Abstract
The slow rate of oxidation of molecular bromine by cobalt(III) ions is first order in both [CoIII] and [Br2], and the bimolecular rate constant is inversely proportional to [H+]2. This is interpreted as the reaction of a hydrolysed dimer of CoIII with Br2, and the latter is converted into the bromate condition. At high acidity this slow reaction is followed by a very rapid oxidation initiated by the reaction of the hydroxyl radical with bromine. Evidence exists for the formation of a complex between CoIII and Br2: the variation of optical density with [CoIII], [Br2], and [HClO4] suggests a 1 : 1 complex between unhydrolysed dimer and molecular bromine.
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