Thiophene Based Europium β-Diketonate Complexes: Effect of the Ligand Structure on the Emission Quantum Yield

被引：154

作者：

Freund, Christelle ^{[1
]}

Porzio, William ^{[1
]}

Giovanella, Umberto ^{[1
]}

Vignali, Francesco ^{[1
]}

Pasini, Mariacecilia ^{[1
]}

Destri, Silvia ^{[1
]}

Mech, Agnieszka ^{[2
]}

Di Pietro, Sebastian ^{[3
]}

Di Bari, Lorenzo ^{[3
]}

Mineo, Placido ^{[4
]}

机构：

[1] CNR, Ist Studio Macromol, I-20133 Milan, Italy

[2] Univ Milano Bicocca, Dipartimento Sci Mat, I-20125 Milan, Italy

[3] Univ Pisa, Dipartimento Chim & Chim Ind, I-56126 Pisa, Italy

[4] Univ Catania, Dipartimento Sci Chim, I-95125 Catania, Italy

来源：

INORGANIC CHEMISTRY | 2011年 / 50卷 / 12期

关键词：

LANTHANIDE COMPLEXES; ENERGY-TRANSFER; EXCITED-STATES; EU(III); DESIGN; LUMINESCENCE; FLUORESCENCE; POLYMER; EU3+;

D O I：

10.1021/ic1021164

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

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 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.

引用

页码：5417 / 5429

页数：13

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