68079-91-4Relevant academic research and scientific papers
Ru(EDTA) mediated partial reduction of O2 by H2S
Chatterjee, Debabrata,Jaiswal, Namita,Sarkar, Papiya
, p. 7613 - 7617 (2015)
An effective procedure for selective reduction of O2 to H2O2 exploring the use of hydrogen sulfide, an obnoxious industrial pollutant as reductant is reported herein. The reduction of [RuIII(EDTA)pz]- (EDTA4- = ethylenediaminetetraacetate; pz = pyrazine) by hydrogen sulfide resulting in the formation of a red [RuII(EDTA)pz]2- complex (λmax = 462 nm) has been studied spectrophotometrically and kinetically using both rapid scan and stopped-flow techniques. The time course of the reaction was followed as a function of [HS-]i, pH (5.5-8.5), and temperature. Alkali metal ions were found to have a positive influence (K+ > Na+ > Li+) on the reaction rate. Kinetic data and activation parameters are interpreted in terms of a mechanism (admittedly speculative) involving outer-sphere electron transfer between the reaction partners. Reaction of the red [RuII(EDTA)pz]2- complex with molecular oxygen regenerates the [RuIII(EDTA)pz]- species in the reacting system along with the formation of H2O2, a partially reduced product of dioxygen (O2) reduction. A detailed reaction mechanism in agreement with the spectral and kinetic data is presented.
