Pyridinethiol-Assisted Dissolution of Elemental Gold in Organic Solutions
Pyridinethiol-Assisted Dissolution of Elemental Gold in Organic Solutions
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DOI：
10.1002/anie.201810447
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发表时间：
2018-12-21
影响因子：
16.6
通讯作者：
Repo, Timo
中科院分区：
文献类型：
--
作者：
Raisanen, Minna;Heliovaara, Eeva;Repo, Timo
在有机溶液中溶解元素金是降低与金回收相关的环境负担的当代方法。在此，我们描述了对元素Au溶解的高效方法的基础研究，该方法基于含有吡啶-4-硫醇（4-PSH）作为反应性配体和过氧化氢作为氧化剂的DMF溶液。Au的溶解通过几个基本步骤进行：4-PSH异构化为吡啶-4-硫（4-PS），与Au-0配位，然后将Au-0配位物质氧化为Au-I，同时将游离吡啶硫氧化为元素硫并进一步氧化为硫酸。最终的溶解产物是带有两个4-PS配体和SO 42-作为抗衡离子的Au-I配合物。配体是至关重要的，因为它有助于氧化过程并稳定和溶解所形成的Au阳离子。
Dissolution of elemental gold in organic solutions is a contemporary approach to lower the environmental burden associated with gold recycling. Herein, we describe fundamental studies on a highly efficient method for the dissolution of elemental Au that is based on DMF solutions containing pyridine-4-thiol (4-PSH) as a reactive ligand and hydrogen peroxide as an oxidant. Dissolution of Au proceeds through several elementary steps: isomerization of 4-PSH to pyridine-4-thione (4-PS), coordination with Au-0, and then oxidation of the Au-0 thione species to Au-I simultaneously with oxidation of free pyridine thione to elemental sulfur and further to sulfuric acid. The final dissolution product is a Au-I complex bearing two 4-PS ligands and SO42- as a counterion. The ligand is crucial as it assists the oxidation process and stabilizes and solubilizes the formed Au cations.