Syntheses, characterization, and structures of three ruthenium complexes containing two monodentate dppm ligands

Three cis-Ru(dppm)(2)XY complexes (XY = C2O4, 1; X = Cl, Y = N-3, 2; X= Y= N-3, 3) were prepared by reactions of cis-Ru(dppm)(2)Cl-2 with (NH4)(2)C2O4, a mixture of NaN3 and NaPF6, and only NaN3, respectively, while 3 could also be obtained from further reaction of 2 with NaN3 undergoing a facile chloride abstraction. All complexes have been characterized by IR, NMR, UV-vis, and luminescence spectroscopic analyses as well as X-ray diffraction studies. Of these structures, 1 shows oxalate coordinates to Ru as a chelating ligand, while 2 displays Ru and azide linear, and 3 gives two azide groups cis to each other, which are different from two substituting ligands commonly lying in trans positions in Ru(P-P)(2) complexes by using cis-Ru(dppm)(2)Cl-2 as a precursor.