STUDIES ON GOLD(II) COMPLEXES WITH HARD AND SOFT DONOR LIGANDS .2. COMPLEXES WITH ORTHO-(METHYLTHIO)ANILINE AND 1,2-BIS((ORTHO-AMINOPHENYL)THIO)ETHANE

The synthesis and properties of gold(II) complexes with omicron-(methylthio)aniline (Hmta) and 1,2-bis((omicron-aminophenyl)thio)ethane (dae) are reported. omicron-(Methylthio)aniline forms both mononuclear and binuclear complexes depending on the preparative conditions. The isomeric pair of monomeric gold(II) complexes [Au(mta)2Cl]Cl (1a,b), both of which give a four-line EPR multiplet in CH2Cl2 solution, undergo dimerization in DMF leading to the formation of [Au(mta)2Cl]2Cl2 (1c), which exhibits a well-resolved seven-line EPR pattern possibly originating from two Au-197 nuclei. The corresponding dimeric bromo (1d) and thiocyanato (1e) complexes also exhibit similar EPR profiles. A temperature-dependent susceptibility measurement indicates that the two spins are ferromagnetically coupled within the dimer, while a weak antiferromagnetic coupling exists between the dimers. The cyclic voltammetric results are in line with EPR results.