POLYNUCLEAR COMPLEXES OF TRIS(BIPYRIDINE) BRIDGING LIGANDS - ENERGY-TRANSFER FROM RU-BASED TO OS-BASED COMPONENTS

The following complexes of the tris(bipyridine) ligand 1, 1,3,5-tris[(((2,2'-bipyridyl-5'-yl)carbonyl)benzylamino)methyl]benzene, have been prepared: 1[Ru(bpy)2]2+, 1[Ru(bpy)2]2(4+), 1[Ru(bpy)2]3(6+), 1[Os(bpy)2]3(6+), and 1[Ru(bpy)2]2[Os(bpy)2]6+. Their absorption spectra and luminescence properties have been investigated. Luminescence intensity and lifetime measurements show that in the mixed-metal complex 1[Ru(bpy)2]2[Os(bpy)2]6+ efficient energy transfer takes place from the Ru-based components to the Os-based one.