Synthesis, Structures And Properties Of Carboxylic Acids Metal-organic Framework Coordination Polymer

Metal-organic frameworks complex is represented by connecting two or moremetal ion/ion clusters with oxygen, nitrogen and other polydentate organic ligand.Most of such complexes have greater porosity, good chemical stability, high surfacearea, structural diversity and tailoring and other advantages,which has a good prospectin catalysis, gas storage, sensing, bio-imaging and drug delivery, etc. In this paper, theamide,schiff bases modified organic ligands as raw material, the hydrothermalsynthesis was proposed to prepared a series of novel metal-organic frameworkscomplexes.Their structure and properties are characterized by infrared analysis,elemental analysis, thermal analysis and X-ray single crystal diffraction analysis. Thecontents are divided into the following three parts:1. Synthesis and characterization of a multi-functional organic ligands. In thischapter,1,3,5-tri[4-benzoic acid]-benzenetriyl-tris(formamide)[H3L] with C3symmetrical in the amide modified multifunctional organic ligands as well as theSchiff base modified organic ligands for bis-[4-benzoic acid]-benzylideneamino[TBSB1] and di-[4-benzoic acid]-o-toluene methyleneamino [TBSB2] weresynthesized. Their structure, thermal stability and fluorescence properties werecharacterized by infrared analysis, X-ray single crystal diffraction analysis, NMR andfluorescence spectrometer. TGA showed that three organic ligand frameworkscollapse temperature are higher, complexes have a certain thermal stability.Fluorescence analysis showed that organic ligand H3L has good fluorescenceproperties and the ligands for TBSB1and TBSB2are green emission,which have aapplication in preparing green polymer material.2. Conducting a research for MOFs containing the amide modified organicligands. Under the solvent hydrothermal synthesis conditions, organic ligand H3L,rare earth chloride and4,4’-bipyridine were prepared rare earth complexes ofSm/Eu/Tb/Dy/Ho/Tm/Lu-L,which Sm-L crystal structure was obtained. Resultanalysis shows that based on1-(2-2)-(1-1)-2-6coordination mode, organicligand H3L and the metal Sm atoms are linked together to construct (8,4) connected to a two-node3D framework structure. Series of rare earth complexes exhibited betterthermal stability, rare earth complexes of Sm/Eu/Tb/Dy-L have excellent fluorescenceproperties, meanwhile, fluorescent properties of rare earth complexes Ho/Tm/Lu-Lare poor,which generates fluorescence intensity quenching effect on organic ligandH3L.3. Conducting a research for MOFs containing the Schiff base modified organicligands. Under the condition of solvent hydrothermal synthesis, TBSB1/2organicligand and metal salts were synthesized13kinds of MOFs. Their structures andproperties were characterized by UV-vis spectroscopy, thermal gravimetric andfluorescence spectra. Series of complexes exhibited a certain thermal stability, the badfluorescence properties due to quenching effect.