Reaction of [Ru^III(EDTA)(H₂O/OH)]^−/2− with bisulfide and persulfide in aqueous solution: kinetic and mechanistic studies

Maria OszajcaFaculty of Chemistry, Jagiellonian University, Kraków, Poland;

Debabrata ChatterjeeVice-Chancellor’s Research Group at Zoology Department, University of Burdwan, Burdwan, India; ;Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany; Correspondence[email protected]

http://orcid.org/0000-0001-5849-3571

Rudi van EldikFaculty of Chemistry, Jagiellonian University, Kraków, Poland; ;Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany; ;Faculty of Chemistry, N. Copernicus University, Torun, Poland

Abstract

The reaction of [Ru^III(EDTA)(H₂O/OH)]⁻^/2⁻ (EDTA⁴⁻ = ethylenediaminetetraacetate) with bisulfide (HS⁻) and persulfide (HSS⁻) leading to the formation of a dinuclear disulfur-bridged [(EDTA)Ru^IIISSRu^III(EDTA)]⁴⁻ product has been studied spectrophotometrically. Kinetics of the reaction of [Ru^III(EDTA)(H₂O/OH)]⁻^/2⁻ with HS⁻ was studied in aqueous solution as a function of [HS^-] at a constant pH of 8.2 (phosphate buffer) and temperature (20 °C). Formation of the product complex, [(EDTA)Ru^IIISSRu^III(EDTA)]⁴⁻, in the reaction of [Ru^III(EDTA)(H₂O/OH)]⁻^/2⁻ with HSS⁻ was identified by ESI-MS studies. A working mechanism in agreement with the spectroscopic and kinetic data is presented.

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Acknowledgements

M.O. acknowledges financial support from the National Science Centre (Grant no. DEC-2016/23/D/ST4/00303).

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No potential conflict of interest was reported by the authors.

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Reaction of [Ru^III(EDTA)(H₂O/OH)]^−/2− with bisulfide and persulfide in aqueous solution: kinetic and mechanistic studies

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Reaction of [RuIII(EDTA)(H2O/OH)]−/2− with bisulfide and persulfide in aqueous solution: kinetic and mechanistic studies

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Reaction of [Ru^III(EDTA)(H₂O/OH)]^−/2− with bisulfide and persulfide in aqueous solution: kinetic and mechanistic studies