Sulfonamide-imines as selective fluorescent chemosensors for the fluoride anion.

  title={Sulfonamide-imines as selective fluorescent chemosensors for the fluoride anion.},
  author={Miguel V{\'a}zquez L{\'o}pez and Manuel R. Bermejo and M. Eugenio V{\'a}zquez and Angelo Taglietti and Guillermo Zaragoza and Rosa Pedrido and Miguel Mart{\'i}nez‐Calvo},
  journal={Organic \& biomolecular chemistry},
  volume={8 2},
Two new sulfonamide-type fluorescent chemosensors in organic media are reported. The two receptors, [N,N'-bis(2-tosylaminobenzylidene)-1,2-diaminoethane and N,N'-bis(2-tosylaminobenzylidene)-1,3-diamino-2-propanol], display marked changes in the fluorescence emission intensities as a result of deprotonation by basic anions, and show high selectivity for fluoride over other inorganic anions, such as acetate or dihydrogenphosphate. These results suggest that the presence of the imine group as an… 
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Anion-induced urea deprotonation.
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The orange-red deprotonated urea solution uptakes carbon dioxide from air to give the tetrabutylammonium salt of the hydrogencarbonate H-bond complex, [Bu4N][1.HCO3], whose crystal and molecular structures have been determined.
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