A single colorimetric sensor for multiple targets: the sequential detection of Co2+ and cyanide and the selective detection of Cu2+ in aqueous solution. Issue 29 (22nd March 2017)

• Record Type: Journal Article
• Authors: Jang, Hyo Jung; Jo, Tae Geun; Kim, Cheal
• Is Part Of: RSC advances. Volume 7:Issue 29(2017)
• Page Start: 17650
• Page End: 17659
• Publication Date: 2017-03-22
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra01580a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A colorimetric chemosensor was developed for simultaneous detection of Co 2+ and Cu 2+ and for sequential recognition of Co 2+ and CN − . Abstract : A new highly selective and multifunctional chemosensor1 for the detection of Co 2+, Cu 2+ and CN −, based on 4-diethylaminosalicyl aldehyde and thiophene-2-carbohydrazide moieties, was designed and synthesized.1 could simultaneously detect both Co 2+ and Cu 2+ by changing its color from colorless to yellow in aqueous solution. The binding modes of1 to Co 2+ and Cu 2+ were determined to be a 2 : 1 complexation stoichiometry through job plot and ESI-mass spectrometry analysis. The detection limits (0.19 μM and 0.13 μM) of1 for Co 2+ and Cu 2+ were lower than the DEP guideline (1.7 μM) of Co 2+ and the WHO guideline (31.5 μM) of Cu 2+ for drinking water. Importantly, 1 could detect and quantify Co 2+ and Cu 2+ in real water samples. Moreover, the resulting Co 2+ -2·1 complex sensed cyanide through naked-eye, showing recovery from Co 2+ -2·1 to1 . The sensing mechanisms of Cu 2+ by1 were explained by theoretical calculations.