A new dual responsive colorimetric and fluorescent turn-off sensor for Fe and Cu was designed and synthesized based on quinoxaline derivative by a simple procedure reaction. 2,3-bis(6-bromopyridin-2-yl)-6-methoxyquinoxaline (BMQ) was fabricated and characterized using ATR-IR, C and H NMR, and Mass spectroscopy. The interaction of BMQ with Fe caused a significant color change from colorless to yellow. The sensing complex BMQ-Fe with high selectivity was described to be 1:1 by the molar ratio plot. In this experiment, iron was detected by naked-eye using a recently synthesized ligand (BMQ). This color change was unexpectedly observed in iron-overloaded plasma, which had previously been admitted by AAS (Atomic Absorption Spectroscopy). Normal plasma, however, did not exhibit this color change. Interestingly, Cu ions cause a quench at the local emission around 565 nm. On the other hand, receptor-binding selectivity for Cu over a wide linear concentration range was observed through changes in the emission spectra. BMQ-Cu was characterized to be 1:1 by the Job's plot. The emission intensity of BMQ-Cu complex was balanced within only 1 min. various mineral water samples were analyzed for detecting Cu. The results show the great potential of the developed probe BMQ for the sensing of Cu ions in mineral and drinking water samples.
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