Conclusion
In summary, we have developed a novel colorimetric chemosensor 1 based on coumarin derivative which exhibits highly selective and sensitive recognition toward Ni2+ ion both in solution and on paper-made test kits. The recognition of Ni2+ ion gave rise to color change from colorless to pink in ethanol which was clearly visible to the naked eye. The detection limit of Ni2+ ion is as low as 0.5 μM in solution by the “naked eye” without resort to any spectroscopic instrumentation. Based on the colorimetric response of 1 to Ni2+ ion, test strips containing 1 were fabricated, which also exhibits an obvious color change from colorless to red only with Ni2+ ion aqueous solution. This is, to the best of our knowledge, the first reported example of a colorimetric chemosensor capable of detecting Ni2+ ion. We believe that this sensor, with sensitive and selective naked-eye responses can be used for many practical applications in chemical, environmental and biological systems.
Conclusion
In summary, we have developed a novel colorimetric chemosensor 1 based on coumarin derivative which exhibits highly selective and sensitive recognition toward Ni2+ ion both in solution and on paper-made test kits. The recognition of Ni2+ ion gave rise to color change from colorless to pink in ethanol which was clearly visible to the naked eye. The detection limit of Ni2+ ion is as low as 0.5 μM in solution by the “naked eye” without resort to any spectroscopic instrumentation. Based on the colorimetric response of 1 to Ni2+ ion, test strips containing 1 were fabricated, which also exhibits an obvious color change from colorless to red only with Ni2+ ion aqueous solution. This is, to the best of our knowledge, the first reported example of a colorimetric chemosensor capable of detecting Ni2+ ion. We believe that this sensor, with sensitive and selective naked-eye responses can be used for many practical applications in chemical, environmental and biological systems.
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