Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 9, Issue 10, Pages 2814-2825Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201402385
Keywords
chromophores; lanthanides; luminescence; magnetic properties; sulfur-containing heterocycles
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Funding
- CNRS, Rennes Metropole, Universite de Rennes 1, Region Bretagne
- Fonds Europeen de Developpement Economique et Regional (FEDER)
- Agence Nationale de la Recherche [ANR-13-BS07-0022-01]
- GENCI-CINES center [2012-80649]
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Ligand L was synthesized and then coordinated to [Ln(hfac)(3)]2H(2)O (Ln(III)=Tb, Dy, Er; hfac(-)=1,1,1,5,5,5-hexafluoroacetylacetonate anion) and [Ln(tta)(3)]2H(2)O (Ln(III)=Eu, Gd, Tb, Dy, Er, Yb; tta(-)=2-thenoyltrifluoroacetonate) to give two families of dinuclear complexes [Ln(2)(hfac)(6)(L)]C6H14 and [Ln(2)(tta)(6)(L)]2CH(2)Cl(2). Irradiation of the ligand at 37040cm(-1) and 29410cm(-1) leads to tetrathiafulvalene-centered and 2,6-di(pyrazol-1-yl)-4-pyridine-centered fluorescence, respectively. The ligand acts as an organic chromophore for the sensitization of the infrared Er-III (6535cm(-1)) and Yb-III (10200cm(-1)) luminescence. The energies of the singlet and triplet states of L are high enough to guarantee an efficient sensitization of the visible Eu-III luminescence (17300-14100cm(-1)). The Eu-III luminescence decay can be nicely fitted by a monoexponential function that allows a lifetime estimation of (0.490.01)ms. Finally, the magnetic and luminescence properties of [Yb-2(hfac)(6)(L)]C6H14 were correlated, which allowed the determination of the crystal field splitting of the F-2(7/2) multiplet state with M-J=+/- 1/2 as ground states.
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