This work introduces a thought-provoking design to develop a water-soluble chemical probe, sodium 4-hydroxy-3-((E)-((E)-((2-hydroxynaphthalen-1yl)methylene)hydrazono)methyl) benzenesulfonate (SW2) and it's analytical characterization for efficient detection and monitor of Cu2+ ions in a matrix of s-, d-, and f- metal ions in pure water. The water-stable molecular probe, SW2 in the presence of Cu2+ salts in pure water exhibits a fluorescence turn-off characteristic with a high detection limit, 3.8 µM, and irresistibly, holds a 4-cycle reversibility in the presence of sulphide ion without any significant loss of chemosensing efficiency. Spectroscopic and computational studies ensure the 1:1 complexation between SW2 and Cu2+ ions leading to the formation of SW2-Cu2+ chelate, inducing the dynamic quenching in the emission property for SW2 which subsequently reverts by the addition of S2- ion in water. Additionally, SW2-Cu2+ chelate was isolated in microcrystalline powder and the complexation was compelled with mass spectrometry and EPR analysis. Computational analysis reveals the remarkable reduction of the S0-S1 energy level for SW2-Cu2+ complex attributing the drastic quenching in the fluorescence intensity. Furthermore, SW2 is successfully applied to the detection of Cu2+ ions in tap and pond water. Interestingly, the probe is also effective for the determination of Cu2+ ions in the aqueous solution of a Cu-based fungicide (copper oxychloride), commercially available as Blitox in India evaluating the effectiveness of SW2 for real sample analysis.

You have access to this article

Please wait while we load your content... Something went wrong. Try again?