Abstract
Easy to prepare fluoride ion sensors bearing OH and NH groups as binding sites and nitrophenyl group as a chromophore [2-[(4-nitrophenylimino)methyl]-4-methylphenol (1), 2-[(4-nitrophenylamino)methyl]-4-methylphenol (2), 2-[(2,4-dinitrophenylimino)methyl]-4-methylphenol (3) and 2-[(2,4-dinitrophenylamino)methyl]-4-methylphenol (4)] were synthesised and characterised. The visible colour changes, the UV–vis and 1H NMR spectral changes towards anions were studied. The sensing ability of the receptor depends on the presence of electron-withdrawing group attached to the receptors and extended conjugation in the receptor framework and the order of the sensing ability is found to be 3>1>4>2 based on binding constant.
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