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A multi-hydroxyl Schiff-base derivative, N-2′-hydroxyl-1′-naphthyl methylene-2-amino phenol (HNMAP), was synthesized and characterized by FTIR, 1H NMR and UV–vis spectroscopy. It was noted to find there was great effect for solvent and pH on the UV–vis spectroscopy of HNMAP. Especially, some metal ions could make its UV–vis spectra changed regularly with different time-resolved effects. For example,...
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