The sensing properties of naphthaldimine-glucofuranose conjugates 1 and 2 towards metal ions were investigated by 1 H NMR titration, FTIR, absorbance, and uorescence spectroscopic methods. The absorbance and uorescence studies indicated that compound 1 formed coordination with Fe 2+ and Cu 2+ ions in DMSO through color changes yellow to brown and colorless, respectively. The Job's plots using absorbance data showed metal-ligand binding ratio is 1:1 for both cases. The formation of 1-Fe 2+ and 1-Cu 2+ complexes have been analyzed by absorption and emission spectroscopy, high-resolution mass spectrometry (HRMS) data, FTIR, 1 H NMR titration experiment, and DFT calculations. The detection limits of naphthaldimine sugar conjugate 1 towards Fe 2+ /Cu 2+ were calculated from UV-vis and uorescence data according to the standard method. The sugar-naphthaldimine conjugate 2 has been used to establish the binding mode of 1 with Fe 2+ or Cu 2+ ions in DMSO.
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