Alternatively, excitation of the pd •-ligand has different results depending on Ln coordinated. In 3-YbEu, energy transfer to Yb 3+ in the O,Oʹ binding site occurs (pathway II in Figure ). However, there is no efficient route for energy transfer to Dy 3+ from pd •-, making this pathway unviable in 3-DyYb. Instead, in 3-DyYb excitation of pd •- results in energy transfer to Yb 3+ in the N,Nʹ binding site (pathway III in Figure ). These complex and directional energy transfer pathways provide further evidence for selective coordination to N,Nʹ and O,Oʹ coordination sites.