Substitution of [RuCl2 (CO) 3 (THF)],[RuCl2 (dmso) 4] and [RuCl2 (PPh3) 3] with a macrocyclic ligand, 2, 3, 4, 5, 6, 7, 8, 9-octahydro-1, 9-diphenyl-1H-5, 1, 9- benzazadiphosphacyclo undecine (11-P2NH), provided [Ru (11-P2NH) Cl2 (CO)](3),[Ru (11- P2NH) Cl2 (dmso)](4) and [Ru (11-P2NH) Cl2 (CH3CN)](5), respectively. These complexes were characterized by elemental analyses as well as NMR spectroscopy. The structure of ...