A pyridine based Schiff base as a selective and sensitive fluorescent probe for cadmium ions with “turn-on” fluorescence responses

Abstract

A new fluorescent probe based on pyridine Schiff base (2-(pyridine-2-ylmethylene)phenoxyaniline, PMPA) working with PET mechanism and chelation enhanced fluorescence (CHEF) was designed and synthesized for the selective detection of cadmium...

Recent Progress on Fluorescent Probes in Heavy Metal Determinations for Food Safety: A Review

“…The sensor has a binding constant of 4.36 × 10 4 M −1 and a detection limit of 5.74 × 10 −7 M. It has been successfully utilized for accurate detection in tap water samples. PMPA was designed and synthesized as a probe customized by pyridine derivatives with the photoinduced electron transfer (PET) mechanism and chelation-enhanced fluorescence (CHEF) properties for the selective detection of Cd 2+ in ACN [78]. The probe exhibits a wide pH range flexibility (5-9), quick response time (3 min), excellent sensitivity (LOD = 0.12 mM), and favorable reversibility.…”

“…Furthermore, it has been successfully applied to determine real water samples. in ACN [78]. The probe exhibits a wide pH range flexibility (5-9), quick response time (3 min), excellent sensitivity (LOD = 0.12 mM), and favorable reversibility.…”

Recent Advancements in Schiff Base Fluorescence Chemosensors for the Detection of Heavy Metal Ions

“…With a detection limit of 1.025 × 10 −8 M, a Rhodamine-based Schiff-base fluorescence chemosensor 9 was used to find Cd 2+ ions. In the presence of cations, the chemosensor 9 shows significant sensitivity and selectivity for Cd 2+ ions [44]. An ON-type Schiff base chemosensor 10 was communicated in 2020 and its fluorescence properties against cadmium ions were discussed.…”

A biphenyl thiosemicarbazide based fluorogenic chemosensor for selective recognition of Cd2+: application in cell bioimaging

“…47 Sooksimuang et al in 2022 reported a tetrahydro- [5]helicene based uorescent sensor, which detects Cd 2+ in H 2 O/dioxane (1/19, v/v), 48 while Dong's group in 2022 reported a pyridine based Schiff base for detection of cadmium ions with a 'turn-on' uorescence response and a LOD value of 0.12 mM in acetonitrile. 49 A phenazine-imidazole based ratiometric uorescent probe was designed by Wang et al to recognise Cd 2+ ions only in 2022, which showed a limit of detection value of 2.10 × 10 −8 (M). 50 Although Schiff bases containing N, O, S donors binding with Cd 2+ with 2 : 1 stoichiometry are less known, Rajesh et al in 2021 published a work on a quinoline based Schiff base for detecting cadmium in semi aqueous medium with 2 : 1 stoichiometry and a LOD value of 14.8 nM.…”