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Kinetics and mechanism of oxidation of N,N-bis(salicylaldehyde-1,2-diaminoethane) cobalt(II) by N-bromosuccinimide in aqueous acidic medium

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Abstract

The kinetics of oxidation of N,N-bis(salicylaldehyde-1,2-diaminoethane) cobalt(II) complex by N-bromosuccinimide (NBS) in aqueous acid and H2O–MeOH solvent mixtures were studied spectrophotometrically over the 20–40 °C range, 0.1–0.5 mol dm−3 ionic strength, 2.2–2.8 pH range and 0–40 wt% MeOH–H2O solvent mixtures for a range of NBS and complex concentrations. The rate shows first-order dependence on both [NBS] and [complex] and decreases with pH over the range studied. The protonated form of N-bromosuccinimide was identified as the main reactive species. An inner-sphere mechanism involving free radicals is proposed.

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Authors and Affiliations

  1. Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Sinai University, Areesh City, Cairo, Egypt

    Alaa Eldin Mokhtar Abdel-Hady

  2. Faculty of Science, Chemistry Department, Azhar University, Cairo, Egypt

    Rabie S. Farag & Ahmad S. Abu-Khadra

Authors
  1. Alaa Eldin Mokhtar Abdel-Hady
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  2. Rabie S. Farag
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  3. Ahmad S. Abu-Khadra
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Corresponding author

Correspondence to Alaa Eldin Mokhtar Abdel-Hady.

Additional information

Rabie S. Farag and Ahmad S. Abu-Khadra—abstracted from M. Sc. Thesis of Ahmad S. Abu-Khadra.

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Abdel-Hady, A.E.M., Farag, R.S. & Abu-Khadra, A.S. Kinetics and mechanism of oxidation of N,N-bis(salicylaldehyde-1,2-diaminoethane) cobalt(II) by N-bromosuccinimide in aqueous acidic medium. Transition Met Chem 35, 571–576 (2010). https://doi.org/10.1007/s11243-010-9365-y

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  • DOI: https://doi.org/10.1007/s11243-010-9365-y

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