The formation of dinuclear trichloro-bridged and mononuclear ruthenium complexes from the reactions of dichlorotris(p-tolylphosphine)ruthenium(II) with diazabutadiene ligands

Ru(II) complexes with diazabutadiene (R-DAB) ligands have been prepared. The reaction of RuCl(3)nH(2)O with P(p-tolyl)(3) gave a [RuCl2{P(p-tolyl)(3)}] precursor, whose reactions with R-DAB in toluene gave dinuclear trichloro-bridged Ru(II) complexes [Ru2Cl3(P(p-tolyl)(3))(2)(R-DAB)(2)](BF4) which have been characterized by spectroscopic methods. In addition, one of the complexes was characterized using X-ray crystallography. Meanwhile, two mononuclear Ru(II) complexes [RuCl2(P(p-tolyl)(3))(2)(R-DAB)] were obtained from the reactions of the [RuCl2{P(p-tolyl)(3)}] precursor with R-DAB ligands in THF. The two trans-mononuclear complexes were characterized by X-ray crystallography and solid-state P-31 NMR. A temperature-dependent P-31 NMR study was carried out to monitor the formation of dinuclear and mononuclear complexes.