期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 27, 期 34, 页码 8668-8672出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202101028
关键词
gold; gold dissolution; ligand exchange; reaction mechanisms; S ligands
资金
- Fortum and Neste Foundation [20200066]
The development of new, environmentally benign dissolution methods for metallic gold is driven by needs in the circular economy. A quantitative dissolution of gold in organic solution under mild conditions is achieved by using hydrogen peroxide as an oxidant and two thiol ligands working in a cooperative manner. This ligand-exchange mechanism allows to drastically reduce thiol consumption and may lead to more effective gold dissolution methods in the future.
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.
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