Kinetics and mechanism of oxidation of the ternary complex of cobalt(II) involving N-(2-acetamido) iminodiacetic acid and malonate by periodate in acetate medium Full Paper ICAIJ, 5(2), 2010 [83-88] Inorganic CHEMISTRY

Hassan Ewais, Mohamed Shehata, Mohammed Nagdy, Ahmed Abdel-Khalek, An Journal
2010 unpublished
The kinetics of the oxidation of [Co II (ADA)(M)(H 2 O) 2 ] 2-(ADA = N-(2-acetamido)iminodiacetic and M = Malonate) by periodate in acetate medium have been investigated spectrophotometrically at 580 nm under pseudo first order condition by taking large excess of oxidant (IO 4-) over the 15.0-35.0C range at pH = 4.99 and I = 0.50 M. The kinetics in acetate medium obeyed the rate law: d[Co III ]/dt = (k 2 + k 3 [CH 3 CO 2-])[Co II (ADA)(M)(H 2 O) 2 ] 2-[IO 4-]. The initial cobalt(III) products
more » ... balt(III) products were formed and slowly converted to final products , fitting an inner-sphere mechanism. The enthalpy and the entropy of the activation were measured using the transition state theory equation. 