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Kinetics of the oxidation of [N-(2-hydroxyethyl)-ethylene-diamine-N,N′,N′-triacetato]cobalt(II) byN-bromosuccinimide

✍ Scribed by Ahmed A. Abdel-Khalek; Mohamed M. Khalil; Eman S. H. Khaled

Publisher
Springer
Year
1993
Tongue
English
Weight
428 KB
Volume
18
Category
Article
ISSN
0340-4285

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✦ Synopsis

The kinetics of the oxidation of [N-(2-hydroxyethyl)ethylene-diamine-N,N',N'-triacetato] cobalt(II),

[Co n-(HEDTA)]-, by N-bromosuccinimide, NBS, have been studied in aqueous solutions and water-methanol solvent mixtures under various conditions. The reaction stoichiometry indicates that one mole of NBS reacts with one mole of [Co"(HEDTA)]-. In aqueous solutions the reaction obeys the following rate law:

An inner sphere mechanism is proposed for pathway oxidation of both the protonated and deprotonated species of the complex, with the formation of an intermediate which slowly forms the final oxidation product, [Com(HEDTA)]. In water-methanol solvent mixtures the reaction rate decreased as the methanol content was increased. An appropriate mechanism, consistent with the kinetic results, is suggested.

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