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Colorimetric and fluorescence “turn-on” recognition of fluoride by a maleonitrile-based uranyl salen-complex

par Bartocci, Silvia;Sabaté, Ferran;Bosque, Ramon;Keymeulen, Flore ;Bartik, Kristin ;Rodríguez, Laura;Dalla Cort, Antonella
Référence Dyes and pigments, 135, page (94-101)
Publication Publié, 2016-12

Article révisé par les pairs

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Résumé :

The synthesis and characterization of two new uranyl-salen complexes, 1–2, based on a 1,2-diaminomaleonitrile unit, is described. Spectroscopic studies to evaluate their potential as colorimetric probes for fluoride detection in chloroform and dichloromethane were undertaken. Compound 2 exhibits a ‘turn-on’ response characterized by a naked-eye colorimetric change for the selective recognition of fluoride in both solvents. DFT calculations show that the stabilization energy for the formation of the host:guest complex follows the trend F− > Cl− > Br− hence supporting the experimental data.