Abstract
ABSTRACT. The kinetics and mechanistic steps to the electron transfer reaction of the peroxo-bridged binuclear cobalt(III) complex of succinimide [(suc)(en)2Co(O2)Co(en)2(suc)2+] hereafter called peroxo-bridged dicobalt(III) complex ‘[Co(O2)Co2+]’ by glycine have been carried out spectrophotometrically at λ = 420 nm and T = 26 ± 1 oC, [H+] = 1 x 10-3 M and ᶙ = 0.5 M (NaCl) in aqueous acidic medium. The reaction was found to be first order with respect to [Co(O2)Co2+] and [(Gly] and experimental data indicates a second-order overall. The reactions obeyed the general rate law: (d[Co(O2)Co2+]/dt) = (a +b)[H+])[Co(O2)Co2+][Gly]. Varying hydrogen ion concentration accelerated the reaction rate and shows first-order dependence while the reactions also affected by changes in the ionic strength of the reaction medium by giving a non-negative salt effect in the course of the reaction. Free radicals were not detected in the reactions. Spectroscopic investigation and Michaelis-Menten plots suggest the absence of intermediate complex formation. The experimental result obtained in this system is concluded in favor of the outer-sphere mechanism.
 
 KEY WORDS: Cobalt(III) complex, Kinetic, Electron transfer, Spectroscopic, Mechanistic steps, Michaelis-Menten, Glycine
 
 Bull. Chem. Soc. Ethiop. 2021, 35(2), 425-434.
 DOI: https://dx.doi.org/10.4314/bcse.v35i2.15
Highlights
The inorganic mechanistic study is relevance across coordination chemistry, organometallic synthetic chemistry, and the biochemical role of metals
Iron(III)–1,10-phenanthroline complex with glycine kinetics and mechanism data studied in the presence of aqueous perchloric acid medium showed unity order to iron(III) and glycine, respectively [9]
The kinetics and mechanistic steps to the electron transfer reaction of peroxo-bridged binuclear cobalt(III) complex of succinimide have been studied in aqueous acidic media spectrophotometrically at λ = 420 nm
Summary
The inorganic mechanistic study is relevance across coordination chemistry, organometallic synthetic chemistry, and the biochemical role of metals. Iron(III)–1,10-phenanthroline complex with glycine kinetics and mechanism data studied in the presence of aqueous perchloric acid medium showed unity order to iron(III) and glycine, respectively [9]. Hydrogen ion concentrations ([H+]) on the rate of reaction was studied by varying concentrations of HCl from 1.0 to 1.4 x 10-3 M for [Gly]/[Co(O2)Co2+] system, while the concentration of glycine, ionic strength, dicobalt(III) complex and temperature were kept constant [12].
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