BINDING OF GOLD(III) USING BISMUTH HEXAMETHYLENEDITHIOCARBAMATE: THE DOUBLE COMPLEXES OF [Au(SCNHm)][Bi(SCNHm)Cl] AND [Au(SCNHm)][Bi(SCNHm)Cl] (PREPARATION, CRYSTAL STRUCTURE, THERMAL BEHAVIOR AND ANTI-MYCOBACTERIAL ACTIVITY)

It was established that during the interaction of bismuth hexamethylenedithiocarbamate (HmDtc) with a H[AuCl]/2M HCl solution, the individual forms of gold(III) binding in the solid phase are double complexes of [Au(SCNHm)][Bi(SCNHm)Cl] (I) and [Au(SCNHm)][Bi(SCNHm)Cl] (II). The structures of the obtained compounds include centrosymmetric/non-centrosymmetric (in I/II) complex cations of Au(III), as well as heteroleptic bismuth anions: both the mononuclear and binuclear, whose the ratio Bi : Dtc : Cl = 1:2:2/2:2:6 (I/II). The secondary S~S and S~Cl interactions that arise between these ionic structural units lead to the formation of three-dimensional supramolecular architectures. In the IR spectra of the compounds, the absorption bands of N–C(S)S bonds were assigned to HmDtc ligands in the inner sphere of Au(III) complex cations and Bi(III) anions. Thermal behavior of I and II was studied using the STA technique. The residual substance obtained after thermolysis of the samples is represented by metallic particles of a solid solution of bismuth in gold, coated with a layer of BiO. For complex I, a high level of anti-mycobacterial activity in vitro was revealed against the non-pathogenic strain Mycolicibacterium smegmatis.