Oxidative addition of functional disulfides to platinum(II): Formation of chelating and bridging thiolate–carboxylate complexes of platinum(IV)

McCready, Matthew S.; Puddephatt, Richard J.

doi:10.1016/j.inoche.2010.10.024

Cited by 15 publications

(6 citation statements)

References 16 publications

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“…The formation of Pt(IV)-S species in the next stages can be explained by oxidation of the Pt(II)-S by di-and polysulfide groups as reported in refs [57,58]. The oxidative capability of the -S-S-species arising at the sulfide mineral surfaces upon their prolonged oxidation seems to be in fact mediated by Fe(III) entities and oxygen.…”

Section: Discussionmentioning

confidence: 73%

X-ray Photoelectron Spectroscopy (XPS) Study of the Products Formed on Sulfide Minerals Upon the Interaction with Aqueous Platinum (IV) Chloride Complexes

2018

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The interaction of aqueous solutions bearing platinum-group elements (PGEs) with sulfides is important for understanding the formation and weathering of PGE ore deposits, mineral processing, and synthesis of nanomaterials. Here, the surface species formed upon the contact of the main sulfide minerals (pyrite, pyrrhotite, galena, chalcopyrite and valleriite) with the solutions of H 2 PtCl 6 (pH 1.5, 20 • C) have been studied using X-ray photoelectron spectroscopy (XPS). Uptake of Pt increased gradually with increasing interaction time, and depended, as well as the composition of immobilized products, on the mineral nature and the state of its surface, e.g., the chemical pre-treatment. The highest rate of Pt deposition was observed on galena and valleriite and the lowest on pyrite and pyrrhotite. The preliminary moderate oxidation of pyrrhotite promoted Pt deposition, which, however, was hindered under harsh reaction conditions. The pre-oxidation of pyrite in all cases resulted in a decrease of the Pt deposition. Initially, Pt(IV) chloride complexes adsorb onto the mineral surface, and then the reduction of Pt(IV) to Pt(II) and substitution of chloride ions with sulfide groups occur forming sulfides of Pt(II) and then, Pt(IV). The reduction of Pt species to the metallic state was observed at valleriite after 24 h, probably due the negative charge of the sulfide nanolayers of this sulfide-hydroxide composite mineral.

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Section: Discussionmentioning

confidence: 73%

X-ray Photoelectron Spectroscopy (XPS) Study of the Products Formed on Sulfide Minerals Upon the Interaction with Aqueous Platinum (IV) Chloride Complexes

2018

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“…The interaction of platinum(II) with disulfides involves different mechanisms. They are complexation with the formation of polynuclear disulfide complexes [3,4], disproportionation with the formation of thiol complexes of platinum(II) [5][6][7] and oxidative addition with the formation of thiol complexes of platinum(IV) [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Interaction of Pt(II) and Au(III) with organic disulfides in hydrochloric aqueous solution

Петров

Novikova

Demina

et al. 2019

Journal of Coordination Chemistry

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The interaction of Pt(II) and Au(III) with disulfides (L-cystine, cystamine, DL-homocystine and 3,3'-dithiodipropionic acid) in hydrochloric acid aqueous solutions was studied. In the case of Pt(II), the oxidative addition reaction leads to the formation of the Pt(IV) thiol complex. In the case of Au(III) disulfide binding causes a reduction to Au(0) and oxidation of the disulfide to sulfonic acid. Cyclic voltammetry and different spectroscopic methods were used to study the process. The pattern of influence of the metallic properties for d 8 ions in the direction of the reaction was found.

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“…Considering the RSSR/RSH status in the presence of Pt(II), in addition to the reaction (1), the following reaction is of particular interest [33][34][35][36][37][38][39][40][41]:…”

Section: Resultsmentioning

confidence: 99%

Platinum(II)‐mediated disulfide/thiolate interconversion in organic disulfides: Density functional theory thermodynamic study

Петров

Dergachev

2021

Int J of Quantum Chemistry

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We present a complete Density Functional Theory (DFT) study of the thermodynamics of the reactions of disulfides (L-cystine, cystamine, DL-homocystine, and 3,3 0dithiodipropionic acid) with Pt(II) ions in aqueous media. SMD solvation model was fitted to take into account the solvation effects of the medium. DFT calculations predict the oxidative addition reaction with the formation of thiolate complexes of Pt(IV)-[PtCl 4 (S-R) 2 ] which is consistent with experimental data. We propose a theoretical model that rationalizes the experimental data on Pt(II) interactions with homological disulfides. The role of explicit solvation in reactions is also investigated. We propose that the stability of S,S 0 -binuclear disulfide complexes correlates with the redistribution of charges on sulfur atoms. We compared MN15 and PBE0 functionals for the calculation of equilibrium constants.

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Oxidative addition of functional disulfides to platinum(II): Formation of chelating and bridging thiolate–carboxylate complexes of platinum(IV)

Cited by 15 publications

References 16 publications

X-ray Photoelectron Spectroscopy (XPS) Study of the Products Formed on Sulfide Minerals Upon the Interaction with Aqueous Platinum (IV) Chloride Complexes

X-ray Photoelectron Spectroscopy (XPS) Study of the Products Formed on Sulfide Minerals Upon the Interaction with Aqueous Platinum (IV) Chloride Complexes

Interaction of Pt(II) and Au(III) with organic disulfides in hydrochloric aqueous solution

Platinum(II)‐mediated disulfide/thiolate interconversion in organic disulfides: Density functional theory thermodynamic study

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