Study On Design & Adjustment To Pore Structure Of MOCPs

Material science is developing swift at present .Appearance of many new types of materials bring unconventional activity in this research field. Especially, the new functional materials which can store gases effectively are absorbing more attention in an era of sources crisis. Metal-organic coordination polymers (MOCPs), also called metal-organic framework (MOFs), belong to pore cystal materials, displaying a potential for the storage of fuel gases, like hydrogen, methane, and natural gas. The aperture structure of MOCPs is similar to zeolite framework. Commonly, people utilize metal ions and multidentate organic ligands to synthesize MOCPs. In a word, MOCPs have potential applications in shape-selective, chiral catalysis, adsorption, separation, gas storage, molecule recognition, photoelectrics, biological simulation, tiny reactor, clinic diagnosis and treatment.It is a great challenge to design or adjust the aperture of porous materials in the research field in order to synthesize porous functional materials with special structure. In the paper, we choose, respectively, terephthalic acid (H2BDC), nicotinic acid, isonicotinic acid, and fumaric acid as organic ligands, and bivalent metal ion, Cd2+ as the central ions to synthesize hydrothermally a series of MOCPs, in order to demonstrate the adjusting roles of organic ligands in MOCPs characteristics and adopt Cd2+ and Zn2+ to coordinate with terephthalic acid (H2BDC), respectively to verify the roles of metal ions in the MOCPs construction. The influence of main experimental conditions were investigated experimentally on the formation of MOCPs, such as building molecule concentrations, pH values, the dosage of NH3?H2O, and temperature. The samples were characterized by powder X-ray diffraction, single crystal X-ray diffraction, FTIR, TGA/DTA and Brunauer-Emmett-Teller(BET) surface-area measurements for their crystal structure, organic functional groups, thermal stability of their frameworks, BET surface area and pore size didstribution, separately. Furthermore, the crystal solubility was also determined in commonly used solvents and aqueous solutions with fifferent pH values. In addition, author has explored the application of the MOCP from (C12H16N2O8Cd)n in molecular recognition with the polymer.The results showed that pore structure of MOCPs could be tailored with organic ligands or metal ions.