Synthesis, Crystal Structure,
and Luminescent Properties
of 2-(2,2,2-Trifluoroethyl)-1-indone Lanthanide Complexes
- Publication date
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Abstract
A new β-diketone, 2-(2,2,2-trifluoroethyl)-1-indone
(TFI),
which contains a trifluorinated alkyl group and a rigid indone group,
has been designed and employed for the synthesis of two series of
new TFI lanthanide complexes with a general formula [Ln(TFI)<sub>3</sub>L] [Ln = Eu, L = (H<sub>2</sub>O)<sub>2</sub> (<b>1</b>), bpy
(<b>2</b>), and phen (<b>3</b>); Ln = Sm, L = (H<sub>2</sub>O)<sub>2</sub> (<b>4</b>), bpy (<b>5</b>), and phen (<b>6</b>); bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline].
X-ray crystallographic analysis reveals that complexes <b>1</b>–<b>6</b> are mononuclear, with the central Ln<sup>3+</sup> ion eight-coordinated by six oxygen atoms furnished by three TFI
ligands and two O/N atoms from ancillary ligand(s). The room-temperature
photoluminescence (PL) spectra of complexes <b>1</b>–<b>6</b> show strong characteristic emissions of the corresponding
Eu<sup>3+</sup> and Sm<sup>3+</sup> ions, and the substitution of
the solvent molecules by bidentate nitrogen ligands essentially enhances
the luminescence quantum yields and lifetimes of the complexes
