10.1021/ja045706y.s001 Jason P. Cross Jason P. Cross Miriam Lauz Miriam Lauz Paul D. Badger Paul D. Badger Stéphane Petoud Stéphane Petoud Polymetallic Lanthanide Complexes with PAMAM-Naphthalimide Dendritic Ligands:  Luminescent Lanthanide Complexes Formed in Solution American Chemical Society 2004 Polymetallic Lanthanide Complexes dendritic structure luminescence batch titration Solution Generation 3 PAMAM dendrimers functionalized coordination number metal cation dendrimer structure end branches complex emission dendrimer solution formation nonradiative deactivation lanthanide cations luminescence properties 354 nm UV light lanthanide luminescence Eu Luminescence lifetimes lanthanide metal cation 2004-12-22 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Polymetallic_Lanthanide_Complexes_with_PAMAM_Naphthalimide_Dendritic_Ligands_Luminescent_Lanthanide_Complexes_Formed_in_Solution/3311218 Generation 3 PAMAM dendrimers functionalized with 2,3-naphthalimide chromophoric groups on the end branches were synthesized, and the formation of Eu<sup>3+</sup> polymetallic complexes was investigated. The luminescence properties of these complexes upon binding were fully characterized. On addition of Eu<sup>3+</sup> to the dendrimer solution, lanthanide luminescence appears. The formation of a luminescent species corresponding to a dendrimer:lanthanide ratio of 1:8 was determined by luminescence batch titration and indicated by the maximum of Eu<sup>3+</sup> emission. This indicates an overall average coordination number of 7.5 around each lanthanide metal cation. This is the first report of such characterization in the literature. Luminescence lifetimes indicate that the metal cation is well protected from nonradiative deactivation by the dendritic structure. Despite the limited efficiency of the sensitization of Eu<sup>3+</sup>, the absolute quantum yield being 0.0006, the good protection of the eight lanthanide cations bound in the dendrimer structure and the high absorptivity leads to the red emission from Eu<sup>3+</sup> that is easily observed in solution under irradiation with 354 nm UV light.