期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 25, 期 69, 页码 15944-15956出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201904320
关键词
lanthanides; long lived emission; NIR emission; quenching
资金
- FWO (Research Foundation Flanders)
- European Union's Horizon 2020 programme
- Ghent University Special Research Fund (BOF) [BOF15/24J/049]
- Hercules Foundation [AUGE/11/029]
- Special Research Fund (BOF)-UGent [01N03217]
Two series of novel NIR-emissive complexes of Nd3+, Sm3+, Er3+ and Yb3+ with two different beta-diketonate ligands (L-1=4,4,4-trifluoro-1-phenyl-1,3-butadione and L-2=4,4,4-trifluoro-1-(4-chlorophenyl)-1,3-butadione) are reported. The neutral triphenylphosphine oxide (tppo) ligand was used to replace coordinated water molecules in the first coordination sphere of the as-obtained [Ln(L-1(2))(3)(H2O)(2)] complexes to afford water-free [Ln(L-1(2))(3)(tppo)(2)] molecular species. Upon replacement of water molecules by tppo units, the NIR emission lifetimes of the Nd3+, Er(3+)and Sm(3+)complexes increase by about one order of magnitude up to values of approximate to 9, 8 and 113 ms while Yb3+ complexes reach intrinsic quantum yields as high as to phi(Yb)=6.5 %., which are remarkably high for fully hydrogenated complexes. Vibrational quenching by CH and OH oscillators has been quantitatively assessed by implementing the Forster's model of resonance energy transfer on the basis of experimental data. This study demonstrates that highly efficient NIR-emitting lanthanide complexes can be obtained with facile, cheap and accessible syntheses through a rational design.
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