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Chemical compound
Hafnium(IV) sulfate is describes the inorganic chemical compounds with the formula Hf(SO4)2·"n"H2O, where "n" can range from 0 to 7. It commonly forms the anhydrous and tetrahydrate forms, which are both white solids.
Structure.
Anhydrous hafnium(IV) sulfate consists of a polymeric network of sulfate-bridged hafnium atoms. It is isomorphous with zirconium(IV) sulfate.
Hafnium(IV) sulfate tetrahydrate is isomorphous with zirconium(IV) sulfate tetrahydrate and consists of repeated sheets of Hf(SO4)2(H2O)4, where the sulfate ligands are bidentate.
Preparation and properties.
The tetrahydrate is produced by the reaction of hafnium metal or hafnium(IV) oxide with concentrated sulfuric acid followed by evaporation of the solution:
Hf + 2 H2SO4 → Hf(SO4)2 + 2 H2
The anhydrous form can be produced by heating the tetrahydrate to 350 °C. If the anhydrous is heated to 820 °C, it decomposes to hafnium(IV) oxide, sulfur oxides, and oxygen. The mechanism of decomposition has not been fully elucidated.
Various hydrolyzed derivatives of hafnium(IV) oxide, such as are known.
References.
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