Water-Stable Eu 6 -Cluster-Based fcu-MOF with Exposed Vinyl Groups for Ratiometric and Fluorescent Visual Sensing of Hydrogen Sulfide

Detection of H S in the biological system has attracted enormous attention in recent years. In this work, a new vinyl-functionalized metal-organic framework (MOF), [(Me NH ) ] [Eu (μ -OH) (BDC-CH═CH ) (H O) ] (Eu-BDC-CH═CH , BDC-CH═CH = 2-vinylterephthalic acid), was synthesized under solvothermal conditions. The vinyl groups in the ligands can not only modulate the "antenna effect" of the ligand on Eu ions but also serve as an exposed reactive site to allow for the quantitative detection of H S by Eu-BDC-CH═CH . The ratiometric fluorescent probe has the advantages of water stability, acid-base stability (pH = 2-11), fast response (