Synthesis And Properties Of The Coordination Polymers By Rare-earth, Transition Metal And Carboxylic Acid Ligands

Recently, metal-organic frameworks(MOFs) as novel metal materials havereceived great attention. Building MOFs are the construction of metal or metal nodeswith organic ligand. The structure and functional surface can cause variety of MOFs,such as gas adsorption, chemical sensors, biomedical applications and catalysis. Thecontinuing interest in this area is also due to their fascinating structures and manypossible metal ligand coordination, as well as the aforementioned properties tunablethrough the variation of building blocks and reaction conditions. In general, mostMOFs have been reported mainly use carboxylic acid ligands with material ions toform porous coordination polymers. So in this paper we selected three organic ligands:4,4’- Methylenebis(3-hydroxy-2-naphthoic) acid(H2pam),[1,1’-Biphenyl]-2,4’,5-Tricarboxylic acid(H3L) and5,5’,5’’-((1,3,5-triazine-2,4,6-triyl)tris(azanediyl))triisophthalic acid(H6TDPAT).These coordination polymers were characterized by X-ray single-crystal diffraction,infrared spectra, elemental analysis, XRD, thermogravimetric analysis, and wediscussed their structural characteristics and properties. This paper includes thefollowing five chapters:In the first chapter, we introduced the current progress of metal organiccoordination polymer and the significance and the progress made in this paper.In the second chapter, we choice H2 pam and Ln(NO3)3·6H2O(Ln=Tb, Dy)synthesized two lanthanide-organic frameworks with the formulas[Ln4(pam)4(OH)4(DMF)3(H2O)3]·DMF·3H2O [Ln=Tb(1), Dy(2), H2 pam =4,4’-Methylenebis(3-hydroxy-2-naphthoic) acid]. Topologically, the two were newtopology with the Sch?fli symbol of(36.48.59.65). For 2, the {Dy III4} cubane-shapedcore exhibits single-molecule magnet associated slow magnetization relaxationbehavior below 5 K. 2 also exhibits catalytic activities toward the cyanosilylationreaction under solvent-free conditions.In the third chapter, the hydrothermal reaction of Cd(NO3)2·4H2O with H3 L lead toyield a colorless crystals Cd3(L)2(H2O)4(3). Three Cd(II) are connected by L ligandsto form a 3D framework. Then, 3 exhibits strong ?uorescent emissions in the solidstate at room temperature.In the fourth chapter, [Mg9(TDPAT)2(m2-O)6(H2O)9]·3H2O(4) has beensuccessfully constructed by5,5’,5’’-((1,3,5-triazine-2,4,6-triyl)tris(azanediyl))triisophthalic acid(H6TDPAT) andMg(NO3)2×6H2O under solvent conditions. Single-crystal X-ray analysis reveals that 4crystallized in the Fm-3m space group, 4 crystallized in the Cubic space group.In the conclusion, we have summarized the structures of the four Metal-organicframeworks.