Author： Sulfab Yousif
Publisher： Springer Publishing Company
ISSN： 0340-4285
Source： Transition Metal Chemistry, Vol.29, Iss.2, 2004-03, pp. : 216-220
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Abstract
The kinetics of oxidation of cis‐[CrIII(ox)2(H2O)2]− (ox = C2O42−) by IO4− showed a first‐order dependence on the initial CrIII complex concentration in the presence of a vast excess of [IO4−]. The dependence of the pseudo‐first‐order rate constant on [IO4−] is complex and is consistent with the formation of a precursor complex. It is proposed that this complex is formed through the coordination of the two carbonyl oxygens of the ox ligand with the IO4− ion, forming a cyclic intermediate. The kinetics are consistent with the hydroxo form of the CrIII complex being the reactive species, whereas the aqua species forms an unreactive complex.
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