Highly Luminescent,Water‐Soluble Lanthanide Fluorobenzoates: Syntheses,Structures and Photophysics,Part I: Lanthanide Pentafluorobenzoates |
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| Authors: | Alena S Kalyakina Dr Valentina V Utochnikova Dr Ivan S Bushmarinov Dr Ivan V Ananyev Prof?Dr Igor L Eremenko Dr Daniel Volz Franziska Rönicke Dr Ute Schepers Prof?Dr Rik Van?Deun Dr Alexander L Trigub Prof?Dr Yan V Zubavichus Prof?Dr Natalia P Kuzmina Prof?Dr Stefan Bräse |
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| Institution: | 1. Institute of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz‐Haber‐Weg 6, D‐76131 Karlsruhe (Germany);2. Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1, build.3, 119991, Moscow (Russian Federation);3. P. N. Lebedev Physical Institute, Leninsky prosp. 53, 119991, Moscow (Russian Federation);4. A. N. Nesmeyanov Institute of Organoelement Compounds, Vavilova St. 28, INEOS, 119991, Moscow (Russian Federation);5. Kurnakov Institute of General and Inorganic Chemistry, Leninsky prosp. 31, 119991, Moscow (Russian Federation);6. Cynora GmbH, Werner‐von‐Siemens‐Stra?e 2‐6, 76646 Bruchsal (Germany);7. Institute of Toxicology and Genetics, Karlsruhe Institute of Technology (KIT), Hermann‐von‐Helmholtz‐Platz 1, D‐76344 Eggenstein‐Leopoldshafen (Germany);8. L3‐Luminescent Lanthanide Lab, f‐Element Coordination Chemistry, Inorganic and Physical Chemistry Department, Ghent University, Krijgslaan 281, building S3, 9000 Gent (Belgium);9. NRC “Kurchatov Institute”, Akademika Kurchatova pl. 1, 123182, Moscow (Russian Federation) |
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| Abstract: | Highly luminescent, photostable, and soluble lanthanide pentafluorobenzoates have been synthesized and thoroughly characterized, with a focus on EuIII and TbIII complexes as visible emitters and NdIII, ErIII, and YbIII 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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| Keywords: | aromatic carboxylates fluorobenzoates lanthanides luminescence near‐IR structure elucidation |
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