Kinetic studies of the oxidation of chromium(III) by N-bromosuccinimide |
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| Authors: | Ahmed A Abdel-Khalek Alaa E -D M Abdel-Hady Mohamed F El-Shahat |
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| Institution: | (1) Chemistry Department, Faculty of Science, Cairo University, Beni-Suef Branch, Beni-Suef, Egypt;(2) Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, Cairo, Egypt |
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| Abstract: | Summary A kinetic study of the oxidation of chromium(III) by N-bromosuccinimide (NBS) in aqueous solutions and H2O-MeOH solvent mixtures were performed. The kinetics in aqueous solutions obeyed the rate law: dCrVI]/dt = {k
4
K
h
K
2NBS]CrIII]T}/+]{1 + K
h/H+] + (K
1 + K
h
K
2/H+]NBS])} where K
h, K
1 and K
2 are the hydrolysis constant of CrIII(H2O)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
of cobalt(II) and chromium(III) complexes including Cr(H2O)6]3+ is presented in support of a common mechanism for these reactions.
Abstracted from the Ph.D. Thesis (Ain Shams University) of A. E.-D. M. Abdel-Hady. |
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| Keywords: | |
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