Palladium(II) inhibition during cerium(IV) oxidation of aldoses: a kinetic study |
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Authors: | Manjari Gupta Santosh K Upadhyay |
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Institution: | (1) Department of Chemistry, HB Technological Institute, 208 002 Kanpur, India |
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Abstract: | Summary The kinetics of oxidation of aldoses, namely xylose, arabinose, galactose and glucose, by CeIV have been studied in HClO4 + H2SO4 medium and in the presence of PdII. The reactions exhibit a first order rate dependence with respect to oxidant. The rate is inversely dependent on the HSO
inf4
sup–
] H+] ratio. The order of reaction with respect to aldose decreases at higher aldose]. Due to the formation of a complex between CeIV and PdII, a retarding effect of PdII] on the rate of disappearance of CeIV] has been observed. A mechanism consistent with the observed kinetic data is proposed. |
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