被撤回的出版物: Synthesis and studies of selective chemosensor for naked-eye detection of anions and cations based on a new Schiff-base derivative (Retracted article. See vol. 186, pg. 584, 2018)

A new chromogenic receptor, 4-((2,4-dichlorophenyl)diazenyl)-2-(3-hydroxypropylimino) methyl) phenol, has been designed and synthesized for quantitative and low-cost detection of various biological anions and cations. The dye was characterized by elemental analyses, infrared, UV-visible spectroscopy, and NMR spectroscopy. Upon the addition of F- and H2PO4- to the solution of chemosensor in DMSO, the dramatic naked eye detectable color changes were observed from yellow to red and orange with a limit of detection (LOD) of 1.66 x 10(-6) mol. L-1 and 1.24 x 10-6 mol. L-1 at room temperature, respectively. The chemosensor showed visual changes towards cations, such as Al3+, Cu2+, Fe3+, and Cr3+, in DMSO/water (9:1). The detection limit of receptor L for the analysis of Al3+ ion was calculated to be 3.02 x 10(-6) mol. L-1. The anion recognition property of the receptor via proton transfer was monitored by UV-visible titration and (HNMR)-H-1 spectroscopy. The binding constant (K-a) and stoichiometry of the host-guest complexes formed were determined by the Benesi-Hildebrand (B-H) plot and Job's method, respectively. (C) 2016 Elsevier B.V. All rights reserved.