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Kinetics of oxidation of N,N-bis(salicylaldehyde-1,2-diaminoethane) cobalt(II) complex by periodate. Evidence for the inhibiting effect of copper(II)

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Abstract

A kinetic study of the oxidation of [Co(H2L)(H2O)2]2+ (H2L = N,N-bis (salicylaldehyde-1,2-diaminoethane) Schiff base) by periodate in aqueous solution was performed over pH (2.3–3.4) range, (0.1–0.5) mol dm−3 ionic strength and temperatures 20–35 °C for a range of periodate and complex concentrations. The reaction rate showed a first-order dependence on both reactants and increased with pH over the range studied. The effects of Cu(II) and Fe(II) on the reaction rate were investigated over the (1.0–9.0) × 10−5 mol dm−3 range. The reaction was inhibited as the concentration of Cu(II) increased, and it was independent on Fe(II) concentrations over the ranges studied. An inner-sphere mechanism is proposed for the oxidation pathways of both the protonated and deprotonated CoII complex species.

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  1. Faculty of Pharmacy, Sinai University, Arish City, Cairo, Egypt

    Alaa Eldin M. Abdel-Hady

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  1. Alaa Eldin M. Abdel-Hady
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Correspondence to Alaa Eldin M. Abdel-Hady.

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Abdel-Hady, A.E.M. Kinetics of oxidation of N,N-bis(salicylaldehyde-1,2-diaminoethane) cobalt(II) complex by periodate. Evidence for the inhibiting effect of copper(II). Transition Met Chem 33, 873–878 (2008). https://doi.org/10.1007/s11243-008-9126-3

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  • DOI: https://doi.org/10.1007/s11243-008-9126-3

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