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Synthesis and characterization of trisodium salt of bis(thiosalicylato)aurate(I): Na3[Au(TSA)2]·5H2O

1995; Elsevier BV; Volume: 60; Issue: 4 Linguagem: Inglês

10.1016/0162-0134(95)00028-3

1873-3344

Kenji Nomiya, Hironari Yokoyama, Hitomi Nagano, M. Oda, Sadatoshi Sakuma,

Crystal structures of chemical compounds

Sodium salt of a water-soluble, anionic, and monomeric 1:2 complex of Au(I) with a dianion of thiosalicylic acid TSA2−(Hin2TSA) = o-HS(C6H4)COOH) was first prepared and isolated as colorless needle crystals through a stoichiometric reaction of NaAuCl4:H2TSA:NaOH = 1:4:8 molar ratio in aqueous/EtOH solution. In this reaction, TSA2− ligand has played a role of a reducing agent for the starting Au(III) ion and also of donor ligands coordinating to the reduced Au(I). This compound was characterized by complete elemental analyses, TG/DTA, FT-IR, 2D-NMR (1H-1H COSY, 1H-13C HMBC, and 1H-13C HMQC) spectroscopy, and the molmass measurement based on the cryoscopic method. It was shown that this complex was a monomeric species of Au(I) with a formula of Na3[Au(TSA)2]·5H2O in the solid state, but not a polymeric species even in aqueous solution. A full assignment of seven carbon and four proton resonances in the coordinated TSA2− ligand was achieved by the 2D 1H-13C HMBC NMR technique.