Synthesis, structure, and properties of chromium(III) sulfates |
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| Authors: | Tom David Atkinson |
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| Affiliation: | Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway |
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| Abstract: | Reactions between CrO3 and 50- are studied at temperatures up to the boiling point of the acid. Depending on the H2SO4 concentration and synthesis temperature, Cr2(SO4)3, CrH(SO4)2, (H3O)[Cr(SO4)2], Cr2(SO4)3·H2SO4·4H2O (gross formula), and (H5O2)[Cr(H2O)2(SO4)2], are obtained as identified reaction products in addition to the incompletely characterized chromic-sulfuric acid. The CrIII-based sulfates are characterized by X-ray powder diffraction, thermogravimetric, and magnetic susceptibility measurements. The nuclear and magnetic structures of Cr2(SO4)3 at  are determined, the structure type of (H3O)[Cr(SO4)2] is established, and the crystal structure of (H5O2)[Cr(H2O)2(SO4)2] is firmly stipulated. Magnetic susceptibility data suggest that the samples of CrH(SO4)2 are in a micro-crystalline rather than in an amorphous state. All CrIII-based sulfates synthesized in this study appear to undergo paramagnetic-to-antiferromagnetic transitions at around  . |
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| Keywords: | Synthesis in concentrated sulfuric acid CrIII-based sulfates Magnetic properties of CrIII-based sulfates Magnetic structure of Cr2(SO4)3 |
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