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Issue 8, 2005
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Crystal structure and magnetic properties of a pseudo-cubic close-packed array of oxalate linked {FeII63-OH)6}6+ clusters

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Abstract

The ionic hexanuclear cluster aggregate [FeII63-OH)6]6+ has been synthesised using hydrothermal conditions starting from ferrous oxalate in the presence of barium and bromide or iodide ions. A single crystal X-ray structure on the compond Ba4[FeII63-OH)6(C2O4)6]Br2·6H2O shows that the [FeII63-OH)6]6+ units are held together by bridging oxalates in a pseudo-cubic close-packed array. The barium ions in conjunction with oxalate groups provide a barrel-shaped cage between the FeII6 aggregates containing the bromide counterions and lattice waters and corresponding to an ‘octahedral hole’ in the pseudo-cubic close-packed structure. A magnetic susceptibility study shows that the FeII centres are antiferromagnetically coupled. Below 10 K the system displays a long range antiferromagnetic ordering mediated by the oxalate bridges and a molecular-based description of the magnetism is no longer valid.

Graphical abstract: Crystal structure and magnetic properties of a pseudo-cubic close-packed array of oxalate linked {FeII6(μ3-OH)6}6+ clusters

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Supplementary files

Article information


Submitted
08 Dec 2004
Accepted
07 Mar 2005
First published
18 Mar 2005

Dalton Trans., 2005, 1381-1386
Article type
Paper

Crystal structure and magnetic properties of a pseudo-cubic close-packed array of oxalate linked {FeII63-OH)6}6+ clusters

B. Fei, R. Clérac, C. E. Anson and A. K. Powell, Dalton Trans., 2005, 1381
DOI: 10.1039/B418444K

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