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