Synthesization And Luminescent Sensing Investigation Of Metal-Organic Frameworks

Metal-Organic Frameworks can be readily self-assembled by the coordination of metal cations/clusters with organic linkers. This intriguing architectural form has led to structural rigidity, high porosity, and geometrically well-defined structure. These properties further imply a variety of potential applications, such as gas storage, separations, catalysis, magnetism and sensing. There has been extensive interest in MOFs owing to their important properties. Zeolitic Imidazolate Framework-8, with exceptional chemical and thermal stability, is assumed to play a role in sensing study.We present a rare example of Zeolitic Imidazolate Framework-8 (ZIF-8):Zn(MeIM)2·(DMF)·(H2O)3, as luminescent probes with multi-function sensitivity to detect metal ions and small molecules. Our results show that the luminescence intensity of ZIF-8 is strongly sensitive to Cu2+ and Cd2+ ions and small molecules-acetone. In particular, the luminescence intensity of desolvated ZIF-8 proportionally decreases to the concentration of Cu2+, while increases to the concentration of Cd2+ owing to the recognition of element-imidazole nitrogen sites. The luminescence intensity increases gradually with the increase of amounts of acetone in the standard desolvated ZIF-8-emulsions. The quenching effect may be caused by a weak binding between the Cu2+ and imidazole nitrogen atoms according to the XPS investigation. These results reveal that the ZIFs might be a good luminescent sensor for metal ions and small molecules.Meanwhile, we investigated UMCM-1 and LMOF as luminescent probes to detect metal ions and small molecules. Our results show that the luminescence intensity of LMOF is sensitive to Cd2+ ions. UMCM-1 and LMOF are both sensitive to solvent molecules.