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Research Paper | March 5, 2022

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Schiff base fluorescent-on ligand synthesis and its application for selective determination of manganese in water samples

Maria Sadia, Jehangir Khan, Robina Naz, Rizwan Khan

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J. Bio. Env. Sci.13(2), 76-89, August 2018

DOI: http://dx.doi.org/10.12692/ijb/20.2.1-20

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Manganese contamination of water is becoming a serious health concern in recent years as even at lower levels of exposure it is toxic for living organisms. Manganese can bind to functionally important domains of biomolecules and thereby inactivates them. Therefore, a simple, sensitive and convenient method based on Schiff base fluorescent turn-on ligand for determination of trace amount of manganese was developed in real water samples. The novel Schiff base fluorescent turn-on ligand of 2-hydroxy-1-naphthaldehyde and 2-methoxybenzhydrazide was synthesized and characterized using X-Ray Diffraction (XRD), Proton nuclear magnetic resonance (1HNMR) and Fourier Transform Infrared Spectroscopic (FTIR) techniques. The ligand shows high selectivity and sensitivity for manganese over other metals studied with 3.8 ×10-6 M limit of detection. Chelation with manganese resulted in maximum enhancement in fluorescence intensity at pH 10 with 2:1 binding ratio of ligand to manganese from Job’s plot analysis and with 4×106 M-1 association constant from Benesi–Hildebrand plot.


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Schiff base fluorescent-on ligand synthesis and its application for selective determination of manganese in water samples

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