Coordination polymer

About: Coordination polymer is a research topic. Over the lifetime, 11988 publications have been published within this topic receiving 212219 citations.

Co(II) Coordination Polymers with Co-Ligand Dependent Dinuclear to Tetranuclear Core: Spin-Canting, Weak Ferromagnetic, and Antiferromagnetic Behavior

Abstract: Four new Co(II) containing coordination polymers have been synthesized using an ether bridged tricarboxylic acid ligand, o-cpiaH3 (5-(2-carboxy-phenoxy)-isophthalic acid). This ligand readily reacts with CoCl2·6H2O in the presence of different nitrogen donor ligands such as 1,10-phenanthroline (phen), 4,4′-bipyridyl (bpy), 4,4′-azopyridine (apy), and 1,4-bis(4-pyridinylmethyl)piperazine (bpmp) under hydrothermal conditions to afford three 3D and one 2D coordination polymers, {Co3(o-cpia)2(phen)(H2O)·5H2O}n(1), {Co1.5(o-cpia)(bpy)}n (2),{Co2(o-cpia)(OH)(apy)0.5}n (3), and {Co(o-cpiaH)(bpmp)0.5}n (4). Single crystal X-ray studies show that these coordination polymers contain homometallic clusters varying from dimeric to tetrameric depending upon the co-ligand used. In complexes 1 and 2, Co(II) ions form an angular and linear trimeric unit that extends along all directions to generate an overall 3D structure. In contrast, 3 forms a 3D coordination polymer containing a tetranuclear Co(II) unit. When the dista...

Synthesis, Crystal Structure and Thermal Reactivity of New Copper(I) Halide Pyrimidine-Containing Coordination Polymers

Abstract: Reaction of copper(I) chloride with pyrimidine in acetonitrile leads to the formation of the ligand-rich 1:1 compound poly[CuCl(μ2-pyrimidine-N,N′)] (1). “Zig-zag”-like CuCl chains are found in the crystal structure that are connected by the pyrimidine ligands to form layers. This compound loses half of its ligands upon heating and transforms into the new l2:1 coordination polymer poly[(CuCl)2(μ2-pyrimidine-N,N′)] (2). In this structure, ladder-like CuCl double chains occur which are connected by the pyrimidine ligands to form layers. If copper(I) iodide is used in the synthesis, the new 1:1 coordination polymer poly[CuI(μ2-pyrimidine-N,N′)] (3) forms. In contrast to compound 1, CuI single chains and (CuI)2 dimers are found as the CuX substructure, and these are connected by the ligands to form sheets. On heating this compound a similar behaviour as for compound 1 is observed, and a transformation into the new 2:1 compound poly[(CuI)2(μ2-pyrimidine-N,N′)] (4) occurs. This compound is not isotypic to 2 even though the topology of the coordination network is identical (CuI double chains are connected into layers by the pyrimidine ligands). The thermal behaviour of the known compounds poly[CuBr(μ2-pyrimidine-N,N′)] (5) and poly[(CuBr)2(μ2-pyrimidine-N,N′)] (6) was also investigated. A transformation of the ligand-rich 1:1 compound 5 into the 2:1 compound 6 is also observed in the thermal decomposition reaction. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)

Crystal Chemistry of Uranyl Carboxylate Coordination Networks Obtained in the Presence of Organic Amine Molecules

Abstract: Three uranyl isophthalates (1,3-bdc) and two uranyl pyromellitates (btec) of coordination-polymer type were hydrothermally synthesized (200 °C for 24 h) in the presence of different amine-based molecules [1,3-diaminopropane (dap) or dimethylamine (dma) originating from the in situ decomposition of N,N-dimethylformamide]. (UO2)2(OH)2(H2O)(1,3-bdc)·H2O (1) is composed of inorganic tetranuclear cores, which are linked to each other through the isophthalato ligand to generate infinite neutral ribbons, which are intercalated by free H2O molecules. The compounds (UO2)1.5(H2O)(1,3-bdc)2·0.5H2dap·1.5H2O (2) and UO2(1,3-bdc)1.5·0.5H2dap·2H2O (3) consist of discrete uranyl-centered hexagonal bipyramids connected to each other by a ditopic linker to form a single-layer network for 2 or a double-layer network for 3. The protonated diamine molecules are located between the uranyl–organic sheets and balance the negative charge of the layered sub-networks. The phase (UO2)2O(btec)·2Hdma·H2O (4) presents a 2D structure built up from tetranuclear units, which consist of two central sevenfold coordinated uranium centers and two peripheral eightfold coordinated uranium centers. The connection of the resulting tetramers through the pyromellitate molecules generates an anionic layerlike structure, in which the protonated dimethylammonium species are inserted. The compound UO2(btec)·2Hdma (5) is also a lamellar coordination polymer, which contains isolated eightfold coordinated uranium cations linked through pyromellitate molecules and intercalated by protonated dimethylammonium species. In both phases 4 and 5, the btec linker has non-bonded carboxyl oxygen atoms, which preferentially interact with the protonated amine molecules through a hydrogen-bond network. The different illustrations show the structural diversity of uranyl–organic coordination polymers with organic amine molecules as countercations.