Dual-channel detection of Cu2+ and F− with a simple Schiff-based colorimetric and fluorescent sensor

A Bis(Boronic Ester)-Based Fluorogenic and Chromogenic Sensor for F-and Cu2+

“…So, upon addition of excess (more than two equiv) F – ion, at first hydrogen bond formation occurs between phenolic –OH and F – ion, which is followed by deprotonation. Consequently, charge density of the receptor increases appreciably, resulting in the fluorescence turn‐on and red shifting of the absorption band ,…”

A selective sulphur‐containing colorimetric chemosensor for Cu2+

“…Sulphur is well known to have a high affinity to Cu 2+ , Ag + and Hg 2+ , and a number of sulphur‐containing sensors have been reported to detect the three metals . In order to selectively detect only Cu 2+ among them, we endowed the sensor APTS with a hard character by using moieties with nitrogen and oxygen atoms . As expected, the sensor APTS detected only Cu 2+ via the colour change from colourless to yellow.…”

A novel colorimetric probe derived from isonicotic acid hydrazide for copper (II) determination based on internal charge transfer (ICT)

“…Addition of Cu 2+ to the solution of BMSRH results in a rapid color change from colorless to red together with an obvious new band appeared at 552 nm in the UV-vis absorption spectra with a detection limit of 6.67 Â 10 À7 mol/L. Na [33] synthesized colorimetric and fluorescent receptor 1, based on 4-diethylaminosalicylaldehyde moieties with a detection limit of 12 lM for Cu 2+ determination. In the present study, we designed and synthesized a novel isonicotic acid hydrazide Schiff base derivative N 0 -(3,5-di-t ert-butyl-2-hydroxy-benzylidene) isonicotinohydrazide (DHIH), for rapid selective and sensitive response to Cu 2+ in acetonitrile and water media.…”