Paper-based device for nanomolar detection of Cd2+ using AIEE-active imidazolium ionic liquid functionalized phenothiazine based Schiff-Base

Functionalized Schiff-base containing phenothiazine and cholic acid as a paper-based fluorescence turn-off sensor for Sn(ii) ion detection and its application

“…The photoinduced electron transfer (PET) process, which involves the transfer of an excited state electron from the fluorophore to the metal ion, is responsible for the practical quenching of fluorescence emission. 46–48…”

Red-Emitting AIEE-Active Rhodamine-Based Ionic Liquid for the Ultrasensitive and Selective Detection of Mercury Ions

“…These findings support the excited state π–π* transition that causes the quenching of fluorescence emission. The reactivity of molecules is dramatically affected by complexation . For instance, the decrease in the band gap demonstrates the attainment of stability on RhB-IL–Hg 2+ complex formation.…”

“…The reactivity of molecules is dramatically affected by complexation. 57 For instance, the decrease in the band gap demonstrates the attainment of stability on RhB-IL−Hg 2+ complex formation.…”

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

“…It can recognize Cd 2+ in ACN/Tris-HCl buffer (3:2, v/v, pH = 7.4), eliciting a significant color change (from colorless to yellow), fluorescence turn-on at 547 nm, and has a detection limit of 1.05 × 10 −8 M. The 1:1 complex formation between BPC and Cd 2+ can block both isomerization of C-N and the ESIPT process; meanwhile, it enhances the molecular rigidity, resulting in chelation-enhanced fluorescence (CHEF). A highly green fluorescent phenothiazinebased imidazolium ionic liquid sensor, [PTZ-SB][Br], was synthesized [98]. The sensor can recognize Cd 2+ in the THF/H 2 O (1:9, v/v) system, achieving an incredible 38.1-fold increase in fluorescence intensity with a detection limit of 3.8 × 10 −7 M. Investigators demonstrated that this change was due to the aggregation-induced enhanced emission (AIEE) phenomenon.…”