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Acta Crystallogr C. 2013 Apr;69(Pt 4):330-3. doi: 10.1107/S0108270113005969. Epub 2013 Mar 14.

Fe2(SO4)3·H2SO4·28H2O, a low-temperature water-rich iron(III) sulfate.

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  • 1Institute of Inorganic Chemistry, TU Bergakademie Freiberg, Leipziger Strasse 29, D-09596 Freiberg, Germany.


The title compound, diiron(III) trisulfate-sulfuric acid-water (1/1/28), has been prepared at temperatures between 235 and 239 K from acid solutions of Fe2(SO4)3. Studies of the compound at 100 and 200 K are reported. The analysis reveals the structural features of an alum, (H5O2)Fe(SO4)2·12H2O. The Fe(H2O)6 unit is located on a centre of inversion at (½, 0, ½), while the H5O2(+) cation is located about an inversion centre at (½, ½, ½). The compound thus represents the first oxonium alum, although the unit cell is orthorhombic.

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