title: Thiophene based europium β-diketonate complexes: effect of the ligand structure on the emission quantum yield.
abstract: The synthesis and the molecular and photophysical characterization, together with solid state and solution structure analysis, of a series of europium complexes based on β-diketonate ligands are reported. The Eu(III) complex emission, specifically its photoluminescence quantum yield (PL-QY), can be tuned by changing ligands which finely modifies the environment of the metal ion. Steady-state and time-resolved emission spectroscopy and overall PL-QY measurements are reported and related to geometrical features observed in crystal structures of some selected compounds. Moreover, paramagnetic NMR, based on the analogous complexes with other lanthanides, are use to demonstrate that there is a significant structural reorganization upon dissolution, which justifies the observed differences in the emission properties between solid and solution states. The energy of the triplet levels of the ligands and the occurrence of nonradiative deactivation processes clearly account for the luminescence efficiencies of the complexes in the series.
authors: Istituto per lo Studio delle Macromolecole-CNR, Via E. Bassini 15, 20133 Milano, Italy.
authors: Christelle
authors: C
authors: Freund
authors: William
authors: W
authors: Porzio
authors: Umberto
authors: U
authors: Giovanella
authors: Francesco
authors: F
authors: Vignali
authors: Mariacecilia
authors: M
authors: Pasini
authors: Silvia
authors: S
authors: Destri
authors: Agnieszka
authors: A
authors: Mech
authors: Sebastiano
authors: S
authors: Di Pietro
authors: Lorenzo
authors: L
authors: Di Bari
authors: Placido
authors: P
authors: Mineo