Abstract
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, a real-time and multi-wavelength response to Fe2+ at 520 nm, 466 nm and 447 nm and a quite slow one about 26 min to Fe3+ at 447 nm and 466 nm, respectively. Under the optimized conditions, the changes in the corresponding absorption intensities at above wavelengths were in proportion to cFe2+ or cFe3+ during respectively partitioned linear ranges, which realized to quantitatively detect Fe2+ or Fe3+ with a large linear range more than two orders of magnitude. A 1:1 complex mode for HNMAP-Fe2+ and 1:2 for HNMAP-Fe3+ were proposed from UV–vis spectral titration and Job's plot. HNMAP would be a potential sensor for colorimetric detection of Fe2+ and Fe3+ in practice.
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