Syntheses, Structures And Properties Of Coordination Polymers With Aromatic Dicarboxylates Modified By Fluorene

The conception of coordination polymers first appeared in the1960s. These hy-brid porous materials result from molecular self-assembly reactions between metal ions or clusters and bridging multidentade organic ligands. It is represent a unique class of crystalline open framework solids with unprecedented structures, diverse chemical composition, adjustable pores sizes, large surface areas and pore volumes. Coordination polymers are a fast growing subject, which have the advantages of both the inorganic materials and the organic materials, having potential practical applica-tions on photics, magnetism, catalysis and adsorption.Multicarboxylic ligands, strong and versatile in binding metal ions, have afforded a diversity of metal-organic frameworks.In this paper, we choose two bi-carboxylic bridging ligands (fluorene-2,7-dicarboxylic acid and fluorenone-2,7-dicarboxylate ac-id), in combination with the metal ions. Besides, we choose three pyridyl-containing ligands as auxiliary ligand to build coordination networks. Nine new MOFs with two/three dimensional structures, have been synthesized, and researched some charac-ters of the complexes, such as thermostability and magnetic.This paper can be summa-rized as the following three parts:1. The synthesis of carboxylic ligands:Fluorine as the original compound, after a series of organic chemical reactions we obtained the the target ligands:fluo-rene-2,7-dicarboxylic acid (H2FDC) and fluorenone-2,7-dicarboxylate ac-id(H2FODC). Both are characterized by the IR and NMR spectra.2. Mn(Ⅱ) coordination polymers with H2FODC:In this section, we used H2FDC as organic ligands in combination with Mn(Ⅱ) ions. Amazingly, during the syn-thesis of compound1, the ligand undergoes in situ oxidation to generate a Mn(Ⅱ) coordination polymer with the ligand FODC2-and it was demonstrated that the transformation occurs with dioxygen as reactant and Mn(Ⅱ) as catalyst.3. Zn(Ⅱ) compounds with H2FDC/H2FODC and bipyridyl auxiliary Iigands: Here, we choosed three pyridyl-containing ligands as auxiliary ligand, with H2FDC/H2FODC, synthesized six Zn(Ⅱ) coordination polymers under the condi-tions of solvothermal.