Abstract
Accurate tracking of Cu2+ is of major significance for several fields from human health to the environment and industry. Hence, well-organized, sensitive, and accurate methods for Cu2+ recognition in solutions are in special request. Herein, a novel phenolphthalein-based fluorogenic probe has been constructed by integrating a phenolphthalein-based building block with an amine-containing molecule. The probe was explored as a“switch-off” fluorogenicsensorfor Cu2+signaling in the presence of interfering cations in ionic concentrations and also displayed perfect selectivity/sensitivity toward Cu2+and faster equilibrium response time than any other reportedfluorogenic probes. As a sensing platform, the probe has a moderately experimental LOD of 84.0 nM Cu2+ in HEPES:CH3CN (v:v, 1:1, pH = 7). Binding affinity tests, MALDI–TOF MS techniques and theoretically DFT computations demonstrated that Cu2+formed coordinate bonds with phenolic hydroxyl and –CH = N groups of FPAB. The probe was successfully utilized for Cu2+ sensing in theFPABcoated silica plates and cotton swabs. The present study offers a fast, visible, low-cost and precise process for Cu2+ sensing.
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