Cooperative Ligands in Dissolution of Gold

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Heliövaara , E , Liljeqvist , H , Muuronen , M , Eronen , A , Moslova , K & Repo , T 2021 , ' Cooperative Ligands in Dissolution of Gold ' , Chemistry: A European Journal , vol. 27 , no. 34 , pp. 8668-8672 .

Title: Cooperative Ligands in Dissolution of Gold
Author: Heliövaara, Eeva; Liljeqvist, Henri; Muuronen, Mikko; Eronen, Aleksi; Moslova, Karina; Repo, Timo
Contributor organization: Department of Chemistry
Date: 2021-06-16
Language: eng
Number of pages: 5
Belongs to series: Chemistry: A European Journal
ISSN: 0947-6539
Abstract: Development of new, environmentally benign dissolution methods for metallic gold is driven by needs in the circular economy. Gold is widely used in consumer electronics, but sustainable and selective dissolution methods for Au are scarce. Herein, we describe a quantitative dissolution of gold in organic solution under mild conditions by using hydrogen peroxide as an oxidant. In the dissolution reaction, two thiol ligands, pyridine-4-thiol and 2-mercaptobenzimidazole, work in a cooperative manner. The mechanistic investigations suggest that two pyridine-4-thiol molecules form a complex with Au-0 that can be oxidized, whereas the role of inexpensive 2-mercaptobenzimidazole is to stabilize the formed Au-I species through a ligand exchange process. Under optimized conditions, the reaction proceeds vigorously and gold dissolves quantitatively in two hours. The demonstrated ligand-exchange mechanism with two thiols allows to drastically reduce the thiol consumption and may lead to even more effective gold dissolution methods in the future.
Subject: gold
gold dissolution
ligand exchange
reaction mechanisms
S ligands
116 Chemical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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