Colorimetric Detection of Co~(2+), Cu~(2+), and Zn~(2+) by a Multifunctional Chemosensor in Aqueous Solution

摘要

A novel multifunctional colorimetric sensor HMBC ((E)-3-((2-hydroxy-3-methoxybenzylidene)amino) benzofuran-2-carboxamide), based on 3-aminobenzofuran-2-carboxamide and 2-hydroxyl-3-methoxylbenzal dehyde, was designed and synthesized. The chemosensor HMBC could sense Co2+, Cu2+, and Zn2+ by color changes from colorless to yellow. Limits of detection (0.38, 0.41, and 1.02 |iM) of HMBC for Co2+, Cu2+, and Zn2+ were much lower than the New Jersey Department of Environmental Protection (NJDEP) standard (1.70 uM) for Co2+ and the WHO guidelines (31.5 uM and 76 uM) for Cu2+ and Zn2+. Significantly, HMBC could be applied for the quantification of Co2+, Cu2+, and Zn2+ in real samples. The sensing process of HMBC for Co2+, Cu2+, and Zn2+ was well demonstrated by 1H NMR and UV-Visible titrations, Job plots, theoretical calculations, and ESI-mass spectroscopy.