An efficient water-soluble fluorescent chemosensor based on furan Schiff base functionalized PEG for the sensitive detection of Al³⁺ in pure aqueous solution

Abstract

<p>An efficient reversible fluorescent chemosensor, PEGFB, based on polyethylene glycol bearing a furan Schiff base unit has been successfully developed to sensitively detect Al³⁺ in pure aqueous solution.</p>

Schiff Bases and Multidentate Organic Compounds as Fluorescent Sensors of Al3+: Photophysical, Fluorescent Bioimaging and the Mechanisms

“…Bai et al reported a reversible fluorescent probe based on furan Schiff base (L18) functionalized PEG for recognition of Al 3 + in aqueous solution, and in the presence of other coexistent metal ions, displaying a color change from colorless to bright cyan. [64] An INHIBIT logic gate was created, thanks to the reversible fluorescence response of the L18 upon alternate addition of Al 3 + and EDTA. The sensing mechanisms was ascribed to the chelation-enhanced fluorescence (CHEF) effect caused by the complexation of the probe and the metal, also the C=N isomerization and the inhibition of the photoinduced electron transfer (PET) effect influence the fluorescence enhancement.…”

“…Bai et al . reported a reversible fluorescent probe based on furan Schiff base ( L18 ) functionalized PEG for recognition of Al 3+ in aqueous solution, and in the presence of other coexistent metal ions, displaying a color change from colorless to bright cyan [64] . An INHIBIT logic gate was created, thanks to the reversible fluorescence response of the L18 upon alternate addition of Al 3+ and EDTA.…”

Paper-Based Fluorescence Chemosensors for Metal Ion Detection in Biological and Environmental Samples

“…Significantly, the LOD of Al 3+ was 7.9 × 10 −9 M. Recently, a thiophenebased fluorescence chemosensor (PEGSB) was used for Al 3+ detection following the same mechanisms as those of the PEGBHB and PEGFB chemosensors [57]. However, the LOD was calculated to be as low as 1.32 × 10 −8 M, implying a higher sensitivity than those in previously published methods [26,56].…”

“…The LOD of Al 3+ was 9.67 × 10 −9 M, which was much higher than those of the other Schiff base methods [53][54][55]. Interestingly, the same group also synthesized a furan-based PEG polymer (PEGFB) for Al 3+ detection using a turn-on fluorescence strategy [56]. In this process, Al 3+ chelated with PEGFB via the attachment of the hydroxyl, carbonyl, and imine groups to form stable complexes.…”

“…The LOD of Zn 2+ was estimated to be 1 µM when using this chemosensor in the paper strip [87]. For better solubility in the aqueous solution, polymer-based fluorescence chemosensors are preferred for metal ion detection [26,56,57]. Hence, a polymer conjugated with fluorene, quinoline, and benzothiazole moieties was utilized to fabricate a polymer-based PFQT chemosensor.…”