Sequential colorimetric sensor for copper (II) and cyanide ions via the complexation-decomplexation mechanism based on sugar pyrazolidine-3,5-dione

A simple colorimetric water soluble chemosensor for Cu2+ and subsequent CN- anions sensing was designed and fully characterized. The chemosensor consisted of a two sugar pyrazolidine-3,5-dione derivatives linked by an ethylenediamine spacer. Colorimetric titration experiment of the presented probe reveals high selectivity and sensitivity toward Cu2+ over other divalent cations in real samples. Furthermore, the Cu2+-chemosensor complex proved to be capable of sensing CN- anions in water by forming Cu(CN)(2). The calculated LOD for Cu2+ and CN- ions were calculated to be 0.19 and 0.48 mu M respectively, which means that the presented probe allows largely the simultaneous detection and quantification of Cu2+ and CN- ions in water samples. (C) 2021 Elsevier B.V. All rights reserved.