Research On Catalytic Property And Synthesis Of Metal-Organic Coordination Polymers

Mimic enzyme systems are always hotspots scientists study. Some artificial enzymes with different catalytic properties have been designed based on the elementary principles of biochemistry, molecule biology, inorganic chemistry, polymer chemistry, and computer chemistry. In this paper, approaches to synthesis, characterization and investigation of catalytic property are investigated for a class of promising functional porous materials arising recently, catalytic Metal-Organic Coordination Polymers (cMOCPs).As a novel enzyme mimic systems, cMOCPs display an attractive potential in catalysis. Currently, most workers focus on the MOCPs synthesis, but know little about their catalytic properties, and have not mentioned to the concept of cMOCPs mimic enzyme. As for the synthesis methods, most people use hydrothermal synthesis in Teflon-lined autoclave. But it is low in output and usually takes a long period time. So it is very important in practice to synthesize cMOCPs in milder conditions.In the paper, three different multidentate carboxylic acid ligands were used to combined with as Cd(Ⅱ), respectively, resulting in three MOCPs single crystals with different structures with a low temperature hydrothermal synthesis method. The effects of concentration of building molecules, pH values, ammonia usage, temperature and coolimg rates on crystal formation were studied experimentally and explored theoretically. The samples were characterized with IR spectra to affirm the organic groups in the frameworks, single-crystal X-ray diffraction to determine the crystal structure and composition of frameworks, N2 adsorption isotherms at low temperature to measure the specific surface area and pore size distribution, and with TGA/DGA analysis to scale the thermal stability. Furthermore, dissolution properties and the catalytic property of MOCP were explored.We found that above MOCPs single crystals could be hydro-thermally synthesized in an ammonia solution at no more than 100℃for eight hours. And at the same time we experimentally discovered some synthesis rules controlling crystal formation. The synthesized MOCPs are stable in heat, acid, alkali and commonly used solvents. Even one of MOCPs after being activated became a semiconductor photo-catalyst, which could be used to treat polluted water.