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The oxalic acid catalysed oxidation of bis(2,4,6-tripyridyl-1,3,5-triazine)-iron(II) by chromium(VI) in acetate buffer

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Summary

The reaction between bis(2,4,6-tripyridyl-1,3,5-triazine)-iron(II), Fe(TPTZ) sup2+inf2 and chromium(VI) in acetate buffers is very slow. However, in the presence of oxalic acid (catalyst) it is very fast and is completed within 10s. The reaction was studied in the 3.6–5.6 pH range using stopped-flow spectrophotometry. The reaction is first order in the substrate and zero order in the oxidant. The rate of the reaction increases with the increase in pH. Kinetic evidence for complexation between the substrate and the catalyst was obtained and a mechanism involving the formation of an ion-pair between Fe(TPTZ) sup2+inf2 and the oxalate ion is proposed.

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Satyanarayana, T., Anipindi, N.R., Subbiah, V. et al. The oxalic acid catalysed oxidation of bis(2,4,6-tripyridyl-1,3,5-triazine)-iron(II) by chromium(VI) in acetate buffer. Transition Met Chem 18, 93–95 (1993). https://doi.org/10.1007/BF00136060

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  • DOI: https://doi.org/10.1007/BF00136060

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