Synthesis, Characterization And Performance Study Of Bis(pyridylcarboxamide) Coordination Compounds Basic Research

With excellent coordination ability and multiple hydrogen bonds sites, pyridinecarboxamide ligands are widely concerned by related researchers. In this thesis, wedesigned and synthesized11novel coordination compounds based on Zn (II) or Cd (II)by the well use of bis-pyridylcarboxamide ligands and carboxylate ligands. The main workis as follows:(1) Compounds1-4were synthesised by N1,N4-di(pyridine-4-yl) naphthalene-1,4-dicarboxamide ligand (L1)、organic carboxylic acid ligands and Zn (II) underhydro(solvo)thermal reaction，and studied their crystal structures, elements analysis,thermal stabilities and luminescence properties. Results showed that compounds1-2areeight-fold and three-fold interpenetration structure respectively. Compound3exhibitstypical hydrogen-bonding topological structure. Compound4is a2D layered structure, andshows macroporous structure through the space arrangement and packing. The thermalstability of compounds2and3are better than the compounds1and4, which may beassociated with the pore structures in compounds1and4. Ligand L1and compounds1-4constructed by it all have excellent luminescent properties, nothing but the emissionwavelength happened to change.(2) Compounds5-8were synthesised by N1,N4-bis(pyridine-3-ylmethyl)naphthalene-1,4-dicarboxamide ligand (L2)、organic carboxylic acid ligands and Zn (II) orCd (II) under hydrothermal reaction，and studied their crystal structures, elements analysis,thermal stabilities and luminescence properties. Results showed that compounds of5-6have interesting topology net structures, especially the compound6that shows a typical0D+2D�'2D self interleaving mode. Because of the disorderly arrange of substituent methylposition in the chiral D-cam ligand, the compounds7and8exhibit achiral structures. Thethermal stability of6is better than the others, may related to self interleaved0D+2D�'2D structure. Ligand L1and compounds5-8constructed by it all have excellentluminescent properties, also with the emission wavelength happened to change.(3) Compounds5-8were mainly synthesised by N1,N4-di(pyridin-3-yl)terephthalamide ligand (L3), N1,N4-di(pyridin-3-yl)naphthalene-1,4-dicarboxamideligand (L4), N4,N4’-di(pyridin-3-yl)-[1,1’-biphenyl]-4,4’-dicarboxamide ligand and Zn (II)or Cd (II) under hydrothermal reaction. Notably, three new amide-type ligands (HL6-HL8)that hard to synthesize by conventional organic synthesis, are formed in situ. The structurecharacteristics, thermal stability, fluorescent properties of compounds9-11werecharacterized and evaluated. The structure analysis indicated that compounds9-11mainlyconstructed by these three new carboxylic acid amide-type ligands (HL6-HL8) formed insitu. For9, three distinct organic ligands organize metal centers to give rise to two different 1D chains and finally supramolecular2D net, whereas in11the binding between metalcenters and three distinct organic ligands gives birth to a3D dia or α-Po net. As for10, thephenomenon of spontaneous resolution to produce chiral compounds from achiral source isobserved and the overall structure feature of it is a3D CdSO4-type topology allowingtwo-fold interpenetration. Moreover, the state solid of polymers9-11have no luminescenceproperties. The reason for this result is unclear and needs further research.