order doubly stage rates due the presence of merand
fac-isomers. The observed rate constants kobs are correlated the effect of substituent R in the structure of the ligands.From the effect of temperature on the rate; various thermodynamic parameters have been evaluated. The evaluated rate constants and activation parameters are in a good agreement with the stability constants of the investigated complexes.

Keywords: Base catalyzed hydrolysis, Isomer, Reaction mechanism, Thermodynamic parameters.


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