title: Supramolecular luminescent lanthanide dimers for fluoride sequestering and sensing.
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.
authors.affiliation: LIMAA, IPHC, UMR 7178 CNRS, Université de Strasbourg, ECPM, 25 rue Becquerel, 67087 Strasbourg Cedex (France).
authors.forename: Tao
authors.initials: T
authors.lastname: Liu
authors.forename: Aline
authors.initials: A
authors.lastname: Nonat
authors.forename: Maryline
authors.initials: M
authors.lastname: Beyler
authors.forename: Martín
authors.initials: M
authors.lastname: Regueiro-Figueroa
authors.forename: Katia
authors.initials: K
authors.lastname: Nchimi Nono
authors.forename: Olivier
authors.initials: O
authors.lastname: Jeannin
authors.forename: Franck
authors.initials: F
authors.lastname: Camerel
authors.forename: François
authors.initials: F
authors.lastname: Debaene
authors.forename: Sarah
authors.initials: S
authors.lastname: Cianférani-Sanglier
authors.forename: Raphaël
authors.initials: R
authors.lastname: Tripier
authors.forename: Carlos
authors.initials: C
authors.lastname: Platas-Iglesias
authors.forename: Loïc J
authors.initials: LJ
authors.lastname: Charbonnière
mesh_terms: D002623:Chemistry Techniques, Analytical; D019281:Dimerization; D005459:Fluorides / Q000737:chemistry*; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D049408:Luminescent Agents / Q000737:chemistry*; D015394:Molecular Structure; D064449:Sequestering Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D028581:Lanthanoid Series Elements; D049408:Luminescent Agents; D064449:Sequestering Agents; D014867:Water; D005459:Fluorides
keywords: dimers; fluoride; lanthanides; luminescence; sensing