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Hafnium(IV) sulfate

Chemical compound From Wikipedia, the free encyclopedia

Hafnium(IV) sulfate 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 salts, which are both white solids.[1]

Quick facts Names, Identifiers ...
Hafnium(IV) sulfate
Names
Other names
  • Hafnium disulfate
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/Hf.2H2O4S/c;2*1-5(2,3)4/h;2*(H2,1,2,3,4)/q+4;;/p-4
    Key: NXKAMHRHVYEHER-UHFFFAOYSA-J
  • [O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Hf+4]
  • tetrahydrate: [O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Hf+4].O.O.O.O
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
 Hafnium(IV) nitrate
Other cations
 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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Structure

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

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

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