The oxidation of carbohydrazide by the 12-tungstocobaltate(III) ion in acidic medium: Kinetics and mechanism

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Abstract

The redox reaction between the 12-tungstocobaltate(III) ion and carbohydrazide is first order with respect to both the oxidant and the substrate. The observed pseudo first-order rate constant, kobs, is retarded by increasing the concentrations of H+and alkali metal ion (Li+, Na+and K+). There is a linear correlation between the kobsand the concentrations of carbohydrazide and H+ion, but the plots of kobsagainst the concentrations of the alkali metal ions is non-linear. However, the same data is applicable to the Davies equation for the effect of the ionic strength on the kobs. Complex formation between the 12-tungstocobaltate(III) ion and carbohydrazide is indicated by optical density measurements, which increased with increasing H+concentration in the reaction mixture. This indicated that+H3NNHCONHNH2probably formed a complex with the 12-tungstocobaltate(III) ion. A suitable mechanism involving deprotonation of the complex and subsequent decomposition of the deprotonated complex as the rate limiting step is suggested. © 2008 Elsevier Ltd. All rights reserved.

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Mehrotra, M., & Mehrotra, R. N. (2008). The oxidation of carbohydrazide by the 12-tungstocobaltate(III) ion in acidic medium: Kinetics and mechanism. Polyhedron, 27(8), 1989–1994. https://doi.org/10.1016/j.poly.2008.03.011

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