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Updated: May 11, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Oxidation of thiocyanate with H2O2 catalyzed by [Ru(III)(edta)(H2O)]-
Debabrata Chatterjee1, Barnali Paul, Rupa Mukherjee
1Chemistry and Biomimetics Group, CSIR-Central Mechanical Engineering Research Institute, MG Avenue, Durgapur, 713209, India. dchat57@hotmail.com
Abstract:
The [Ru(III)(edta)(H2O)](-) (edta(4-) = ethylenediaminetetraacetate) complex is shown to catalyze the oxidation of thiocyanate (SCN(-)) with H2O2 mimicking the action of peroxidases. The kinetics of the catalytic oxidation process was studied by using stopped-flow and rapid scan spectrophotometry as a function of [Ru(III)(edta)], [H2O2], [SCN(-)], pH (3.2-9.1) and temperature (15-30 °C). Spectral analyses and kinetic data are suggestive of a catalytic pathway in which hydrogen peroxide reacts directly with thiocyanate coordinated to the Ru(III)(edta) complex. Catalytic intermediates such as [Ru(III)(edta)(OOH)](2-) and [Ru(V)(edta)(O)](-) were found to be non-reactive in the oxidation process under the specified conditions. Formation of SO4(2-) and OCN(-) was identified as oxidation products in ESI-MS experiments. A detailed mechanism in agreement with the spectral and kinetic data is presented.
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