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The dominant species in aqueous copper(II) solutions containing a high concentration of oxalate (ox) is trans[Cu(ox)(2)(H2O)(2) ](2-), yet the ability of the oxalate anion to bridge metal ions means that very few examples of this isolated anion are seen in solid state structures. The structure of [pipH(2)](2+)[Cu(ox)(2)(H2O)(2)](2-). 2H(2)O (pip = piperazine) (1) comprises discrete ions held in a complex 3-dimensional hydrogen bonded network.
Hydrothermal synthesis under basic conditions has given a new cluster compound, Ni-7(OH)(8)(ox)(3)(pip)(3) (ox = oxalate; pip = piperazine). This hybrid material comprises inorganic Ni-7(OH)(8) clusters, which have a vertex-shared dicubane structure. These units are held together in a 3-dimensional coordination network by organic bridging ligands. Magnetic susceptibility studies suggest a ferromagnetic coupling within the cluster and an antiferromagnetic interaction between neighbouring Ni-7 units. At low temperatures the material appears to undergo a magnetic phase transition to an ordered antiferromagnetic state with T-N = 17 K.
The structures of four new compositionally related compounds are described; [Cu(en)(2)(H2O)(2)][ox] (1), [Cu(en)(3)][ox] (2), [Co(en)(3)](2)[ox](3)(H2O)(3.61) (3), and [Co(en(3))](2)[ox](3)(H2O)(7) (4) [en = 1,2-ethylenediamine, ox oxalate]. These materials all inhabit the broader structural landscape for compounds with a generic M-p(ox)(q)(en)(r)(H2O)(s) composition. Here the competing nature of the ligands; ethylenediamine, oxalate and water, results in complex solution chemistry. In addition the very different structure directing effects of each type of ligand yield a range of crystal architectures. In the present cases ethylenediamine displaces the oxalate dianion, which is non-coordinated in each of these compounds. Compound 3 has disordered water of crystallisation, and is a non-stiochoimetric hydrate, while compound 4 shows a co...
In this article, techniques for separating mixtures of insoluble compounds are discussed with respect to the small quantities found in laboratory preparations, as opposed to industrial quantities. The techniques include separations based on density, surface area and differences in particle size. Also discussed are simple apparatus, readily available in the laboratory or from commercial suppliers, for achieving these techniques
The crystal structures of two copper(II)(dien) coordination compounds with diamagnetic [Fe(II)(CN)(6)](4) or [Co(III)(CN)(6)](3) bridges were determined from single crystal X-ray diffraction and their magnetic properties investigated by SQUID measurements. The first, {[Cu(dien)](2)[Fe(CN)(6)]}(n)center dot 4n H2O (1), where dien is diethylenetriamine, consists of linear Cu(II)-Fe(II)-Cu(II) trimers. The Cu2+ ions are equatorially coordinated by dien and bridged by a hexacyanoferrate anion. A two-dimensional network is formed through longer axial Cu center dot center dot center dot NC-Fe bonds. The second, {{[(Cu(dien))(2)(pz)](2)[Co(CN)(6)]}[Co(CN)(6)]}(n)center dot 6n H2O (2), where pz is pyrazolate, contains butterfly-shaped Cu(II)(2)-Co(III)-Cu(II)(2) pentamers. The Cu2+ ions are again equatorially coordinated by dien and bridged by...
The title compound, [Cu(C2O4)(2)(C6H9N2)(2)], crystallizes in the space group P2(1)/c, with the Cu atom located at a centre of symmetry. It is a neutral coordination complex in which the metal exhibits a tetragonally elongated octahedral trans-CuO4N2 coordination environment. Extensive intermolecular hydrogen bonding between the oxalate anions and the ammonium cations determines the molecular packing in the crystal
We report the synthesis, structure, and magnetism of two coordination polymers with a designed network topology. These isostructural materials are hydrothermally crystallized having a composition of M(en)(ox) (en = ethylenediamine, ox = oxalate, M = Co(II) 1 and Ni(II) 2). The structures show a rare bridging mode of ethylenediamine which links linear [M(ox)](infinity) chains into an oblique two-dimensional network. Both compounds show anti ferromagnetic interactions behaving as one-dimensional magnets. The magnetism of 1 is consistent with an S = 3/2 chain affected by spin-orbit coupling (g = 2.814(2), J/k(B) = - 16.03(3) K, D/k(B) = 86.2(4) K), while 2 is a candidate Haldane antiferromagnet (g = 2.194(2), J/k(B) = -39.3(1), E(g)/k(B) = 16.5 K). We discuss the use of models for S = 3/2 antiferromagnetic chains and present our own polyn...
The six-coordinate copper(II) ions in the title compound, [Cu(C2O4)(CH5N)], experience a Jahn-Teller distortion. The structure is a two-dimensional coordination network, with three crystallographically independent oxalate ions, two of them centrosymmetric, bridging Cu-II ions in three different coordination modes. Each Cu ion is also coordinated by methyl-amine which is involved in both intra- and inter-layer hydrogen bonding.
The title compound, [Co(CO3)(C4H11N)(4)](C5H10NO2).2H(2)O, is a coordination complex with an N4O2 coordination sphere around the central Co-III ion. The small bite angle of the chelating carbonate causes a distortion of the octahedral geometry to an approximately C-2nu local symmetry. Hydrogen-bonding between the carbonate, carbamate and amine groups, and the water of crystallization, results in a complex two-dimensional network.
The dominant species in aqueous copper(II) solutions containing a high concentration of oxalate (ox) is trans[Cu(ox)(2)(H2O)(2) ](2-), yet the ability of the oxalate anion to bridge metal ions means that very few examples of this isolated anion are seen in solid state structures. The structure of [pipH(2)](2+)[Cu(ox)(2)(H2O)(2)](2-). 2H(2)O (pip = piperazine) (1) comprises discrete ions held in a complex 3-dimensional hydrogen bonded network.
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