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A novel quinoline-based colorimetric chemosensor (HL) and its Cu(II) complex (CuL2) were synthesized. HL exhibits an obvious color change from colorless to yellow upon addition of Cu2+ in aqueous medium. This response was investigated by UV–vis absorption and ESI-MS spectra, and all the results indicated the species formed in detection system is CuL2. The color change can be attributed to ligand-metal...
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