A Rhodamine B-based fluorescent probe for imaging Cu2+ in maize roots

Thermally Activated Delayed Fluorescent Polymer Dots for Electrochemiluminescent Sensing of Cu2+ Ions

“…Metal–ion sensing in aqueous media is significant in environmental detection and disease prevention. Copper ion (Cu 2+ ) detection is significant because excessive Cu 2+ is the cause of various diseases. − The sensing experiments to detect Cu 2+ were performed by using PABPC5-Pdots/TEA. Figure A shows that the ECL intensity of PABPC5-Pdots/TEA is monotonically quenched with the increasing Cu 2+ concentration.…”

An Effective ‘Off-On’ Artificial Probe Based on Rhodamine B Derivative for Sensitive and Selective Recognition of Cu2+ Ions

“…For practical application, reversibility, which indicates the capability of restoring the metal-free sensor from the complex form, is a desired property of molecular sensing platforms (Wang et al, 2014;Lv et al, 2018). An effective complexing reagent for metal cations, EDTA, was operated to investigate the reversibility and reproducibility of receptor RhCHN for Cu 2+ .…”

“…Although they are high performance systems, these procedures generally require complex sample pretreatment, expensive and sophisticated instruments, operational management requirements and therefore a time-consuming process. In this regard, fluorescent receptor dyes capable of binding to toxic transition metal ions have recently become the focus of scientific interest due to their distinct advantages; ease of use, low cost, real-time analysis and rapid response, high reliability, and selectivity and sensitivity to metal ions in aqueous solutions (Ding et al, 2017;Udhayakumari et al, 2017;Xu et al, 2011;Tang et al, 2018;Lv et al, 2018;Zhou et al, 2009;Min et al, 2013;Yu et al, 2013).…”

An On–Off–On Fluorescence Probe Based on Coumarin for Cu2+, Cysteine, and Histidine Detections

“…24–32 Although a number of fluorescence probes or chemical sensors for Cu 2+ , Cys, and His have been reported, it is not enough because there are still many performances that need to be improved for application requirements. 33–47…”

“…[24][25][26][27][28][29][30][31][32] Although a number of fluorescence probes or chemical sensors for Cu 2þ , Cys, and His have been reported, it is not enough because there are still many performances that need to be improved for application requirements. [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47] Herein, we designed a small molecule with an on-off-on characteristic by the action of Cu 2þ , Cys, and His. As shown in Scheme 1, Cu 2þ prefers a coordination sphere containing N, S, and O as donor atoms, and can prompt the intersystem crossing (ISC) of the excited electrons from the excited singlet states to the excited triplet states because of the paramagnetic nature, which results in the significant fluorescence quenching of probe L. 48,49 Cys and His could despoil Cu 2þ ions from L-Cu 2þ ensemble because of good combination ability and lead to the fluorescence recovery of probe L.…”