An NBD-based two-in-one Cu2+/Ni2+ chemosensor with differential charge transfer processes. (18th January 2016)

• Record Type: Journal Article
• Authors: Rani, Richa; Paul, Kamaldeep; Luxami, Vijay
• Is Part Of: New journal of chemistry. Volume 40:Number 3(2016:Mar.)
• Page Start: 2418
• Page End: 2422
• Publication Date: 2016-01-18
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c5nj02648b
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : A new multifunctional NBD-based probe for differential sensing of Cu 2+ /Ni 2+ ions through visible color changes in semi-aqueous systems. Abstract : A new multifunctional NBD-based probe has been developed having high sensitivity and selectivity towards Cu 2+ /Ni 2+ over other metal ions over a wide pH range. The probe1 could be used for the simultaneous estimation of Cu 2+ and Ni 2+ ions through its visible color change from yellow to blue and light green, respectively, in semi-aqueous systems. The binding mode of probe1 to Cu 2+ and Ni 2+ was determined to be a 1 : 1 complexation stoichiometry using a Job's plot. Ethylenediamine tetraacetate showed high selectivity towards the in situ prepared Cu 2+ complex over the Ni 2+ complex, which is applied to distinguish Ni 2+ and Cu 2+ ions. The detection limits for Cu 2+ and Ni 2+ ions, 1.8 × 10 −7 M and 1.1 × 10 −6 M, respectively, were lower than those recommended by the WHO guidelines for drinking water. Moreover, probe1 could be used as a practical, visible colorimetric test kit for Cu 2+ ions. The sensing mechanism of Cu 2+ and Ni 2+ ions was supported by DFT-calculations.