Colorimetric and fluorescence "turn-on" recognition of fluoride by a maleonitrile-based uranyl salen-complex. (December 2016)

• Record Type: Journal Article
• Authors: Bartocci, Silvia; Sabaté, Ferran; Bosque, Ramon; Keymeulen, Flore; Bartik, Kristin; Rodríguez, Laura; Dalla Cort, Antonella
• Is Part Of: Dyes and pigments. Volume 135(2016)
• Page Start: 94
• Page End: 101
• Publication Date: 2016-12
• Subjects: Fluoride recognition -- Turn-on response -- Uranyl salen -- DFT calculations; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2016.06.006
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: 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. Compound2 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. Graphical abstract: Highlights: Two new uranyl-salen complexes based on a 1, 2-diaminomaleonitrile are described. Spectroscopic studies proof their potential use for fluoride detection. The presence of two bulky substituents favors the molecular recognition process. DFT calculations support the experimental data.