Synthesis And Characterization Of Novel Ligands Four Toothed Metal Organic Framework Based Compounds, And Properties

As a new type of porous material, metal organic framework has been developing at a surprising speed due to their novel structures and potential applications in gas storage, ion exchange, catalysis, sensor and drug delivery. In this thesis, three isostructural metal organic frameworks Co2(TCS)(4,4’-bipy)·H2O (1), Cu2(TCS)(4,4’-bipy)·H2O (2), Ni2(TCS)(4,4’-bipy)·H2O (3) were synthesized by reactions of the tetrahedral carboxylic acid ligand tetrakis(4-carboxyphenyl) silane (TCS) with CoCl2·6H2O, Cu(NO3)2·6H2O and Ni(NO3)2·6H2O respectively and they were fully characterized. They were found having two-fold interpenetrated,3D porous structures, as well as good thermal and water stability. The hydrogen storage capacities of1-3under1.6bar and77K were in the order of1(Co)>3(Ni)>2(Cu). The hydrogen adsorption enthalpy of3was determined to be16.8kJ/mol, which to the best our knowledge is the highest. In chapter3, a new tetrahedral pyrimidine ligand4-(4-pyrimidyl)phenyl)methane(PMPM) was synthesized. A three-fold interpenetrated,3D metal organic framework Zns(NO3)16(PMPM)5(4) with novel topologies was synthesized by reactions of PMPM with Zn(II). It was fully characterized and its fluorescence property was investigated. It has good thermal and water stability and didn’t decomposed until350℃. This metal organic polymer exhibits ligand based photoluminescence and the main emission band is about400nm. In chapter4, three metal organic frameworks were synthesized by reactions of a semirigid hexadentate carboxylic acid ligand(5,5’,5"-(1,3,5-triazine-2,4,6-triyl)Tris(azanediyl)triisophthalate)(TATAT) with Co(II), Ni(II) and Cd(II), however, the crystal structures of the three compounds were not obtained.