A fluorescent receptor for halide recognition: clues for the design of anion chemosensors.

作者: Riccardo Chelli , Giangaetano Pietraperzia , Andrea Bencini , Claudia Giorgi , Vito Lippolis

DOI: 10.1039/C5CP00131E

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摘要: The chemosensing properties of the polyaza-macrocycle 1-(6,7)-acridine-3,6,9,12-tetraaza-tridecaphane have been investigated by means emission fluorescence spectroscopy, considering halide ions as substrates. As in case free ligand, complexes is due to acridinium species which are formed after photoinduced proton transfer reaction. complexation constants obtained for bi- and tri-protonated ligands deoxygenated aqueous solutions. Two different behaviours observed varying anion. Fluoride chloride give rise enhancement whereas bromide iodide strongly quench emission. macrocycle shows an unusual higher selectivity towards anion rather than fluoride. has modelled a modified Stern–Volmer equation, taking into account quenching effects largest anions, can be considered negligible fluoride anions. Ab initio calculations allow us interpret terms activation energy related reaction responsible process.

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