Syntheses and structural study of trinuclear iron acetates [Fe3O(CH3COO)6(H2O)3]Cl· 6H2O and [Fe3O(CH3COO)6(H2O)3] [FeCl4]· 2CH3COOH |
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| Authors: | S G Shova I G Cadelnic M Gdaniec Yu A Simonov T C Jovmir V M Meriacre G Filoti C I Turta |
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| Institution: | (1) Institute of Applied Physics, Academy of Sciences, Kishinev, Moldova Republic;(2) Institute of Chemistry, Academy of Sciences, Kishinev, Moldova Republic;(3) A. Mickiewicz University, Poznan, Poland;(4) National Institute of Material Physics, Bucharest, Rumania |
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| Abstract: | The structure of two trinuclear iron acetates Fe3O(CH3COO)6(H2O)3]Cl· 6H2O (I) and Fe3O(CH3COO)6(H2O)3]FeCl4] · 2CH3COOH (II) was determined by X-ray diffraction analysis. Crystals I and II are ionic and belong to the orthorhombic system with parameters a = 13.704(3), b = 23.332(5), c = 9.167(2) Å, R = 0.0355, space goup P21212 for I and a = 10.145(4), b = 15.323(6), c = 22.999(8) Å, R = 0.0752, space group Pbc21 for II. The complex cation Fe3O(CH3COO)6(H2O)3]+ has a μ3-O-bridged structure typical for trinuclear iron (III) compounds. As shown by Mössbauer spectroscopy, the iron(III) ions are in the high-spin state. In trinuclear cations, antiferromagnetic exchange interaction takes place between the Fe(III) ions with the exchange parameter J = -26.69 cm?1 for II (Heisenberg-Dirac-Van Vleck model for D3h, symmetry). |
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