A Chromone‐Based Fluorescent Chemosensor for Detecting Cu²⁺

Abstract

Selective detection of Cu2+ by OHC via fluorescence quenching response.

Bifunctional Receptor Based on Calix[4]arene with Chromone Groups as An Efficient Colorimetric Sensor for Co2+, Cu2+, CN− and F−

“…Chromones are naturally occurring compounds which are widely known to have anticancer, antioxidant and other biological properties [1] . Chromone derivatives with Schiff base groups have been studied due to properties to form complexes with metal ions such as copper (II), platinum (II), nickel (II) and other transition metals, [1–6] including chromone‐based sensors for the detection of anions [7] . The development of colorimetric sensors for the detection of environmentally and biologically important ionic species is currently of great interest [8–11] .…”

Schiff Base Ligand 3-(-(2-Hydroxyphenylimino) Methyl)-4H-Chromen-4-One as Colorimetric Sensor for Detection of Cu2+, Fe3+, and V5+ in Aqueous Solutions

“…A chromone-based azomethine chemosensor synthesized by the condensation reaction of 3-formylchromone with 2,6pyridinedicarbohydrazide was successfully used as an immediate and naked-eye sensor for Cu 2+ , Zn 2+ , and CN − ions in aqueous media with excellent accuracy and precision with detection limits of 5.50 × 10 −7 , 8.70 × 10 −7 and 1.56 × 10 −6 M, respectively, which are lower than the permissible levels recommended by WHO for safe drinking water [24]. A chromone-based Schif base molecule synthesized by the condensation reaction between 3-formyl chromone and octopamine was reported by Lee and Kim as sensor probe for Cu 2+ ions only by fuorescence quenching with a LOD of 3.95 × 10 −6 M [35]. Compared with the abovereported chromone-based Schif base colorimetric sensors, our synthesized chromone-based Schif base sensor can be considered selective for detecting three metal ions, namely Cu 2+ , Fe 3+ , and V 5+ ions, in aqueous media with excellent accuracy and precision with detection limits of 3.322 × 10 −5 M, 2.065 × 10 −5 M, and 1.782 × 10 −5 M, respectively, which are lower than the permissible level recommended by WHO for safe drinking water.…”