Author's personal copy Decomposition of allantoin in the presence of Cu(II) ions resulting in the formation of a coordination polymer containing oxalate species (original) (raw)
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Inorganic Chemistry Communications, 2009
A novel Cu(II) coordination polymer, [Cu(ox)(DMSO) 2 ] n (1) (ox-oxalate dianion, DMSO-dimethyl sulphoxide) has been prepared in the reaction of copper nitrate dihydrate and allantoin (5-ureidohydantoin) in DMSO/water solution. Compound (1) crystallizes in the monoclinic, space group P121/c1 with a = 5.1785 , b = 13.6311(18), c = 8.5386(12) Å, b = 107.524(12)°, V = 574,76(14) Å 3 , Z = 4, D cal = 1779 mg/m 3 , R 1 = 0.0449. The metal ion coordinates through four oxygen atoms belonging to two bidentate bridging oxalate ligands, and two oxygen atoms from two DMSO ligands forming an elongated octahedron. The crystal structure was confirmed by FT-IR and Uv-vis spectroscopic data.
217 A Novel Copper(II)–Hydrogen Oxalate Coordination Polymer
A novel Cu(II) coordination polymer of general empirical formula {[Cu(l-HC 2 O 4 ) 2 (H 2 O) 2 ][Cu(HC 2 O 4 ) 2 ]Á 6H 2 O} n has been synthesized and characterized by single-crystal X-ray diffraction technique. The complex (1) crystallizes in the triclinic form with P-1 space group. It is quite surprising that single crystal X-ray analysis of 1 illustrates the presence of hydrogen oxalate ligand in the coordination environment of Cu(II) ion. Because oxalate is not present in the starting reaction mixture, it may be derived from the reduction of squarate ligand. In 1, Cu(II) ions exhibit two different coordination environments, forming a distorted octahedral geometry. The Cu1 is coordinated with six oxygen atoms from two bidentate HC 2 O 4 and two aqua ligands, while Cu2 is coordinated with six oxygen atoms from four HC 2 O 4 ligands. The HC 2 O 4 ligand acts in two different coordination modes, as a bidentate and an unprecedented tridentate bridging coordination mode.
A Novel Copper(II)–Hydrogen Oxalate Coordination Polymer Showing a New Coordination Mode
Journal of Inorganic and Organometallic Polymers and Materials, 2009
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Copper(I) oxalate complexes: Synthesis, structures and surprises
Polyhedron, 2016
A series of dinuclear copper(I) oxalate complexes was synthesized by the direct acid-base reaction of Cu2O with oxalic acid in ethanol with a ligand, or in neat ligand. The complexes incorporated a variety of ligands L (L = triphenylphosphine, 1,2bis(diphenylphosphino)ethane, triphenylphosphite, diisopropyl sulfide, cyclooctadiene and cyclohexylisocyanide) and had the general formula LnCu(µ2-C2O4)CuLn (n = 1 or 2). The Cu I /Cu II mixed-valence trinuclear compound (iPr2S)2Cu I (C2O4)Cu II (C2O4)Cu I (iPr2S)2 was formed concomitantly with the target dinuclear Cu2C2O4(iPr2S)4 complex, shedding light on the mechanism of disproportionation of this family of complexes. With norbornadiene (nbd) as a ligand, however, a coordination polymer Cu2C2O4(nbd) was formed. Also, the same reaction with L = 2,9-dimethyl-1,10-phenanthroline or pyridine resulted in the known tetrahedral complex ions [CuLm] + (m = 2 or 4). Lastly, the ligand di-2-(1-di-(2-picolyl)amino)propyl 3 disulfide produced not the expected Cu(I) oxalate complex, but a Cu(II) picolylamine oxalate coordination polymer. All products were structurally characterized by single-crystal X-ray diffraction if soluble, and by powder X-ray diffraction methods if not.
A novel coordination polymer[{Cu(en) 2 }(V 10 O 28 )] n Á 2n[Cu(en) 2 (H 2 O)] Á 2n(H 3 BO 3 ) Á 2n(H 2 O) was obtained by hydrothermal reaction. The compound crystallizes in the monoclinic crystal system, in the C2/c space group, with a ¼ 26.490 (3) Å; b ¼ 11.6558 (11) Å; c ¼ 19.8426 (19) Å; b ¼ 124.011 (1)8; V ¼ 5078.6(8) Å 3 . The solid structure is formed by polymeric chains, [Cu(en) 2 (H 2 O)] 2þ cations, and boric acid and water solvate molecules, stabilized through a multiple hydrogen bond network.
A new [Cu(ox)(Im)2] complex resulting from the oxidation of chelidonate to oxalate
Journal of Molecular Structure, 2010
We report herein the solid state structure of a new complex [Cu(ox)(Im)2] (II) which adopts a mononuclear 0D form in contrast to the polymeric 1D form adopted by the previously described [Cu(ox)(Im)2]∞1 (I). Both compounds were obtained from an oxidative transformation of chelidonate to oxalate in the presence of Cu(II) and imidazole. The packing and weak interactions of II are
European Journal of Inorganic Chemistry, 1999
The new heterometallic sodium(I)-copper(II) compound coordinated sodium cations, and water molecules. In the crystal, the dinuclear copper entities are joined through Na 4 Cu 2 (2) · 10.5 H 2 O (3), where H 8 stands for N,NЈ,NЈЈ,NЈЈЈ-methanetetrayltetrakismethylenetetrakis(oxa-discrete aggregates of eight sodium atoms linked by oxamato and water bridges, leading to a three-dimensional poly-mic acid), has been synthesized and its crystal structure determined by single-crystal X-ray diffraction. The structure meric network. of 3 consists of cationic [Cu 2 (η 4 :η 4 -2)] 4dinuclear units,
Bulletin of the Chemical Society of Ethiopia, 2010
Two new copper complexes [(bipy)(pydc)Cu(µ-OCO-pydc)Cu(bipy)(H2O)].3.5H2O (1) and {[(µ2-C2O4)(2,2'-bipy)Cu].2H2O}n (2) (pydcH2 = pyridine-2,6-dicarboxylilic acid, bipy = 2,2'-bipyridine) have been hydrothermally synthesized. Both complexes were characterized by IR spectroscopy, elemental analysis and single crystal X-ray diffraction studies. Complex 1 consists of two independent neutral molecules. In every moiety, metal ion center is in a distorted octahedral geometry. Coordination polymer (2) has been prepared from the reaction of bis-(cyclohexanone)-oxal-dihydrazone,2,2'-bipyridine and Cu(NO3)2 in basic solution and under hydrothermal condition. The results showed that the bis-(cyclohexanone)-oxal-dihydrazone was converted to oxalate ion under heating and basic pH. Each metal ion center in 2 is in a distorted octahedral geometry and is coordinated by four oxygen atoms of two bridged oxalate ions and two nitrogen atoms of 2,2'-bipyridine molecules. In the crystal structure of 2, some H-bonds and π-π interaction cause formation of a 3D network.