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A quinoline-based colorimetric chemosensor (QDB) for Cu 2+ was synthesized by coupling quinoline-2-carbaldehyde with 4-(dimethylamino)benzohydrazide. Although most transition metal cations can cause redshifts in the UV–vis spectrum of QDB, the response of the chemosensor for Cu 2+ can be easily distinguished because it exhibits the largest redshift together with a color change from...
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