| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1303984 | Inorganic Chemistry Communications | 2012 | 4 Pages |
A new coumarin based colorimetric nickel sensor 1 with high selectivity and sensitivity toward Ni2+ ion was reported. The absorption maximum of 1 shows a large red shift from 341 nm to 540 nm (Δ = 200 nm) in the presence of Ni2+ ion, and the resulted color change from colorless to pink upon addition of Ni2+ is very easily observed by the naked eye, while other metal ions, such as Zn2+, Cd2+, Cu2+, Fe3+, Ag+, Pb2+, alkali metal and alkaline earth metal cations do not induce such a change. By the “naked eye”, the detection limit of Ni2+ is as low as 0.5 μM in solution, which is lower than the current American Environmental Protection Agency (EPA) standard for drinking water. As far as we are aware of, this is the first reported colorimetric chemosensor capable of detecting Ni2+ ion.
Graphical abstractA novel highly selective colorimetric sensor 1 for Ni2+ ion has been reported: (a) absorbance spectra of chemosensor 1 (20 μM) with increasing concentrations of Ni2+ ion in ethanol. Inset: the absorbance at 535 and 341 nm as a function of Ni2+ ion concentration. (b) Photographs of the solution 1 (10 μM) after addition of different concentrations of Ni2+ ion.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A novel coumarin based colorimetric nickel sensor 1 was synthesized. ► Compound 1 shows 200 nm red-shift in absorption spectrum upon coordination with Ni2+ ion. ► The resulted color change from colorless to pink upon addition of Ni2+ ion is easily observed by the naked eye. ► Other metal ions do not interfere. ► This is the first reported colorimetric chemosensor capable of detecting Ni2+ ion.
