Intermolecular Energy-Transfer Dynamics in {(delta)-[Ru(bpy)3]}{(lambda)-[Os(bpy)3]}(PF6)4 and rac-[Os(bpy)3] (PF6)2 Crystals

In the crystal composed of (delta)-[Ru(bpy)3]2+ and (lambda)-[Os(bpy)3]2+ complexes which were pseudo enantiomers the photoexcitation energy was effectively transferred from [Ru(bpy)3]2+ to [Os(pby)3]2+ (kET > 1.1 × 108 s-1). In rac-[Os(bpy)3](PF6)2 crystal the energy-transfer rates from (lambda)-[Os(bpy)3]2+ to (lambda)-[Os(bpy)3]2+ and from (lambda)-[Os(bpy)3]2+ to (delta)-[Os(bpy)3]2+ were estimated as k = 1.8 × 106 s-1 and k// = 7.9 × 105 s-1, respectively.