期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 21, 期 49, 页码 17921-17932出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201501816
关键词
aromatic carboxylates; fluorobenzoates; lanthanides; luminescence; near-IR; structure elucidation
资金
- Baden-Wurttemberg state through the exchange research ZOIV program
- Helmholtz program Biointerface
- Deutsche Forschungsgemeinschaft [SFB/TRR 88, GRK 2039]
- Russian Scientific Foundation [14-23-00176]
- Russian Foundation for Basic Research [13-03-12453, 14-03-32052]
- Russian Science Foundation [14-23-00176] Funding Source: Russian Science Foundation
Highly luminescent, photostable, and soluble lanthanide pentafluorobenzoates have been synthesized and thoroughly characterized, with a focus on Eu-III and Tb-III complexes as visible emitters and Nd-III, Er-III, and Yb-III complexes as infrared emitters. Investigation of the crystal structures of the complexes in powder form and as single crystals by using X-ray diffraction revealed five different structural types, including monomeric, dimeric, and polymeric. The local structure in different solutions was studied by using X-ray absorption spectroscopy. The photoluminescence quantum yields (PLQYs) of terbium and europium complexes were 39 and 15%, respectively; the latter value was increased almost twice by using the heterometallic complex [Tb0.5Eu0.5(pfb)(3)(H2O)] (Hpfb=pentafluorobenzoic acid). Due to the effectively utilized sensitization strategy (pfb)(-)-> Tb -> Eu, a pure europium luminescence with a PLQY of 29% was achieved.
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