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A novel ratiometric and colorimetric cobalt(II) chemosensor (HL) based on coumarin platform has been synthesized. It displayed a remarkable (44nm) red-shift in the absorption spectra upon reaction with Co2+, which is easily observed from yellow to red by the naked-eye. Co2+ could be quantitatively detected in the range of 0–10μM by both normal and ratiometric absorption spectrometry methods. The detection...
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