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Synthesis, characterization and crystal structure analysis of a novel oxo-centered mixed-metal complex containing unsaturated bridging carboxylates

100%
Yazdanbakhsh M., Lotfian N., Tavakkoli H., Boese R.
Open Chemistry
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2011
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vol. 9
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issue 4
585-589
EN
A novel oxo-centered trinuclear mixed-metal carboxylate complex with unsaturated bridging ligands [Fe2Cr(µ3-O)(C3H3O2)6(H2O)3]·NO3·4H2O has been synthesized and characterized by means of Elemental analyses, Infrared spectroscopy and Crystal structure analysis. The compound crystallizes isotypically in the monoclinic space group type P21/c. In the compound, each M(III) cation is coordinated by six O atoms from four unsaturated carboxylate groups as bridging ligands, one water molecule as the terminal ligand, and a µ3-oxygen atom in the center of an equilateral triangle. The infrared spectra show resolved bands arising from νasym(COO) and νsym(COO) vibration of bridging carboxylate ligands along with those of νasym(M2M′O) vibration in the complex. The difference between symmetrical and asymmetrical (COO) ligands indicate that the acrylate bridge is present in the structure of complex. [...]
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Role of MoVTeNb oxide catalyst constituent phases in propane oxidation to acrylic acid.

86%
Ishchenko E. V., Popova G. Y., Kardash T. Y., Ishchenko A. V., Plyasova L. M., Andrushkevich T. V.
Catalysis for Sustainable Energy
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2012
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vol. 1
75-81
EN
The catalytic activity of MoVTeNbO catalyst and its constituent phases (M1, M2 and Mo5O14-like) in the oxidation of propane, as well as propylene and acrolein, which are intermediates of acrylic acid formation from propane, was studied. In all the reactions, the М1 phase shows higher activity and selectivity, compared to M2 and Mo5O14-like phases; its presence being sufficient for efficient proceeding the propane oxidation to acrylic acid.
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