Síntese, caracterização e estudo biológico de compostos de rutênio, platina, paládio e ouro com o ligante dicloridrato de N,N’-bis (tiofenil-2-metil) etano-1,2-diamina

Abstract

The present work, syntheses and characterizations of the ligand N,N’-bis(tiophenyl-2methyl)ethane-1,2-diamino dichlorydrate (BNHred.2HCl), their [RuCl2BNHred(PPh3)2], [PtCl2BNHred] and [PdCl2BNHred] complexes and their [BNHred.2H+][PtCl4] and [BNHred.2H+][Au(CN)2]2- salts were described. The compounds were analyzed by elementare analysis (C, H and N), IR, Raman and NMR (in solution and solid state) spectroscopies as well by powder X ray diffraction and DFT calculations. The [PtCl2BNHred] and [PdCl2BNHred] complexes should be square planar geometry since ligand is coordinated by nitrogen atoms of the NH groups and the coordination sphere is completed by two chlorine ions. The octahedral [RuCl2BNHred(PPh3)2] complex structure was determined/refined by powder X ray diffraction where the Ru(II) ion is coordinated by ligand in chelate mode, also by two PPh3 molecules and by two chloride ions. The [BNHred.2H+][PtCl4] and [BNHred.2H+][Au(CN)2]2- salt structures were also solved by powder X ray diffraction. [BNHred.2H+][Au(CN)2]2- salt crystallizes in orthorhombic system and space group Pnn2, while the [BNHred.2H+][PtCl4] salt belongs to triclinic system and space group P-1. In addition, the ligand N,N’-bis(tiophenyl-2-methyl)ethane-1,2-diamino dinitrate (BNHred.2HNO3) was also synthetized and fully characterized. The BNHred.2HNO3 structure was obtained by powder X ray diffraction and presents a monoclinic crystalline system and space group P21/c. Biological tests against Mycobacterium tuberculosis of all the obtained compounds have been carried out, where the [BNHred.2H+][Au(CN)2]2- salt has been shown MIC90 at 2.31 mg/L.