Synthesis And Properties Of Metal- Imidazole Carboxylic Acid Framework Materials

As a class of porous functional materials, metal-organic frameworks(MOFs) are built from metal ions or clusters as connecting nodes and multidentate organic ligands as linkers. MOFs have been widely investigated as heterogeneous catalysts in many organic reactions. Compared with traditional heterogeneous catalysts, MOFs catalysts have following advantages:precisely determined crystal structures; rationally designable and tunable framework structures; designable and tunable functionalities; recyclable. We selectively studied the catalytic properties of some MOFs according to the structures and the active metal sites. The dissertation contains the following sections:We designed and synthesized seven novel MOFs through the self-assemble reactions of 5-(1H-imidazol-l-yl)isophthalic acid (H2L) and transition metal nodes (Cu2+, Ni2+, Pb2+, Co2+, Zn2+, Mn2+) by controling the crystal growth conditions (sovent, temperate, pH etc.). These compounds were characterized by single crystal X-Ray diffraction analysis, PXRD, IR, TGA and EA etc. Based on the structures and active metal sites in these compounds, we have selectively studied the stability and adsorbability of the compund 1 ([Cu2L(H2O)]·2Cl·2DMF·4H2O). We further studied it’s heterogeneous-catalytic property in cross dehydrogenative coupling (CDC) reaction. Detailed experiments have revealed that compound 1 has superior catalytic properties compared with the corresponding constituents and the famous MOF material HKUST-1.