Intramolecular charge transfer in 1:1 Cu(II)/pyrenylcyclam dendrimer complexes

Two newly synthesized pyrenylcyclam dendrons have displayed unique emissive blue shifts centered at 450 nm upon adding copper triflate, which are attributed to intramolecular excimer emission. Metal complexation and intramolecular photoinduced electron transfer within the dendritic 1:1 cyclam/metal complex have played vital roles in the photophysical properties in metal/dendrimer complexes.