Synthesis, crystal and molecular structures of the octanuclear cationic mixed-valence cobalt acetate complex

Fischer, A. I.; Ruzanov, D. O.; Gorlov, Mikhail; Shchukarev, Andrey; Belyaev, A. N.; Simanova, S. A.

doi:10.1134/s1070328407110012

Cited by 5 publications

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References 11 publications

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“…In contrast, the Mn(II) ion in complex 3 is coordinated by six oxygen atoms from two biuret molecules and two acetate anions. Several complexes in which the acetate anions are coordinated had been reported [7][8][9]. In the four complexes, six coordinated atoms form an octahedral geometry, and four oxygen atoms presenting quadrilateral from two biuret are in the same plane with the metal ions.…”

Section: Synthesis Of [Nimentioning

confidence: 99%

Synthesis, Optical Characterization, and Thermal Decomposition of Complexes Based on Biuret Ligand

Wang

Chen

2016

International Journal of Optics

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Four complexes were synthesized in methanol solution using nickel acetate or nickel chloride, manganese acetate, manganese chloride, and biuret as raw materials. The complexes were characterized by elemental analyses, UV, FTIR, Raman spectra, Xray powder diffraction, and thermogravimetric analysis. The compositions of the complexes were, and [Mn(bi) 2 Cl 2 ] (4) (bi = NH 2 CONHCONH 2 ), respectively. In the complexes, every metal ion was coordinated by oxygen atoms or chlorine ions and even both. The nickel and manganese ions were all hexacoordinated. The thermal decomposition processes of the complexes under air included the loss of water molecule, the pyrolysis of ligands, and the decomposition of inorganic salts, and the final residues were nickel oxide and manganese oxide, respectively.

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Section: Synthesis Of [Nimentioning

confidence: 99%

Synthesis, Optical Characterization, and Thermal Decomposition of Complexes Based on Biuret Ligand

Wang

Chen

2016

International Journal of Optics

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“…However, only poor information is available about the octanuclear mixed-valence cobalt complexes with a metal containing framework of the étagère-shapedtype [4][5][6]. We obtained and characterized with the X-ray diffraction two new cobalt carboxylate complexes with such framework: [Co 4 II Co 4 III (μ 4 -O) 4 · (μ 3 -OMe) 4 (μ-O 2 CR) 6 (O 2 CR) 2 (H 2 O) 6 ]·4H 2 O, where R = Et (I) and Pr (II).…”

mentioning

confidence: 99%

“…However, only poor information is available about the octanuclear mixed-valence cobalt complexes with a metal containing framework of the étagère-shapedtype [4][5][6]. We obtained and characterized with the X-ray diffraction two new cobalt carboxylate complexes with such framework: [Co 4 II Co 4 III (μ 4 -O) 4 · (μ 3 -OMe) 4 Complexes I and II have the same metal-containing framework of the étagère-shaped type: the framework includes three cubane fragments {Co 4 O 4 } with two common faces.…”

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confidence: 99%

Synthesis of octanuclear mixed-valence cobalt(II, III) propionate and butyrate with the Étagère-like core

2012

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The mixed-valence cobalt carboxylates attract attention due to the role that they play in the catalytic processes of industrial liquid-phase oxidation of hydrocarbons [1][2][3]. However, only poor information is available about the octanuclear mixed-valence cobalt complexes with a metal containing framework of the étagère-shapedtype [4][5][6]. We obtained and characterized with the X-ray diffraction two new cobalt carboxylate complexes with such framework: [Co 4 II Co 4 III (μ 4 -O) 4 · (μ 3 -OMe) 4 (μ-O 2 CR) 6 (O 2 CR) 2 (H 2 O) 6 ]·4H 2 O, where R = Et (I) and Pr (II).Compounds I and II crystallize in the monoclinic system. I, space group Cc, a = 17.373 (4), b = 15.987(3), c = 20.544(4) Å, β = 97.24 (3)º, Z = 4, R = 2.90% [I > 2σ(I)]. II, space group C2/c, a = 17.891(4), b = 16.283(3), c 20.862(4) Å, β = 94.599(4)º, Z = 4, R = 4.30% [I > 2σ(I)].Complexes I and II have the same metal-containing framework of the étagère-shaped type: the framework includes three cubane fragments {Co 4 O 4 } with two common faces. Around the framework there are six bidentate bridging carboxylate ligands forming a double helix motif. In the crystals of complexes I and II the enantiomeric components (right and left spirals) are in equal amount, that is, these compounds are racemates. The complexes I and II are valencetrapped: the Co III atoms are located in the central cubane fragment, while the Co II atoms are on the molecule periphery [7]. [Co 8 O 4 (MeO) 4 (EtCOO) 8 (H 2 O) 6 ]·4H 2 O (I). A weighed portion of cobalt(II) propionate dihydrate [8](2.89 g, 12.0 mmol) was dissolved in 45 ml of methanol. After cooling the solution to -10ºC to it was added dropwise with stirring 0.44 ml of 40% aqueous hydrogen peroxide (6.0 mmol). The solution color changed from purple to dark green and there was a slight evolution of oxygen. At the stepwise evaporation of the solvent, on the walls of the beaker a light-green precipitate began to form, and then formed dark green crystalline precipitate of compound I. Before complete evaporation of the solvent, the solution color changed initially to brown, then to crimson, indicating the predominance of the original cobalt(II) propionate. After evaporation of the solvent, to the residue was added methanol in small portion, each time decanting the formed brown solution until the solution remained

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Crystal and molecular structures of mixed-valence octanuclear cobalt(ii,iii) propionate and butyrate with an etagere-like core

et al. 2012

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Synthesis, crystal and molecular structures of the octanuclear cationic mixed-valence cobalt acetate complex

Cited by 5 publications

References 11 publications

Synthesis, Optical Characterization, and Thermal Decomposition of Complexes Based on Biuret Ligand

Synthesis, Optical Characterization, and Thermal Decomposition of Complexes Based on Biuret Ligand

Synthesis of octanuclear mixed-valence cobalt(II, III) propionate and butyrate with the Étagère-like core

Crystal and molecular structures of mixed-valence octanuclear cobalt(ii,iii) propionate and butyrate with an etagere-like core

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