Pyridinethiol-Assisted Dissolution of Elemental Gold in Organic Solutions

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http://hdl.handle.net/10138/324826

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Räisänen , M , Heliövaara , E , Al-Qaisi , F , Muuronen , M , Eronen , A , Liljeqvist , H , Nieger , M , Kemell , M , Moslova , K , Hämäläinen , J , Lagerblom , K & Repo , T 2018 , ' Pyridinethiol-Assisted Dissolution of Elemental Gold in Organic Solutions ' , Angewandte Chemie (International Edition) , vol. 57 , no. 52 , pp. 17104-17109 . https://doi.org/10.1002/anie.201810447

Title: Pyridinethiol-Assisted Dissolution of Elemental Gold in Organic Solutions
Author: Räisänen, Minna; Heliövaara, Eeva; Al-Qaisi, Feda'a; Muuronen, Mikko; Eronen, Aleksi; Liljeqvist, Henri; Nieger, Martin; Kemell, Marianna; Moslova, Karina; Hämäläinen, Jani; Lagerblom, Kalle; Repo, Timo
Contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, University of California
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2018-12-21
Language: eng
Number of pages: 6
Belongs to series: Angewandte Chemie (International Edition)
ISSN: 1433-7851
URI: http://hdl.handle.net/10138/324826
Abstract: Dissolution of elemental gold in organic solutions is a contemporary approach to lower the environmental burden associated with gold recycling. Herein, we describe fundamental studies on a highly efficient method for the dissolution of elemental Au that is based on DMF solutions containing pyridine-4-thiol (4-PSH) as a reactive ligand and hydrogen peroxide as an oxidant. Dissolution of Au proceeds through several elementary steps: isomerization of 4-PSH to pyridine-4-thione (4-PS), coordination with Au-0, and then oxidation of the Au-0 thione species to Au-I simultaneously with oxidation of free pyridine thione to elemental sulfur and further to sulfuric acid. The final dissolution product is a Au-I complex bearing two 4-PS ligands and SO42- as a counterion. The ligand is crucial as it assists the oxidation process and stabilizes and solubilizes the formed Au cations.
Subject: desulfurization
gold
gold recycling
pyridinethiol
reaction mechanisms
SELECTIVE RECOVERY
POWERFUL REAGENTS
OXIDATION
116 Chemical sciences
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