Pyridinethiol-Assisted Dissolution of Elemental Gold in Organic Solutions

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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 .

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 organization: Department of Chemistry
Timo Repo / Principal Investigator
Date: 2018-12-21
Language: eng
Number of pages: 6
Belongs to series: Angewandte Chemie (International Edition)
ISSN: 1433-7851
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 recycling
reaction mechanisms
116 Chemical sciences
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: acceptedVersion

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