Synthesis, Structure And Characterizations Of Metal Coordination Compounds With Several O-containing Ligands

Materials are the precursor and foundation of social development, technological advancement and the modern civilization. Metal organic coordination polymer is a new type of functional material that the structure could be tailored and modified through functionalization, which has more and more significant impacts in recent years. In these studies, by selecting the specific functional center metal ion and some special ligands, we could obtain a number of functional metal complexes with an awesome tempting prospect. These prospects include the molecular magnets, nonlinear optics, gas adsorption, drug delivery and other fields. However, the process of synthesis will be affected by many factors, such as reactants, solvents, temperature, pH value, etc. Thus, it’s difficult to synthesize some materials with new structure and properties as we expected.In this thesis, we chose solvent evaporation. Then, we selected O-containing ligands with multiple coordination modes and transition metal ions or lanthanum metal ions to synthesize some new structure complexes. These compounds have been characterized by single crystal X-ray diffraction, elemental analyses, and IR spectroscopy.The main research details and results are as follows:1. Two dysprosium metal organic coordination compounds, [Dy₂L₄（HL）₄（H₂O）₂]·（ClO₄）·2（H₂O）₂（1） and [Dy₂L₆（C₂H₅OH）]·H₂O（2）, have been synthesized and characterized by IR spectrum, X-ray single-crystal diffraction. Because of the large magnetic anisotropy of the central metal Dy³⁺, the detailed magnetic properties of the two compounds have been investigated. Both compounds contain the same ligands 2-methyl-8-hydroxylquinolinate（HL）, while the different coordination modes lead to quite different coordination environments. Magnetic measurements reveal that the different coordination modes of the ligand lead to a difference in the dynamic magnetic behaviors. Compound 1 with a central symmetry structure, does show a magnetic relaxation effect and single-molecule magnet behavior, while no out-of-phase signals are observed in compound 2.2. Two metal-organic coordination polymers, [Ni（CMTB）（4, 4’-bipy） H₂O]·Cl（3） and Co（CMTB）（4）,（CMTB = 4-[（carboxymethyl）thio]-benzoic acid）, was synthesized under solvothermal condition ligand as 4-[（carboxymethyl）thio]-benzoic acid and 4,4’-bipyridine. Both compounds are characterized by single crystal X-ray diffraction, IR spectroscopy and magnetic properties of compound 3. Experimental results show that compound 3 is one dimensional structure with paramagnetic property. Nevertheless, compound 4 is two dimensional structure.3. A new complex [Cu（H₂O）₂（SO4）（phen）]（5）,（phen=1,10-Phenanthroline monohydrate） was synthesized under solvothermal condition ligand as 2-[（carboxymethyl）thio]-benzoic acid and 1,10-Phenanthroline monohydrat. Experimental results show that it is a one dimensional structure and 2-[（carboxymethyl）thio]-benzoic acid’s function are modulating pH of the solution.