Kinetics and mechanism of oxidation of (ethylenediaminediacetato)chromium(III) by N-bromosuccinimide

Authors
Abdel-Khalek, AA Khaled, ESH
Citation
Aa. Abdel-khalek et Esh. Khaled, Kinetics and mechanism of oxidation of (ethylenediaminediacetato)chromium(III) by N-bromosuccinimide, TRANSIT MET, 24(2), 1999, pp. 189-192
Citations number
15
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
TRANSITION METAL CHEMISTRY
ISSN journal
03404285 → ACNP
Volume
24
Issue
2
Year of publication
1999
Pages
189 - 192
Database
ISI
SICI code
0340-4285(199904)24:2<189:KAMOOO>2.0.ZU;2-H
Abstract
The kinetics of oxidation of (ethylenediaminediacetato)chromium(III), [Cr(E DDA)(OH2)(2)](+), by N-bromosuccinimide (NBS) in aqueous solution to yield Cr-VI have been studied spectrophotometrically over the 20-40 degrees C ran ge. The reaction rate is first order with respect to both [NBS] and [Cr-III ], and increases with pH over the range 4.8-5.8. The activation parameters were calculated. A mechanism in which deprotonated [Cr-III(EDDA)(OH2)(OH)] is the reactive species is suggested. The electron transfer may proceed via an inner sphere mechanism through bridging of the two reactants by the hyd roxo ligand.