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Synthesis and binding studies of a novel highly selective Ag(I) ligand.pdf (753.13 kB)
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Synthesis and Binding Studies of a Novel Highly Selective Ag(I) Ligand

preprint
submitted on 10.03.2020 and posted on 11.03.2020 by Abiodun Aderibigbe, Andrew J. Clark
Ligands bearing S- and N- donors are an important class of extractants with demonstrated efficiency and selectivity for Ag+ extraction over metals with similar chemistries. However, the synthesis of some of these ligands can be complicated and low yielding. Here, we report the synthesis of a novel ligand - N-(2-((4-vinylbenzyl)thio)ethyl)acetamide, over two simple steps and in a good yield. The extractant was observed to demonstrate excellent selectivity for Ag+, extracting only Ag+ from an aqueous solution also containing Cu2+ and Pb2+. Moderate extraction efficiencies of 36 % for Ag+ and 0% each for Cu2+ and Pb2+ were observed. From mass spectrometry and proton NMR titration data, the extractant was found to form both the 1:1 and 1:2 (Ag+:ligand) complexes with Ag+ indicating that ligand forms bent linear and tetrahedral coordination complexes with Ag+. Overall, the results indicate that the novel amide-based ligand is highly selective for Ag+ removal from aqueous solutions containing Cu2+ and Pb2+. These results indicate the ligand could be easily synthesized and applied for selective silver recovery from low grade ores.

History

Email Address of Submitting Author

a.aderibigbe.1@warwick.ac.uk

Institution

University of Warwick

Country

United Kingdom

ORCID For Submitting Author

0000-0003-2379-669X

Declaration of Conflict of Interest

The authors declare no conflict of interest

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