Journal
NEW JOURNAL OF CHEMISTRY
Volume 46, Issue 33, Pages 16025-16034Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2nj03144b
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Funding
- Govt. of West Bengal, India [376(Sanc.)/ST/P/ST/9G-16/2013]
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A hydrazine-derived sensor has been synthesized for the detection of metal ions. It shows high selectivity and sensitivity towards Al3+ and Zn2+ ions in aqueous DMF media. The sensor forms a 1:2 coordination complex with the metal ions and can act as a reversible chemosensor. It also demonstrates potential application in molecular logic functions.
A hydrazine-derived bis(2-hydroxybenzylidene)-[1,1'-biphenyl]-2,2'-dicarbohydrazide (sensor 1) has been synthesized and its sensing properties toward metal ions have been demonstrated using simple UV-visible spectroscopy, fluorometry and visible color change techniques. The sensor 1 showed high fluorescence selectivity and sensitivity toward Al3+ and Zn2+ ions in aqueous DMF media. The fluorescence intensity of 1 increases in the presence of Al3+ at 458 nm and in the presence of Zn2+ at 478 nm. Visual color change under 350 nm UV light exhibits a bluish-white and bluish-yellow fluorescence light in the presence of Al3+ and Zn2+ ion, respectively. The ESI-MS and Job's plot analysis show that sensor 1 and metal ions formed a 1: 2 coordination complex. A fluorescenct switch based on the control of Zn2+ and EDTA proved that sensor 1 could act as a reversible chemosensor. However, on the addition of the EDTA into 1-Al3+ complex, there was no spectral change and naked-eye color change was observed. The sensing behavior was also studied with the molecular logic function of the AND gate. Furthermore, Test Kits coated with sensor 1 showed the successful selective detection of Al3+ ion under UV light.
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