- Two new barium-copper-ethylene glycol complexes: Synthesis and structure of BaCu(C2H6O2)n(C2H 2O2)2 (n = 3, 6)
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Two crystalline barium-copper-ethylene glycol complexes have been isolated and structurally characterized by single-crystal X-ray diffraction. The solution-phase complex has also been investigated as a molecular precursor for use in sol-gel synthesis of high-temperature superconductors. The first crystalline form has the formula BaCu(C2H6O2)6(C2H 4O2)2 (1) and has been isolated directly from ethylene glycol solutions of the barium-copper salt. Crystallographic data for 1 are as follows: monoclinic space group Cc (No. 9), a = 12.103 (6) ?, b = 13.527 (3) ?, c = 17.091 (8) ?, β = 93.17 (2)°, V = 2793.8 ?3, Z = 4, R = 0.030. In this molecule, copper is coordinated to the four oxygens of two ethylene glycolate ligands in a nearly square planar geometry. Barium is coordinated by three bidentate ethylene glycol molecules and three monodentate ethylene glycol molecules; the 9-fold coordination resembles a trigonal prism with each rectangular face capped. Copper and barium moieties do not share any ethylene glycol or glycolate oxygens; they are bound by hydrogen bonding to form linear chains. The second crystal type has formula BaCu(C2H6O2)3(C2H 4O2)2 (2). It was prepared via crystallization of the mixed-metal alkoxide from an ethylene glycol/methyl ethyl ketone solution. Crystallographic data for 2 are as follows: monoclinic space group P21/n (No. 14), a = 12.127 (4) ?, b = 11.913 (1) ?, c = 12.540 (4) ?, β = 102.47 (1)°, V = 1768.9 ?3, Z = 4, R = 0.025. As for 1, the copper is coordinated to four oxygen atoms of two ethylene glycolate ligands in a nearly square planar arrangement. Barium is 8-coordinate in a distorted cubic geometry. It is coordinated to three bidentate ethylene glycol molecules and shares two of the oxygen atoms bound to the copper (one from each coordinated ethylene glycol) to form a discrete molecular barium-copper complex.
- Love, Craig P.,Torardi, Charlie C.,Page, Catherine J.
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- Copper(II) oligomeric derivatives for deposition of copper thin films
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Homobi-, -tri- and -tetranuclear copper(II) oligomeric complexes, [Cu(dmap)(OAc)(H2O)]2-H2O (1), [Cu 3(dmae)3(acac)2- Cl] (2) and [Cu(dmae)(TFA)]4 (3), have been prepared by reac
- Shahid, Muhammad,Tahir, Asif Ali,Hamid, Mazhar,Mazhar, Muhammad,Zeller, Matthias,Molloy, Kieran C.,Hunter, Allen D.
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- Novel Synthesis of Anhydrous and Hydroxylated CuF2 Nanoparticles and Their Potential for Lithium Ion Batteries
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Anhydrous nanoscopic CuF2 is synthesized from alkoxides Cu(OR)2 (R=Me, tBu) by their reaction either in pure liquid HF at ?70 °C, or under solvothermal conditions at 150 °C using excess HF and THF as solvent. Depending on the synthes
- Krahl, Thoralf,Marroquin Winkelmann, Friederike,Martin, Andréa,Pinna, Nicola,Kemnitz, Erhard
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- Copper(II) methoxide: Direct solventothermal synthesis and X-ray crystal structure
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Copper methoxide has been prepared under fairly mild solventothermal conditions by direct reaction of copper(II) acetate monohydrate and methanol. The product has been structurally characterized for the first time by single crystal X-ray diffraction and found to possess a novel infinite one-dimensional chain structure in which copper atoms in distorted square planar coordination environments are linked by bridging methoxide ligands. The conversion of copper acetate to copper methoxide is essentially quantitative. The major byproduct of the synthesis is methyl acetate.
- Nelson, Kendric J.,Guzei, Ilia A.,Lund, Gregory S.,McGaff, Robert W.
