Synthesis, Structures And Properties Study Of Novel Coordination Complexes Based On Flexible Long-chain Polycarboxylate

The design and assembly of metal-organic frameworks (MOFs) have attracted great attention during the past two decades, not only because of their enormous variety of molecular architectures and topologies, but also their interesting properties and broad potential applications as new functional materials. The aim of this thesis is to synthesize some metal-organic coordination polymers which may exhibit magnetic, on the basis of flexible long-chain polycarboxylate, diverse N-heterocyclic derivatives and transition metal salts by Hydrothermal/ solvothermal techniques. Studing the synthetic conditions and rules of these compounds, analysizing the topological and entangled types of these compounds, exploring the rules of different diverse N-heterocyclic derivatives and different transition metal ion with the same carboxylic acid ligand to generate complexes. We explored the entanglement networks and microporous about 5,5’-(1,3-phenylenebis(methyleneoxy))diisophthalic acid. We synthesized fifteen new metal-organic coordination polymers. Their structures were characterized by ICP analyses, IR spectra, single-crystal X-ray diffraction analyses, X-ray powder diffraction (XRPD) and elemental analyses. The thermal stabilities (TG) and magnetic properties of some compounds have also been studied.1. We have chosen flexible long-chain polycarboxylate and transition metal salts in the presence of different N-heterocyclic derivatives to synthesizing seven compounds with different types of entanglement by hydrothermally Hydrothermal and/or solvothermal techniques. They are,Compound 1 is 1D molecular chians with one-end coordinated bpp(l,3-bis(4-pyridyl)propane) as side arms on one side, which thread through the squares of adjacent polymeric units in a mutual relationship, resulting in 1Dâ†'2D polythreading with finite components based on flexibly long ligand. Compounds 2-4 exhibited unusual 2Dâ†'2D polythreaded frameworks, in which different N-donor ligands acted as lateral arms. Compound 5 displays a characteristic 2Dâ†'3Dpolythreaded framework obtaining from 2D layer frameworks with two types of lateral arms. As far as we know, such a 2D layer containing two types of lateral arms is still very rare in those systems of metal-organic complexes. Compounds 6-7 exhibit unusual ODâ†'0D interdigitated frameworks. In addition, the magnetic properties of compounds 1-5 were also studied. Only a few coordination compounds containing H4L ligand have been reported to date. However, coordination compounds containing the H4L and N-donor ligands have never been observed so far. Therefore, much work is still necessary to understand the coordination chemistry of H4L ligand.2. Eight porous metal-organic coordination polymers have been prepared by self-assembly of flexible long-chain polycarboxylate (H4L) and transition metal salts in the presence of assistant N-containing ligands, that are,Compounds 8-10 are a series of 3D porous coordination polymers which possess the same framework. Compounds 11-14 have the similar framework with compounds 8-10, which possess similar interlayer channels but encapsulate water. Compound 15 was prepared by self-assembly of flexible long-chain polycarboxylate (H4L) and transition metal salts which was different from compounds 1-14. Compound 15 is a 2D motifs which possess larger channels. In this section, we had attempted to exchange the nitrogen ligands to regulate the size of the hole.