title: Characterization and Luminescence Properties of Lanthanide-Based Polynuclear Complexes Nanoaggregates.
abstract: For the first time, hexanuclear complexes with general chemical 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 (89)Y and (1)H 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 diameter. In these nanoaggregates, hexanuclear complexes are isolated and solvated by EG molecules. The replacement of ethylene glycol by 2-hydroxybenzyl alcohol 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 solutions.
authors.forename: François
authors.initials: F
authors.lastname: Le Natur
authors.forename: Guillaume
authors.initials: G
authors.lastname: Calvez
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Guégan
authors.forename: Laurent
authors.initials: L
authors.lastname: Le Pollès
authors.affiliation: ∥Université Lille 1-Sciences et Technologies, UMR CNRS 8576 UGSF, IFR 147-FRE 3637, F-59655 Villeneuve d'Ascq, France.
authors.forename: Xavier
authors.initials: X
authors.lastname: Trivelli
authors.forename: Kevin
authors.initials: K
authors.lastname: Bernot
authors.forename: Carole
authors.initials: C
authors.lastname: Daiguebonne
authors.forename: Chrystelle
authors.initials: C
authors.lastname: Neaime
authors.forename: Karine
authors.initials: K
authors.lastname: Costuas
authors.forename: Fabien
authors.initials: F
authors.lastname: Grasset
authors.forename: Olivier
authors.initials: O
authors.lastname: Guillou