Synthese, Crystal Structures And Properties Of Metal-Organic Coordination Polymers Based On Pyridine Carboxylic Acid Ligands

Metal-organic coordination polymers (MOCPs) have attracted much attention of chemists all over the world because of their fascinating structural diversity and potential applications in many fields, such as gas storage, adsorption and separations, catalysis, magnetism, optical, etc. In this paper, we choosed pyridine carboxylate ligands, 5-(4-(2,6-di(pyridin-4-yl)pyridin-4-yl)phenoxy)isophthalic acid (H2L) and 5-(4-(2,6-di(pyrazin-2-yl)pyridin-4-yl)phenoxy)isophthalic acid (H2L’), to solvothermally react with metal ions, and obtained seven new MOCPs successfully. They are shown as follows: [Sr2L2(H2O)3]n·5.5nH2O(1) [Ba2L2(H2O)3]n·5.5nH2O(2) [NiL(H2O)n·nH2O(3) [CdL(phen)]n(4) [MnL’]n·0.5nH2O(5) [CaL’(H2O)2]n·nH2O (6) [CuCl2 (H2L’]n·1.75nH2O (7)The crystal structures of MOCPs 1-7 were measured by single crystal X-ray diffraction analyses, and other properties were characterized by elementary analysis, IR analysis and thermogravimetric analysis. The luminescent properties of MOCPs 2,4,6 were also studied. The successful syntheses of the series of tilte MOCPs, not only enriched the types of MOCPs, but also provided necessary experimental basis for the study of the syntheses of MOCPs and the relationship between structures and properties.