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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Authors: | Alaa Eldin Mokhtar Abdel-Hady Rabie S Farag Ahmad S Abu-Khadra |
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Institution: | 1. Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Sinai University, Areesh City, Cairo, Egypt 2. Faculty of Science, Chemistry Department, Azhar University, Cairo, Egypt
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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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