Supramolecular Luminescent Lanthanide Dimers for Fluoride Sequestering and Sensing |
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| Authors: | Dr Tao Liu Dr Aline Nonat Dr Maryline Beyler Dr Martín Regueiro‐Figueroa Dr Katia Nchimi?Nono Dr Olivier Jeannin Dr Franck Camerel Dr François Debaene Dr Sarah Cianférani‐Sanglier Prof Raphaël Tripier Dr Carlos Platas‐Iglesias Dr Loïc J Charbonnière |
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| Institution: | 1. LIMAA, IPHC, UMR 7178 CNRS, Université de Strasbourg, ECPM, 25 rue Becquerel, 67087 Strasbourg Cedex (France);2. Université de Bretagne Occidentale, UMR‐CNRS 6521/IFR148 ScInBioS, 6 avenue Victor le Gorgeu, C.S. 93837, 29238 Brest Cedex 3 (France);3. Departamento de Química Fundamental, Universidade da Coru?a, Alejandro de la Sota 1, 15008A Coru?a (Spain);4. MaCSE, Institut des Sciences Chimiques de Rennes (ISCR), UMR‐CNRS 6226, 263 Avenue du Général Leclerc, CS 74205, 35042 Rennes Cedex (France);5. LSMBO, IPHC, UMR 7178 CNRS‐Université de Strasbourg, ECPM, 25 rue Becquerel, 67087 Strasbourg (France) |
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| Abstract: | Lanthanide complexes (Ln=Eu, Tb, and Yb) that are based on a C2‐symmetric cyclen scaffold were prepared and characterized. The addition of fluoride anions to aqueous solutions of the complexes resulted in the formation of dinuclear supramolecular compounds in which the anion is confined into the cavity that is formed by the two complexes. The supramolecular assembly process was monitored by UV/Vis absorption, luminescence, and NMR spectroscopy and high‐resolution mass spectrometry. The X‐ray crystal structure of the europium dimer revealed that the architecture of the scaffold is stabilized by synergistic effects of the Eu? F? Eu bridging motive, π stacking interactions, and a four‐component hydrogen‐bonding network, which control the assembly of the two EuL] entities around the fluoride ion. The strong association in water allowed for the luminescence sensing of fluoride down to a detection limit of 24 nM . |
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| Keywords: | dimers fluoride lanthanides luminescence sensing |
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