A fluorescent and colorimetric Schiff base chemosensor for the detection of Zn and Cu: Application in live cell imaging and colorimetric test kit.

A novel Schiff base chemosensor HMID, ((E)‑1‑((2‑hydroxy‑3‑methoxybenzylidene)amino)imidazolidine‑2,4‑dione), have been designed and synthesized. Sensor HMID showed a selectivity to Zn through fluorescence enhancement in aqueous solution. Its detection limit was analyzed as 11.

A Colorimetric and Fluorescent Chemosensor for the Selective Detection of Cu and Zn Ions.

A new bi-functional chemosensor 1 based on 3,5-dichlorosalicylaldehyde and 2-(methylthio)aniline has been synthesized. It can detect Cu with a color change from pale yellow to dark yellow in aqueous solution. The selective mechanism of 1 for Cu was proposed to be the enhancement of the intramolecular charge transfer (ICT) band, which was explained by theoretical calculations.