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

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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.
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Document Type: Research Article

Affiliations: Institute of Inorganic Chemistry, TU Bergakademie Freiberg, Leipziger Strasse 29, D-09596 Freiberg, Germany

Publication date: April 15, 2013

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