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13 C NMR Studies of the Redox Reactions of Autothiomalate and Bis(Thiomalato)Gold(I) With Selenocyanate in an Aqueous Solution

Metal-Based Drugs
Hindawi Publishing Corporation
Publication Date
DOI: 10.1155/mbd.1994.513
  • Research Article


13C NMR STUDIES OF THE REDOX REACTIONS OF AUTOTHIOMALATE AND BIS(THIOMALATO)GOLD(I) WITH SELENOCYANATE IN AN AQUEOUS SOLUTION Avarhusein A. Isab, M. Naseem Akhtar and Abdul Rahman AI-Arfaj Department of Chemistry, King Fahd University of Petroleum and Minerals, Dharan 31261, Saudi Arabia Avarhusein A. Isab, M. Naseem Akhtar and Abdul Rahman AI-Arfaj Department of Chemistry King Fahd University of Petroleum and Minerals Dhahran 31261, Saudi Arabia The interactions of SCN- with aurothiomalate (AuStm) in aqueous solution were studied by 13C NMR spectroscopy. The AuStm remains polymerized in the presence of SCN-, however, SeCN- binds to AuStm forming the NCSe-Au-Stm- complex. This complex initially disproportionates to give Au(SeCN)2- and Au(Stm)2-. The Au(SeCN)2- specie eventually decomposes to give metallic gold and metallic selenium (or selenium anion). The free tmS- which is released from AuStm with excess SeCN- is oxidized to thiomalic disulfide (tmS2). The bis complex Au(Stm)2 was generated in aqueous solution and then reacted with SeCN-. Since Au(I) is blocked by both sides, SeCN- did not form tmS-Au-SeCN- species. Instead, it gave selenium metal and Au(CN)2 In the present studies we have demonstrated that SeCN- reacts differently with mono- and bis- (thiomalato)gold (I). 513

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