Characterization and Luminescence Properties of Lanthanide-Based Polynuclear Complexes Nanoaggregates

Francois Le Natur , Guillaume Calvez (1) , Jean-Paul Guégan (1) , Laurent Le Polles (1) , Xavier Trivelli (2) , Kevin Bernot (1) , Carole Daiguebonne (1) , Chrystelle Neaime (1) , Karine Costuas (1) , Fabien Grasset (1, 3) , Olivier Guillou (1)

1 ISCR - Institut des Sciences Chimiques de Rennes
2 UGSF - Unité de Glycobiologie Structurale et Fonctionnelle UMR 8576
3 LINK - Laboratory for Innovative Key Materials and Structures

For the first time, hexanuclear complexes with general chem. formula [Ln6O(OH)8(NO3)6(H2O)n]2+ with n = 12 for Ln = Sm-Lu and Y and n = 14 for Ln = Pr and Nd were stabilized as nanoaggregates in ethylene glycol (EG). These unprecedented nanoaggregates were structurally characterized by 89Y and 1H NMR spectroscopy, UV-vis absorption and luminescence spectroscopies, electrospray ionization mass spectrometry, diffusion ordered spectroscopy, transmission electron microscopy, and dynamic light scattering. These nanoaggregates present a 200 nm mean solvodynamic diam. In these nanoaggregates, hexanuclear complexes are isolated and solvated by EG mols. The replacement of ethylene glycol by 2-hydroxybenzyl alc. provides new nanoaggregates that present an antenna effect toward lanthanide ions. This results in a significant enhancement of the luminescence properties of the aggregates and demonstrates the suitability of the strategy for obtaining highly tunable luminescent solns.

Domains: Chemical Sciences

Francois Le Natur, Guillaume Calvez, Jean-Paul Guégan, Laurent Le Polles, Xavier Trivelli, et al.. Characterization and Luminescence Properties of Lanthanide-Based Polynuclear Complexes Nanoaggregates. Inorganic Chemistry, 2015, 54 (12), pp.6043-6054. ⟨10.1021/acs.inorgchem.5b00947⟩. ⟨hal-01162339⟩