13C NMR STUDIES OF THE REDOX REACTIONS OF AUTOTHIOMALATE AND BIS(THIOMALATO)GOLD(I) WITH SELENOCYANATE IN AN AQUEOUS SOLUTION
Redox Reactions of Gold Compounds with Selenocyanate
publication
Author Information
Author(s): Avarhusein A. Isab, M. Naseem Akhtar, Abdul Rahman AI-Arfaj
Primary Institution: King Fahd University of Petroleum and Minerals
Hypothesis
How do selenocyanate and thiomalate gold(I) interact in aqueous solution?
Conclusion
Selenocyanate reacts differently with mono- and bis-thiomalato gold(I), leading to the formation of metallic gold and selenium.
Supporting Evidence
- The AuStm remains polymerized in the presence of SCN-.
- SeCN- binds to AuStm forming the NCSe-Au-Stm- complex.
- The complex disproportionates to give Au(SeCN)2- and Au(Stm)2-.
- Au(SeCN)2- decomposes to give metallic gold and metallic selenium.
- Free tmS- is oxidized to thiomalic disulfide (tmS2).
- Au(Stm)2 reacts with SeCN- to produce selenium metal and Au(CN)2.
Takeaway
This study shows that a chemical called selenocyanate behaves differently when it meets two types of gold compounds in water, making gold and selenium.
Methodology
The interactions were studied using 13C NMR spectroscopy.
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