An “off–on” fluorescent naphthalimide-based sensor for anions: its application in visual F⁻ and AcO⁻ discrimination in a self-assembled gel state

Abstract

Herein, we report a novel fluorescent organogelator that could discriminate F− from AcO− in both solution and gel systems.

Switchable Optical Probes for Simultaneous Targeting of Multiple Anions

“…Similarly, Ren and coworkers recently developed a fluorescent organogelator system 69based with naphthalene diimide as the signalling moiety. [151] Addition of F À ion showed a rapid gel-to-sol transition with drastic fluorescence enhancement, while no gel collapsing was observed with AcO-ion in spite of large change in fluorescence color. Moreover, interaction with AcO-was found to be sufficiently slow, needed~1 h incubation time.…”

“…On the contrary, AcO − anion is trigonal in shape and larger size than that of F − , which altered the intermolecular interactions in a sufficient extent, enough to resulted in a gel‐sol phase transition. Similarly, Ren and coworkers recently developed a fluorescent organogelator system 69 based with naphthalene diimide as the signalling moiety . Addition of F − ion showed a rapid gel‐to‐sol transition with drastic fluorescence enhancement, while no gel collapsing was observed with AcO‐ ion in spite of large change in fluorescence color.…”

Stimuli responsive dynamic transformations in supramolecular gels

“…26). 351 While addition of F À ion resulted in a rapid gel-to-sol transition associated with a colour change from red to dark blue, addition of AcO À ion showed only a colour change of the gel from red to black without a phase transition. The colour changes under both conditions were attributed to the deprotonation of the acidic -NH that enhanced the p-electron conjugation.…”

A simple colorimetric and ratiometric fluoride ion probe with large color change

“…The sensing and recognition of anions have been considered as a hot topic due to the fundamental and crucial roles of anions in the environment and biological elds. [1][2][3][4][5][6][7][8][9][10] Among them, uoride is an essential trace element in the human body and widely exists in nature in the form of uorine ions. [11][12][13][14][15] Either deciency or excess of uoride in the human body would lead to dental caries, such as osteoporosis, uorosis and urolithiasis, and so on.…”