Fe2(SO4)3·H2SO4·28H2O, a low-temperature water-rich iron(III) sulfate
International Union of Crystallography, 2013
Acta Crystallographica Section C
Volume 69, Issue 4, pages 330–333, April 2013
How to Cite
Schmidt, H., Hennings, E., Zürner, P. and Voigt, W. (2013), Fe2(SO4)3·H2SO4·28H2O, a low-temperature water-rich iron(III) sulfate. Acta Crystallographica Section C, 69: 330–333. doi: 10.1107/S0108270113005969
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 (, 0, ), while the H5O2+ cation is located about an inversion centre at (, , ). The compound thus represents the first oxonium alum, although the unit cell is orthorhombic.