| Abstract: | The reactions of bidentate diimine ligands (L2) with binuclear Ru(L1)(CO)Cl2]2 complexes L1 not equal to L2 = 2,2'-bipyridine (bpy), 4,4'-dimethyl-2,2'-bipyridine (4,4'-Me2bpy), 5,5'-dimethyl-2,2'-bipyridine (5,5'-Me2bpy), 1,10-phenanthroline (phen), 4,7-dimethyl-1,10-phenanthroline (4,7-Me2phen), 5,6-dimethyl-1,10-phenanthroline (5,6-Me2phen), di(2-pyridyl)ketone (dpk), di(2-pyridyl)amine (dpa)] result in cleavage of the dichloride bridge and the formation of cationic Ru(L1)(L2)(CO)Cl]+ complexes. In addition to spectroscopic characterization, the structures of the Ru(bpy)(phen)(CO)Cl]+, Ru(4,4'-Me2bpy)(5,6-Me2phen)(CO)Cl]+ (as two polymorphs), Ru(4,4'-Me2bpy)(4,7-Me2phen)(CO)Cl]+, Ru(bpy)(dpa)(CO)Cl]+, Ru(5,5'-Me2bpy)(dpa)(CO)Cl]+, Ru(bpy)(dpk)(CO)Cl]+, and Ru(4,4'-Me2bpy)(dpk)(CO)Cl]+ cations were confirmed by single crystal X-ray diffraction studies. In each case, the structurally characterized complex had the carbonyl ligand trans to a nitrogen from the incoming diimine ligand, these complexes corresponding to the main isomers isolated from the reaction mixtures. The synthesis of Ru(4,4'-Me2bpy)(5,6-Me2bpy)(CO)(NO3)]+ from Ru(4,4'-Me2bpy)(5,6-Me2bpy)(CO)Cl]+ and AgNO3 demonstrates that exchange of the chloro ligand can be achieved. |
