Fluoride binding in water with the use of micellar nanodevices based on salophen complexes

Abstract

The use of micelles to transpose lipophilic receptors, such as uranyl-salophen complexes, into an aqueous environment is a valuable and versatile tool. Receptor 1 incorporated into CTABr micelles forms a supramolecular system that exhibits excellent binding properties towards fluoride in water, despite the competition of the aqueous medium. To fully evaluate the potential of micellar nanodevices, we extended our previous study to other types of surfactants and to a uranyl-salophen receptor with a more extended aromatic surface. Paramagnetic relaxation enhancement experiments were used to obtain information on the location of the two receptors within the micelles and complementary information was obtained from dynamic light scattering experiments. With these data it is possible to account for the key factors necessary to obtain an efficient supramolecular device for anion binding in water.

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

“…An equatorial position thus remains available for a guest that can be complexed through Lewis acid-base interactions [30]. Uranyl-sal(oph)en complexes have proved to be excellent receptors for fluoride in organic solvents (K a > 10 6 M -1 ) [17] and such affinity, obviously lowered by the competitive medium, is also preserved when working in water [31][32][33][34].…”

Ionic Liquid-Based Polymer Electrolytes via Surfactant-Assisted Polymerization at the Plasma–Liquid Interface

“…As seen in Figure 2(c), the 1 H NMR spectra showed lower shifted peaks at 1.22, 3.31, and 3.87 ppm, which are attributed to the alkyl chain in the IL and the hydrophobic tail of Triton X100 with a downshift in relation to the pure IL and Triton X100. 34 These results indicate that ethylene oxide radical units of Triton X100 bind with IL; this leads to a decrease in the electron cloud density on oxygen atoms of the ethylene oxide units. 35 Thus, a lower chemical shift was observed.…”

Turn-on fluorescent probe designed for fluoride ion sensing in aqueous media

“…3 In past decade, a large number of fluorescent probes for F  sensing have been developed exploiting anion-π interaction, 4 hydrogen bonding, 5 Lewis acid-base interaction 2b, 6 and fluoride induced chemical reaction. 7 Hydrogen bonding approach is not effective in aqueous solution owing to the strong tendency of hydration of fluoride ions.…”