Kinetic studies of the oxidation of chromium(III) byN-bromosuccinimide

✍ Scribed by Ahmed A. Abdel-Khalek; Alaa E. -D. M. Abdel-Hady; Mohamed F. El-Shahat

• Publisher: Springer
• Year: 1994
• Tongue: English
• Weight: 360 KB
• Volume: 19
• Category: Article
• ISSN: 0340-4285
• DOI: 10.1007/bf00161882

✦ Synopsis

N-Bromosuccinimide oxidation of Cr m 169 of the oxidation of chromium(III) by N-bromo-Summary A kinetic study of the oxidation of chromium(III) by N-bromosuccinimide (NBS) in aqueous solutions and H20-MeOH solvent mixtures were performed. The kinetics in aqueous solutions obeyed the rate law: d[CrVl]/dt = {k4KhK2[NBS] [CrI"]T}/ [H+]{I + Kh/[H+]+(KI + KhKz/[H+][NBS]}

where Kh, K1 and K2 are the hydrolysis constant of [Crm(HzO)6] 3 +, and pre-equilibrium formation constants for the protonated and deprotonated precursor complexes, respectively. An innersphere mechanism is proposed. An argument based on isokinetic correlations among activation parameters for the oxidation of a series ofeobalt(II) and chromium(III) complexes including [Cr(HzO)6] 3+ is presented in support of a common mechanism for these reactions.