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.