Construct, Crystal Structures And Properties Of Coordination Polymers Based On Pyridine Carboxylic Acid Ligands

Metal-organic Coordination Polymers based on carboxylate ligands have well-defined and infinite network structures and potential applications in magnetism, luminescence, catalysis, gas storage and separation. In this thesis, we choose3,5-bis(pyridin-4-ylmethoxy) benzoic acid (HL) as main ligand, and dicarboxylic acid as the ancillary ligands, eleven coordination polymers with novel structures have been obtained. These coordination polymers were characterized by elementary analysis, IR, thermo-gravimetric analysis and single crystal X-ray diffraction. For the more, luminescence properties were studied for some coordination polymers. The main results are as follows:1. Based on3,5-bis(pyridin-4-ylmethoxy)benzoic acid (HL), four complexes1-4[Co2L2(bdtc)(H2O)]n (1),[Ni2L2(tdc)(H2O)2]n·2nH2O (2),[Zn2L2(bdtc)]n·1.5nH2O (3),[Cd2L(adbc)(Ac)(H2O)3]n·nH2O (4) have been solvothermally synthesized. Complexe1can be considered as a (3,8)-connected3D structure; Complexes2and3show (3,4)-connected3D structures; Complexe4shows a (3,4)-connected2D structure.2. Based on3,5-bis(pyridin-4-ylmethoxy)benzoic acid (HL), seven new complexes with interpenetrating networks:[Co2L2(tpa)]n (5),[Co2L2(tdc)]n (6),[Zn2L2(tdc)]n (7),[Co2L2(adbc)]n·nH2O (8),[Zn4L4(Hhdc)2]n·nH2O (9),[Zn2L2(Hhdc)]n·nH2O (10),[Cd2L2(bdtc)(H2O)]n·0.5nH2O (11) have been synthesized by solvothermal reaction. Topology analysis indicates that complexes5-7are isostructural, and complexes5-10exhibit4-fold interpenetrating (3,4)-connected3D networks; Complexe11displays a3-fold interpenetrating (3,4)-connected2D network. Complexes7,10and11were characterized by thermo-gravimetric analysis and luminescence properties, complexes7,10and11can be decomposed at a specific temperature, and show certain fluorescence properties.