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Chemistry and Biomimetics Group, CSIR-Central Mechanical Engineering Research Institute, MG Avenue, Durgapur-713209, India
; Fax: +91-343-2546745
; Tel: +91-343-2546828
Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Egerlandstrasse 1, 91058 Erlangen, Germany
; Fax: +49-9131-8527387
; Tel: +49-9131-8528383
Dalton Trans., 2013,42, 4725-4729
16 Nov 2012,
10 Jan 2013
First published online
30 Jan 2013
Reported here is the first example of a ruthenium complex, [RuIII(edta)(H2O)]− (edta4− = ethylenediaminetetraacetate), that catalyzes the oxidation of thiourea (TU) in the presence of H2O2. The kinetics and mechanism of this reaction were investigated in detail by using rapid-scan spectrophotometry as a function of both the hydrogen peroxide and thiourea concentrations at pH 4.9 and 25 °C. Spectral analyses and kinetic data clearly support a catalytic process in which hydrogen peroxide reacts directly with thiourea coordinated to the RuIII(edta) complex. HPLC product analyses revealed the formation of formamidine disulfide (TU2) as a major product at the end of the catalytic process, however, formation of other products like thiourea dioxide (TUO2), thiourea dioxide (TUO3) and sulfate was also observed after longer reaction times. Catalytic intermediates such as [RuIII(edta)(OOH)]2− and [RuV(edta)(O)]− were evidently found to be non-reactive in catalyzing the oxidation of thiourea by H2O2 under the specified conditions.
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