Highly Fluorescent Cadmium Based Metal-Organic Frameworks for Rapid Detection of Antibiotic Residues, Fe and CrO Ions.

Here, two novel 3D Cd(II)-MOFs, [Cd··()·2DMF] and [(CdO)··] (denoted as and , = 9,10-bis(-benzimidazolyl)-anthracene, = 1,3,5-tris(4-carboxyphenyl) benzene, = 1,3,5-benzenetricarboxylic acid, CUST = Changchun University of Science and Technology), were synthesized by solvothermal conditions. Both and are 3D (3,8)-c topological nets with the same point symbol of {4}{4·6·8}. PXRD and TGA analyses prove that and have good structural stability and thermal stability. On the basis of the high fluorescence characteristics, the results of fluorescence sensing experiments show that and can be used as multifunctional chemical sensors to achieve rapid fluorescence quenching response to antibiotic residues, Fe and CrO ions at a much lower concentration. Furthermore, the possible mechanisms of fluorescence quenching in the sensing process were systematically studied by PXRD, UV-vis, fluorescence decay lifetime, and density functional theory.