| Metal-organic frameworks (MOFs) assembled from metal ions and multitopic organic moieties are a new type of crystalline porous materials, which have attracted much interest recently. Owing to their uniform but tunable cavities, permanent porosity and tailorable chemistry, MOFs have being considered as promising candidates in extensive applications, ranging from strategic storage and separation of gases to catalysis chemical sensing and drug delivery. We have focused our study on the synthesis, structures and multifunctional properties of MOFs with charming topology structures. In this dissertation, we have prepared 10 new MOFs by using different geometric aromatic carboxylic acid, neutral bridging organic ligands and transition metal ions, and analyzed their structures as well as explored their multifunctional properties, including hydrogen storage, gas adsorption, and fluorescence detection.This dissertation including five chapters, some concepts about MOFs, synthesize method and influence have been introduced in the first chapter. In addition, the research development of porous and fluorescent MOFs also have been introduced.The second chapter:two three-dimensional microporous compounds, Cu6(BTTC)4(H2O)6·xS (compound 1) and [(CH3)2NH2]3[(Cu4Cl)3(BTTC)8]·yS (compound 2, H3BTTC=Benzo-(1,2;3,4;5,6)-tris(thiophene-2'-carboxylic acid), S represents non-coordinated solvent molecules), have been solvothermally synthesized and characterized, both of which are based upon truncated-octahedron subunits and contain uniform nanosized cavities, but exhibit different topological frameworks. Compound 1 demonstrates high adsorption enthalpies for H2 and CO2 gas molecules, stemming principally from the presence of the exposed metal Cu(II) sites on the pore surface. In particular, activated compound 1 shows high-efficiency for the separation of energy-correlated molecules, including CO2 over N2 and CH4 under ambient conditions.The third chapter:four MOFs, [Co2(BCPBA)2(bimb)2(DMA)2(H2O)2]n (compound 3), [Mn3(BCPBA)2(DMA)2(H2O)2]n (compound 4), [Cu3(BCPBA)2(bimb)3(DMA)3 (H2O)5]n (compound 5) and [Cd2(BCPBA)2(bimb)2(DMA) 2(H2O)]n (compound 6, H3BCPBA=3,5-bis(4'-carboxylphenoxy)benzoic acid, bimb=4,4'--bis(1-imidazolyl)biphenyl), have been solvothermally synthesized and characterized. All of them are three-dimensional compounds. In particular, compounds 3 and 6 are heterogeneous isomorphism, and in their structure one of the H3BCPBA ligand's carboxyl is free. Compound 6 is a three-dimensional network, which shows strong fluorescence intensity, can detect nitrobenzene compounds, organic small molecule acetone, transition metal ion (Cu2+, Ni2+), anion(Cr2O72-) and pesticide methyl parathion. Compound 6 may be one potential fluorescence detection material. Compounds 4 and 5 are porous MOFs, which shows high-efficiency for the separation of energy-correlated molecules, including CO2 over N2 and CH4 under ambient conditions.The fourth chapter:four MOFs, [Ni(4,2'-CBOB)2(bimb)2(H2O)]n (compound 7), [Ni(4,2'-CBOB)3(bimb)2]n (compound 8), [Co(4,2'-CBOB)3(bimb)2]n (compound 9) and [Cd4(3,4'-CBOB)6(bimb)4]n (compound 10,3,4'-H2CBOB=3-((4'--carboxybenzyl)oxy)benzoic acid,4,2'-H2CBOB=4-((2'-carboxybenzyl)oxy)benzoic acid), have been solvothermally synthesized and characterized. Compounds 7,8,9 have 2D network. In particular, compounds 8 and 9 are heterogeneous isomorphism. Compound 10 is a three-dimensional network, which shows strong fluorescence intensity, can detect nitrobenzene compounds, organic small molecule acetone, transition metal ion (Cu2+), anion(Cr2O72-) and pesticide methyl parathion. Compound 10 may be one potential fluorescence detection material.The fifth chapter:summarize for our research and mention the innovation points. In addition, the prospects for porous and fluorescent MOFs. |
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