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A Novel Colorimetric and Fluorescent Anion Chemosensor Based on the Flavone Quasi-crown Ether−Metal Complex

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journal contribution
posted on 01.04.2004, 00:00 by Li-Li Zhou, Hao Sun, Hua-Ping Li, Hui Wang, Xiao-Hong Zhang, Shi-Kang Wu, Shuit-Tong Lee
The metal−ligand complex 1 ([Mg (L)] 2+) (or 2 ([Ca (L)] 2+)) was demonstrated to selectively bind HSO4- (or H2PO4-) over other anions by using UV−vis absorption and fluorescence spectroscopy. The studied complex exhibits the remarkable color change and fluorescence quenching upon introducing HSO4- (or H2PO4-) anion in acetonitrile. Both the mechanism and structure of the secondary complex of complex 1 with anion were proposed on the basis of theoretical computation.