Abstract
The reversible fluorescence sensor 1 has been reported for the discrimination of metal ions in aqueous medium after excitation at a higher wavelength. Sensor 1 showed specific sensing properties towards Cu2+ and Ni2+ in aqueous solutions of DMSO and CH3CN. The discrimination of Cu2+ and Ni2+ions was carried out by controlling the testing media. Sensor 1 exhibited high selectivity and excellent sensitivity (LOD: 0.17 µM for Cu2+ and 0.18 µM for Ni2+) towards Cu2+ and Ni2+ in two different analytical techniques (absorbance and fluorescence). The 1:1 complexation for both Cu2+ and Ni2+ was established from Job plots and ESI-mass spectra of the complexes. Model compound 2 and FTIR spectroscopy were used to know the binding mechanism of sensor 1 with Cu2+ and Ni2+ ions. Finally, DFT calculations were performed to establish the binding mode of 1 with Cu2+ and Ni2+.
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