Moisture-stable/Water-stable Metal-organic Frameworks: Syntheses And Applications

During the last two decades, metal-organic frameworks (MOFs) have attracted widespreadattention duing to their structural diversity and potential applications in many fields. However,some of the previously reported MOFs materials are moisture sensitive, which has beenrecognized as an imperative issue on the way to their practical applications. In searchingmoisture-stable MOFs compounds, we focus on the phosphonate monoester as ligand. Here, wesuccessfully synthesized six phosphonate-monoester-based MOFs with high moisture stability.Moreover, We also employed two previously reported Fe(III)-MOFs material as catalyst to detectH2O2and vitamin C in solution.The main content of this thesis is divided into the following two parts:1.) We used4,4’-biphenyldiphosphonate bis(monoethyl ester)(H2L), and auxiliary N-donorligand, bis(imidazol-1-yl)methane (BIM) or1,3,5-tri(1H-imidazol-1-yl)-benzene (TIB) to affordsix phosphonate-monoester-based MOFs materials: from one-dimensional (1D) chain[Cd(L)(BIM)(H2O)2](1), to two-dimensional double layered [Cd(L)(BIM)]7H2O (2) and layered[Co(L)(TIB)(H2O)]7H2O (3), and to three-dimensional porous frameworks,[M(L)(TIB)(H2O)2]6H2O (M=Cd for4, Co for5, and Cu for6). It is noted that the coordinationbetween ligand and metal ions only gives1D chain in all six MOFs, while the introduction of anauxiliary N-donor ligand extends the1D chain to different framework dimensionalities.Remarkably, these MOFs based on phosphonate monoester linker with ethyl group protection arehighly moisture stable.2.) We used two previously reported water-stable Fe(III)-based MOFs, MIL-68and MIL-100,which are found to be able to exhibit intrinsic peroxidase-like activity for colorimetric biosensing,They are able to behave as efficient peroxidase mimics to catalyze the oxidation of differentperoxidase substrates accompanying with the significant color change in the solution. With thesefindings, a simple and sensitive colorimetric assay to detect H2O2and vitamin C has beenestablished.