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Supramolecular luminescent lanthanide dimers for fluoride sequestering and sensing.

Authors
Type
Published Article
Journal
Angewandte Chemie International Edition in English
1521-3773
Publisher
Wiley Blackwell (John Wiley & Sons)
Publication Date
Volume
53
Issue
28
Pages
7259–7263
Identifiers
DOI: 10.1002/anie.201404847
PMID: 24909695
Source
Medline
Keywords
  • Dimers
  • Fluoride
  • Lanthanides
  • Luminescence
  • 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.

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