Ren-Zhang Wang

A metal-oxo cluster-supported transition metal complex: synthesis, structure and properties of [Cu(phen)2]2[{Cu(phen)}2Mo8O26]·H2O

Abstract [Cu(phen)2]2[{Cu(phen)}2Mo8O26]·H2O has been synthesized from MoO3, H2MoO4, Cu(Ac)2·H2O and 1,10-phenanthroline in aqueous solution using the hydrothermal method and characterized by single-crystal X-ray structure analysis. The title compound consists of a centrometric β-octamolybdate-supported complex anion [{Cu(phen)}2Mo8O26]2−, two bis-phenanthroline Cu(I) cations, and one water molecule of crystallization.

SYNTHESIS AND STRUCTURE OF A NOVEL MONONUCLEAR TUNGSTEN (VI) CITRATO COMPLEX, (NH4)3[Li(H2O)3WO3(C6 H4O7)]

Abstract The first mononuclear tungsten-citrato complex, (NH4)3[Li (H2O)3WO3(C6H4O7)] (1), has been prepared by the reaction of ammonium tetrathio tungstate and lithium citrate in CH3OH-H2O solution at pH 8.2. There are two crystallographically independent anions in the asymmetric crystallographic unit. The crystal structure of the title compound (triclinic, space group P1, a = 6.901(1), b = 15.136(3), c = 16.107(3) Å, α = 75.85(3), β = 89.89(3), γ = 89.97(3), V = 1631.4(6) Å3, R = 0.068, R W = 0.1674 for 3878 reflections with I > 2σ(I)), reveals that in the compound a tungsten atom is coordinated to a fully deprotonated citrate as a tridentate ligand and three terminal oxygen atoms to form a distorted coordination octahedron.

Metal–oxo cluster-supported transition metal complexes: hydrothermal synthesis and characterization of [{M(phen)2}2(Mo8O26)] (M = Ni or Co)

Two new metal–oxo supported transition metal complexes, [{M(phen)2}2(Mo8O26) (M = Ni or Co; phen = 1,10-phenanthroline) are synthesized by a hydrothermal method and characterized by X-ray crystallography, showing that the octamolybdate possesses a novel unprecedented structure and that [M(phen)2]2+ units are covalently bonded to the [Mo8O26]4– cluster.

Hydrothermal synthesis and characterization of [Ni(phen)3]2[Mo8O26]·2H2O

Abstract The reaction of MoO3, H2MoO4 and Ni(Ac)2·6H2O with 1,10-phenanthroline by a hydrothermal method furnishes the discrete cluster [Ni(phen)3]2[Mo8O26]·2H2O (1). The structure of 1 is triclinic, space group P1, a=11.4965(10), b=11.6829(13), c=15.1518(15) A, α=83.032(8), β=71.557(7), γ=78.319(7)°, R=0.0433 for 7397 observed [I>2σ(I)] reflections. The crystallographically determined solid state structure of 1 shows that the cluster consists of two complex cations, one cluster anion [Mo8O26]4− and two water molecules of crystallization. Each nickel ion is coordinated by six nitrogen atoms from three phenanthroline ligands, forming a distorted octahedron, and the anion has a β-configuration formed by eight edge-sharing MoO6 octahedra. Compound 1 was characterized by means of elemental analysis, IR spectra and TGA analysis.

Preparation and Characterization of a Novel Complex of Molybdenum(V) with Homocitrate, K5(NH4)[MO2O2S2(C7H6O7)2]·4H2O

Abstract A new binuclear molybdenum-sulfur complex with homocitrate, K5(NH4)[MO2O2S2(C7H6O7)2]·4H2O, was synthesized and characterized by elemental analyses, spectroscopy (infrared, UV-Visible, 1H and 13C NMR, XPS and EPR), and TG-DTA. According to the proposed binuclear structure of the compound, each octahedral molybdenum atom is coordinated to hydroxyl, α-carboxylate and β-carboxylate groups of a homocitrate molecule, two bridging-sulfur atoms and a terminal oxygen atom.

The Synthesis and Structure of A. New Oxomolybdenum Complex with Oxalate as Ligand

Abstract An oxomolybdenum complex with oxalate as ligand has been synthesized by the reaction of (NH4)2MoS4 and K2C2O4H2O in the presence of KOH. The crystal structure of the complex K2[MoO3(C2O4)]H, O (1) has been determined by X-ray diffraction. The crystals belong to the monocinic space group P21 /a, with a = 7.544 (1) A, b = 12.767 (3) A, c = 8.710 (4)A, P. = 95.10 (2)°, Z. = 4, V. = 835.6 (5) A3, F (OOO) = 632, R. = 0.025 and Rw = 0.042. The structure analysis reveals that the complex is a new infinite-chain compound, in which each molybdenum atom is coordinated to bridging oxo, terminal oxo and oxalato ligand, forming a distorted octahedron.

Mobybdenum(VI)-oxygen complex containing citrage ligand: synthesis and characterization of K6[Mo2O5(cit)2]·5H2O

Abstract The complex, K6[Mo2O5(cit)2]·5H2O was obtained by crystallization from reaction of [Et4N]3[Mo2FeS8O2 and potassium citrate (K3cit) in methanol and water under an atmosphere of pure nitrogen at ambient temperature. The complex is triclinic, space group P1, a = 11.843(8) A, b = 13.717(8) A, c = 10.287(5) A, α = 108.11(4) °, β = 99.42(5) (1) °, γ = 66.52(4) °, R = 0.034 for 4510 observed (I > 3 σ (I)) reflections. Single crystal structure analysis reveals that citrate ligand coordinated to molybdenum atom through two carboxylato oxygens and one deprotonated hydroxyl oxygen together with one bridging oxygen atom and two terminal oxygen atoms completes distorted coordination octahedron around each molybdenum atom. IR spectra are in agreement with the structure.

Synthesis and magnetism of binuclear cobalt(II) complexes with the tetraacetylethene dianion as a bridging ligand

Three novel binuclear CoIIcomplexes, [Co2(TAE)-(phen)4](ClO4)2·3H2O(1),[Co2(TAE)(Nphen)4](ClO4)2 ·4H2O(2) and [CO2(TAE)(bipy)4](ClO4)2·H2O(3) (TAE=tetraacetylethene dianion, phen=1,10–phenanthroline, Nphen=5–nitro·1,10–phenanthroline, bipy =2,2′-bipyridy1), have been synthesized and characterized by elemental analysis, i.r., molar conductance and electronic reflection spectra. The complexes are proposed to contain tetraacetylethene dianion bridged structures and two CoII ions. The variable-temperature magnetic susceptibility of complex (1) was measured in the 4–300 K range. The magnetic coupling parameter is consistent with antiferromagnetic exchange between the two CoII centres and the data fit a binuclear magnetic exchange model based on the Hamiltonian operator (Ĥ = −2 JŜ1Ŝ2, S1=S2=3/2), giving the antiferromagnetic coupling parameter of 2J=−1.55cm−1.