Hafnium(IV) sulfate
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Other names
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3D model (JSmol)
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| Hf(SO4)2 | |
| Molar mass | 370.62 g/mol (anhydrous) |
| Appearance | White solid[1] |
| Density | 4.86 g/cm3[1] |
| Melting point | 350 °C (662 °F; 623 K)[2] (decomposition) |
| Soluble[1] | |
| Structure | |
| Orthorhombic[1] | |
| 8 (hafnium)[1] | |
| Related compounds | |
Other anions
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Hafnium(IV) nitrate |
Other cations
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Zirconium(IV) sulfate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Hafnium(IV) sulfate is describes the inorganic chemical compounds with the formula Hf(SO4)2·nH2O, where n can range from 0 to 7. It commonly forms the anhydrous and tetrahydrate forms, which are both white solids.[1]
Structure
[edit]Anhydrous hafnium(IV) sulfate consists of a polymeric network of sulfate-bridged hafnium atoms. It is isomorphous with zirconium(IV) sulfate.[1]
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.[1]
Preparation and properties
[edit]The tetrahydrate is produced by the reaction of hafnium metal or hafnium(IV) oxide with concentrated sulfuric acid followed by evaporation of the solution:[1]
- 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.[2]
Various hydrolyzed derivatives of hafnium(IV) oxide, such as [Hf18O10(OH)26(SO4)12.7(H2O)20]Cl0.6·nH2O are known.[3]
References
[edit]- ^ a b c d e f g h i I.J. Bear; W.G. Mumme (1970). "The preparation and characterization of phases in the Hf(SO4)2H2O system". Journal of Inorganic and Nuclear Chemistry. 32 (4): 1159–1164. doi:10.1016/0022-1902(70)80110-5.
- ^ a b H.A. Papazian; P.J. Pizzolato; R.R. Orrell (1972). "The Thermal Decomposition of Aluminum Sulfate and Hafnium Sulfate". Thermochimica Acta. 4 (2): 97–103. Bibcode:1972TcAc....4...97P. doi:10.1016/S0040-6031(72)80023-6.
- ^ Ali Kalaji; L. Soderholm (2014). "Aqueous Hafnium Sulfate Chemistry: Structures of Crystalline Precipitates". Inorganic Chemistry. 53 (20): 11252–11260. doi:10.1021/ic501841e. PMID 25299984.