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Paper
Org. Biomol. Chem., 2009, 7, 3499 - 3504, DOI: 10.1039/b908433a
Fluoride recognition by a chiral urea receptor linked to a phthalimide chromophore
Raúl Pérez-Ruiz, Yrene Díaz, Bernd Goldfuss, Dirk Hertel, Klaus Meerholz and Axel G. Griesbeck
The anion chemosensor 1 based on a urea-activated phthalimide with a stereogenic centre was synthesized using an efficient procedure involving a Curtius rearrangement. Its photophysical properties were estimated in several solvents. Sensor 1 detected fluoride with absorption as well as fluorescence changes and was only observable for this case and not for other halides. The appearance of a new CT complex emission at a longer wavelength and no changes in the singlet lifetime of 1 in the presence of fluoride supported a fluorescence static quenching mechanism. 1H-NMR studies, together with theoretical calculations based on DFT methods at the B3lYP/6–31G* level of theory confirmed the formation of a [ 1–F]- complex through H-bonding interactions rather than receptor deprotonation in the recognition process. Reversibility of this process was observed upon addition of a protic solvent.
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