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Thiophene Based Europium beta-Diketonate Complexes: Effect of the Ligand Structure on the Emission Quantum Yield (Articolo in rivista)

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Thiophene Based Europium beta-Diketonate Complexes: Effect of the Ligand Structure on the Emission Quantum Yield (Articolo in rivista) (literal)

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Alternative label

Freund C., Porzio W., Giovanella U., Vignali F., Pasini M., Destri S., Mech A., Di Pietro S., Di Bari L., Mineo P. (2011)
Thiophene Based Europium beta-Diketonate Complexes: Effect of the Ligand Structure on the Emission Quantum Yield
in Inorganic chemistry; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
(literal)

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Freund C., Porzio W., Giovanella U., Vignali F., Pasini M., Destri S., Mech A., Di Pietro S., Di Bari L., Mineo P. (literal)

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Freund C., Porzio W., Giovanella U., Vignali F., Pasini M., Destri S. - Istituto per lo Studio delle Macromolecole-CNR, Via E. Bassini 15, 20133 Milano, Italy, Mech A. - Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, Via R. Cozzi 53, 20125 Milano, Italy, Di Pietro S., Di Bari L.- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy, Mineo P. - Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125 Catania, Italy. (literal)

Titolo

Thiophene Based Europium beta-Diketonate Complexes: Effect of the Ligand Structure on the Emission Quantum Yield (literal)

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 beta-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 PLQY 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. (literal)

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