A new Schiff base as a turn‐off fluorescent sensor for Cu²⁺ and its photophysical properties

Abstract

A new Schiff base receptor 1 was synthesized and its photophysical properties were investigated by absorption, emission and excitation techniques. Furthermore, its chromogenic and fluorogenic sensing abilities towards various metal ions were examined. Receptor 1 selectively detects Cu ion through fluorescence quenching and detection was not inhibited in the presence of other metal ions. From fluorescence titration, the limit of detection of receptor 1 as a fluorescent 'turn-off' sensor for the analysis of Cu was estimated to be 0.35 μM.

Highly Selective and Sensitive Dual Channel New Schiff base Chemosensor based on 5‐bromo‐2‐hydroxybenzaldehyde and its Co(II), Ni(II), Cu(II) and Zn(II) Complexes ‐ Synthesis, Spectral and Theoretical characterization and Pharmacological applications

“…The structure of the Schiff base BBSDN is optimized by using DFT analysis. [56,57] DFT analysis is carried out with respect to Mulliken Charge Analysis, HOMO -LUMO energy gap and MEP (figure 16). Quenching due to CHEQ effect [52] ≈ 8000 a.u Mulliken charge analysis proves that the electron rich centers are azomethine nitrogen and phenolic oxygen atoms.…”

Fluorescent Schiff base sensors as a versatile tool for metal ion detection: strategies, mechanistic insights, and applications

“…19 and Table 2). 111 Among various tested metal ions, sensor 45 underwent instant fluorescence quenching only with Cu 2+ at emission wavelength 554 nm (l ex = 386 nm) in an aqueous solution. The detection limit of sensor 45 was 0.35 mM for Cu 2+ .…”

Homo- and Hetero-Oligonuclear Complexes of Platinum Group Metals (PGM) Coordinated by Imine Schiff Base Ligands

“…SBs can be applied for solvent extraction of metal ions [71][72][73]. Schiff Bases and their transition metal complexes are applied as an efficient optical chemical [74][75][76] or electrochemical sensors for detection of analytes in forensic, pharmaceutical and environmental samples [74,[77][78][79][80]. Oligonuclear PGM complexes are assessed as prospective phosphorescent emitters in organic light-emitting diodes (OLEDs) [81].…”