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p. 2017 - 2020
(2008/10/08)
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- Synthesis and characterization of volatile monomeric copper(II) fluoroalkoxides
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The reaction of [Cu(OMe)2]n with a fluorinated alcohol in the presence of an amine has afforded a series of new copper(II) fluoroalkoxides: Cu(hfip)2(tmed) (2), Cu(hfip)2(teed) (3), Cu(hfip)2(bipy) (4), Cu(hfip)2(py)2 (5), Cu(hftb)2(tmed) (6), Cu(hftb)2(bipy) (7), and Cu(hftb)2(py)2 (8), where hfip = hexafluoroisopropoxo, hftb = hexafluoro-tert-butoxo, tmed = N,N,N′,N′-tetramethylethylenediamine, teed = N,N,N′,N′-tetraethylethylenediamine, bipy = bipyridine, and py = pyridine. Compounds 5 and 8 have also been prepared by the reaction of CuBr2 with Na(hfip) or Na(hftb) and pyridine. Crystallographic analyses of 2 and 6 reveal that both compounds are monomeric and assume tetrahedrally-distorted square-planar geometries. The dihedral angles between the CuN2 and CuO2 planes are 16.1° for 2 and 40.6° for 6. The average Cu-O distances are 1.903 (3) A? in 2 and 1.884 (3) A? in 6, and the average Cu-N distances are 2.035 (5) A? in 2 and 2.064 (3) A? in 6. EPR and UV-vis studies indicate that the degree of distortion increases in the order 4 2(tmed) (2), space group P21/c, monoclinic, a = 9.454 (i) A?, b = 15.045 (2) A?, c = 14.197 (6) A?, β = 105.65 (2)°, V = 1944 (1) A?3, Z = 4, RF = 0.040 and RwF = 0.052 for 334 variables and 2060 data; for Cu(hftb)2(tmed) (6), space group I2/a, monoclinic, a = 13.601 (3) A?, b = 9.567 (2) A?, c = 16.562 (5) A?, β = 106.56 (2)°, V = 2066 (2) A?3, Z = 4, RF = 0.043 and RwF = 0.037 for 190 variables and 1427 data.
- Jeffries, Patrick M.,Wilson, Scott R.,Girolami, Gregory S.
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p. 4503 - 4509
(2008/10/08)
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- High purity copper alkoxides
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The invention relates to the preparation of high purity, chloride- and alkali metal-free copper (II) alkoxides by means of the reaction of an alcoholic alkali metal alkoxide solution with copper (II) fluoride; ammoniating the resulting solution to render soluble the resulting copper (II) alkoxide; and filtering the resulting solution to obtain an alkali metal- and chloride-free alcoholic copper (II) alkoxide solution. The resulting solution is useful in the preparation of superconducting compound such as yttrium-barium-copper oxide superconductor.
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- New chloro, alkoxo and allied bimetallic derivatives of copper(II) and aluminium(III)
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Novel chloro bimetallic alkoxides of copper(II) of the type ClCui)4> (1) have been synthesized by the interaction of CuCl2 and Ki)4> in equimolar proportions.The derivative (PriO)Cui)4> (2) has been synthesized by the reaction of CuCl2, KOPri and Ki)4> in 1:1:1 molar ratio.The interaction of chloro bimetallic alkoxides with a number of potassium alkoxides gives mixed derivatives of the type (RO)Cui)4> (3-9).The (PriO)Cui)4> (2) undergoes alcohol interchange reactions, the facile nature of which is governed by the length and branching of the hydrocarbon chains of alcohols e.g.MeOH, EtOH, PrnOH, BunOH, BusOH, ButOH.The reaction with BuiOH gives only the mixed bimetallic alkoxides.The products have been characterised by elemental analyses, molecular weights, I.R, electronic spectral and magnetic susceptibility measurements.
- Chhipa, R. C.,Singh, A.,Mehrotra, R. C.
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p. 396 - 399
(2007/10/02)
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- Interactions between Metal Cations and the Ionophore Lasalocid Part 5.- A Potentiometric, Polarographic and Electron Spin Resonance Study of Copper(II)-Lasalocid Equilibria in Methanol
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The complexation of Cu2+ by lasalocid and the model compound salicylic acid, AH, has been studied in methanol.The stability constants of species ACu+ and A2Cu were obtained from potentiometric measurements using a pH glass electrode and a copper-selective electrode, and by polarographic determinations.The stability of these copper(II) complexes was shown to be higher than that of the analogous complexes of the other transition-metal cations of the first row and very similar for lasalocid and salicylic acid.The e.s.r. spectra suggest that the structures of the species formed with the two ligands differ; the oxygen of the backbone probably participates in complexation with lasalocid.In addition, other complexes possibly involving the methoxide ion, formed in more basic media, were characterised.
- Laubry, Philippe,Mousset, Guy,Martinet, Pierre,Tissier, Madeleine,Tissier, Claude,Juillard, Jean
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p. 3175 - 3186
(2007/10/02)
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