Coumarin Derived “Turn on” Fluorescent Sensor for Selective Detection of Cadmium (II) Ion: Spectroscopic Studies and Validation of Sensing Mechanism by DFT Calculations

Iron(III), copper(II), cadmium(II), and mercury(II) complexes of isatin carbohydrazone Schiff base ligand (H3L): Synthesis, characterization, X‐ray diffraction, cyclic voltammetry, fluorescence, density functional theory, biological activity, and molecular docking studies

“…This lead to inhibition in the CN isomerization resulting in chelation‐enhanced fluorescence effect (CHEF). [ 60 ] The plot of emission intensity with the raised concentration of Cd(II) ion suggests that the H 3 L ligand can be used for the quantitative analysis of Cd(II) ions in the aqueous solution. On the other hand, the emission spectrum of the ligand in the existence of Cu(II) ions was found to be quenched and the quenching increased by the increase in the Cu(II) ions concentration “6.6–16 μM concentration” (Figure 8).…”

Recent progress in cadmium fluorescent and colorimetric probes

“…In addition, coumarin is easy to connect to different groups, and can not only act as a uorescent chromophore, but also as recognition sites of analytes, so as to achieve uorescence response to different analytes. 34,49 3.1 Coumarin as a binding site for Cd 2+ In 2017, C. Kumari's research team synthesized probe 19 (Fig. 8), which recognizes Cd 2+ and turns on uorescence.…”

“…8 ) in 2019. 49 The spectral studies were carried out in a THF/H 2 O (1 : 1) solution and an excitation at 300 ± 5 nm. Probe 22 chelating Cd 2+ inhibited C N isomerization of probe, so the fluorescence of probe 22 increased and the fluorescence emission intensity is linearly related to the Cd 2+ of 1–15 μM.…”

New 3-Ethynylaryl Coumarin-Based Dyes for DSSC Applications: Synthesis, Spectroscopic Properties, and Theoretical Calculations

“…The push-pull effect in these D-π-A dyes leads to efficient intramolecular charge transfer (ICT) from the donor to the acceptor unit through the π-bridge upon light absorption. Among the many classes of organic compounds used, coumarins are of particular interest due to their wide use as fluorescent sensors [17][18][19], emitting layers in Organic Light-Emitting Diodes (OLEDs) [20][21][22] and in laser applications [23,24], owing to their large Stokes shift, high quantum yields and good solubility. Additionally, their photophysical properties can be easily tuned through the addition of substituents, namely electron-withdrawing substituents in position 3 and electron-donating substituents in position 7 [25].…”