1. On the synthesis and performance of a simple colorimetric and fluorescent chemosensor for Cu2+ with good reversibility.
- Author
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Wang, Bin, Xu, Weiling, Gan, Kaifeng, Xu, Ke, Chen, Qiaojie, Wei, Wei, and Wu, Wei
- Subjects
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CHEMORECEPTORS , *CHARGE transfer , *DETECTION limit , *DRINKING water - Abstract
[Display omitted] • A colorimetric and fluorescent chemosensor for Cu2+ based on internal charge transfer (ICT) was synthesized. • A visually dramatic color change from light green to orange, which can be used for qualitative determination of Cu2+. • Reliable detection of Cu2+ at concentrations ranging from 5.0 × 10−7 to 1.1 × 10−5 M with detection limit of 1.2 × 10−7 M was realized. A colorimetric and fluorescent chemosensor (CS1) for Cu2+ based on the mechanism of internal charge transfer (ICT) has been successfully designed and prepared by simple condensation of 4_(diethylamino)salicylaldehyde and oxalyl dihydrazide. Cu2+ in solution (DMSO/H 2 O = 7:3, v/v) by 5 mM NaAc–HAc at pH 7.0 was determined through dual channels: (1) "naked-eye" observation, a visually dramatic color change from light green to orange, which can be used for qualitative determination of Cu2+; (2) spectrofluorometry, which can quantificationally assay Cu2+. It provides a simple-to-use platform for reliable detection of Cu2+ at concentrations ranging from 5.0 × 10−7 to 1.1 × 10−5 M with detection limit of 1.2 × 10−7 M, which is nearly 2 × 102 times lower than the maximum allowable level of inorganic Cu2+ in drinking water (1.3 ppm, ∼20 µM) permitted by the EPA (Environmental Protection Agency), and the sensing detection of Cu2+ ions was reversible. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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