Ligands bearing soft donors including N- and S- have found applications in selective metal recovery due to the ability to preferentially bind soft acceptors like Ag+. Herein, N-(2-((4-vinylbenzyl)thio)ethyl)acetamide (L) bearing potential Ag+-selective N- and S-donors was prepared in a 76% yield under mild conditions. Reaction of L with silver perchlorate and silver nitrate gave complexes 1 and 2, as pastes, in yields of 98 and 77%, respectively. Physico-chemical and spectroscopic characterizations confirmed the chemical compositions of L, 1 and 2. ESI–MS data indicated that 1 and 2 each contain both the [AgL]+ and [AgL2]+ types complexes. Binding studies carried out by Job plot and 1H NMR titration using silver perchlorate indicated that L interacts with Ag+ to form the [AgL]+ type complex and that the N- and S-donors may be responsible for binding Ag+. Finally, L was observed to demonstrate excellent selectivity and moderate efficiency (36%) for Ag+ extraction from an aqueous solution also containing Cu2+ and Pb2+.

中文翻译：

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N,S-供体乙酰胺配体：银 (I) 结合和测试银 (I) 提取研究

由于能够优先结合软受体（如 Ag+），带有包括 N- 和 S- 在内的软供体的配体已在选择性金属回收中得到应用。在此，在温和条件下以 76% 的产率制备了带有潜在 Ag+ 选择性 N-和 S-供体的 N-（2-（（4-乙烯基苄基）硫代）乙基）乙酰胺（L）。L 与高氯酸银和硝酸银反应得到复合物 1 和 2，呈糊状，产率分别为 98% 和 77%。物理化学和光谱表征证实了 L、1 和 2 的化学成分。ESI-MS 数据表明 1 和 2 均包含 [AgL]+ 和 [AgL2]+ 类型的复合物。Job plot 和使用高氯酸银的 1H NMR 滴定进行的结合研究表明，L 与 Ag+ 相互作用形成 [AgL]+ 型复合物，并且 N-和 S-供体可能负责结合 Ag+。最后，观察到 L 对从还含有 Cu2+ 和 Pb2+ 的水溶液中提取 Ag+ 表现出出色的选择性和中等效率 (36%)。