A “naked eye” and ratiometric chemosensor for cobalt(II) based on coumarin platform in aqueous solution

• A “naked eye” and ratiometric chemosensor for cobalt(II) has been synthesized and fully characterized.
• Co2 + can be quantitatively detected by both normal and ratiometric absorption spectrometry methods.
• The detection limit of HL for Co2 + detection was as low as 0.31 μM.

A novel ratiometric and colorimetric cobalt(II) chemosensor (HL) based on coumarin platform has been synthesized. It displayed a remarkable (44 nm) 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 0–10 μM by both normal and ratiometric absorption spectrometry methods. The detection limit of HL for Co2 + detection was as low as 0.31 μM.

A ‘‘naked eye’’ and ratiometric chemosensor HL for Co2 + ion based on coumarin platform has been synthesized and fully characterized. The binding structure between HL and Co2 + was given by Job’s plot, IR spectrometry, MALDI-TOF mass spectra.Figure optionsDownload as PowerPoint slide