Kinetics and mechanism of oxidation of ferrocyanide by N-bromosuccinimide in aqueous acidic solution |
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Authors: | Alaa Eldin M Abdel-Hady |
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Institution: | (1) Faculty of Pharmacy, Sinai University, Arish City, Cairo, Egypt |
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Abstract: | The kinetics of oxidation of ferrocyanide by N-bromosuccinimide (NBS) has been studied spectrophotometrically in aqueous acidic medium over temperature range 20–35 °C,
pH = 2.8–4.3, and ionic strength = 0.10–0.50 mol dm−3 over a range of Fe2+] and NBS]. The reaction exhibited first order dependence on both reactants and increased with increasing pH, NBS], and
Fe2+]. The rate of oxidation obeys the rate law: dFe3+]/dt = Fe(CN)6]4–HNBS+]/(k
2 + k
3/H+]). An outer-sphere mechanism has been proposed for the oxidation pathway of both protonated and deprotonated ferrocyanide
species. Addition of both succinimide and mercuric acetate to the reaction mixture has no effect on the reaction rate under
the experimental conditions. Mercuric acetate was added to the reaction mixture to act as scavenger for any bromide formed
to ensure that the oxidation is entirely due to NBS oxidation. |
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Keywords: | |
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