A New Fluorescent Sensor for Fe3+ Based on Glycoluril Molecular Clip

The application of fluorescent method to metal ions detection features high sensitivity, simple operation and real-time monitoring. A 2,7-dihydroxynaphthalene-functionalized dimethyl glycoluril (called clip 1) was synthesized, using a relatively simple method. And it is fully characterized by H-1 NMR, C-13 NMR, HR-MS and single crystal X-ray diffraction. The recognition properties of molecular clip 1 were analyzed systematically toward several metal ions using fluorescence spectroscopy, and it was found that molecular clip 1 is selective and sensitive to Fe3+. At the same time, the clip 1 shows good anti-interference ability when other metal ions existed. The limit detection of Fe3+ is 3x10(-7)M. The fluorescence of clip 1 was quenched apparently by Fe3+, which was speculated to be caused by ligand-metal charge transfer mechanism (LMCT). As a new fluorescence probe for Fe3+ ion, it may expanded the application of glycoluril molecular clips.