Abstract
A novel antipyrine-based N,N’-di(antipyrine-4-yl) oxalamide (DAO), which exhibits selective colorimetric chemosensor properties for Cu2+ ions, was synthesized in a single-step and characterized using NMR, FT-IR, Mass spectrometry, and UV–Vis spectroscopy. In this study, a fast and effective colorimetric assay was developed for naked-eye detection of Cu2+ ions and a detection limit of 0.42 µM. In addition, the potential application of DAO was expanded for the detection of Cu2+ ions with functional recovery in both natural and simulated water samples. The thermodynamic (∆Go, ∆Ho, and ∆So) and kinetic (Ea) parameters were investigated at four temperatures. The kinetic study showed that the colorimetric chemosensor reacted with Cu2+ ions in accordance with the second-order model. In addition, the binding constant of DAO, which binds with Cu2+ ions according to 1:1 stoichiometry, was calculated as 2.63 × 103 M−1.
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