Highly selective turn-on fluorogenic chemosensor for Zn2+ based on chelation enhanced fluorescence

Turn on Fluorescence Sensing of Zn2+ Based on Fused Isoindole-Imidazole Scaffold

“…That dissimilarity in the emission arises from a ESIPT (Excited State Intramolecular Proton Transfer) process. Indeed, earlier works demonstrated that probes with hydroxy-imine moieties are associated to lower fluorescence because of ESIPT equilibria [71]. Such scenario is correctly reproduced by our computational approach, which shows that the spectroscopic transition is characterized by a partial transfer of electron density from the phenolic oxygen to the imine nitrogen, as concluded from the inspection of the molecular orbitals involved (Figure S19).…”

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

“…Venkatesan et al reported a zinc sensor in 2019, which showed a sensing mechanism similar to that reported in our work. 54 Also in 2016, Torawane et al published a work on a “turn-on” Al 3+ sensor, which includes CHEF and CN isomerization as the sensing mechanism. 55…”

“…Venkatesan et al reported a zinc sensor in 2019, which showed a sensing mechanism similar to that reported in our work. 54 Also in 2016, Torawane et al published a work on a "turn-on" Al 3+ sensor, which includes CHEF and C]N isomerization as the sensing mechanism. 55 Again the binding mechanism of the probe and Cd 2+ was studied by Job's plot to determine the exact stoichiometry of complex formation, where we observed a maximum near 0.66, which suggests a 2 : 1 complex formation of HBMC and Cd 2+ (Fig.…”

Synthesis of an advanced metal-guided photochromic system for molecular keypad lock: detailed experimental findings and theoretical understanding

“…The strong green fluorescence at 501 nm may be attributed to the metal-guided (Zn) chelation-enhanced fluorescence effect (MG-CHEF). 31,32 Here, two key factors probably control the MG-CHEF. The primary one is the inhibition of a photo-induced electron transfer (PET) process through the coordination of Zn 2+ with the nitrogen atom of the photo-ligand.…”