[a] 1 - Eu(CPDK3­5)3Bpy17-17; 2 - Eu(CPDK3­5)3Phen; 3 - Eu(CPDK5-Th)3Bpy17-17; 4 - Eu(CPDK5­Th)3Phen; 5 - Eu(CPDK3-Ph)3Phen; 6 - Eu(DK12-14)3Bpy17-17.