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| Section1 = {{Chembox Identifiers | Section1 = {{Chembox Identifiers
| index2_label=tetrahydrate
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| Abbreviations = | CASNo = 15823-43-5
| Beilstein = | ChemSpiderID = 16019775
| CASNo = | PubChem = 13094115
| StdInChI=1S/Hf.2H2O4S/c;2*1-5(2,3)4/h;2*(H2,1,2,3,4)/q+4;;/p-4
| CASNo_Comment =
| StdInChIKey = NXKAMHRHVYEHER-UHFFFAOYSA-J
| CASNoOther =
| SMILES = S(=O)(=O).S(=O)(=O).
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| SMILES2 = S(=O)(=O).S(=O)(=O)..O.O.O.O
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| Appearance = White solid<ref name="phase">{{cite journal |author1=I.J. Bear |author2=W.G. Mumme |title=The preparation and characterization of phases in the Hf(SO4)2H2O system |journal=Journal of Inorganic and Nuclear Chemistry |date=1970 |volume=32 |issue=4 |pages=1159-1164 |doi=10.1016/0022-1902(70)80110-5 |language=en}}</ref> | Appearance = White solid<ref name="phase">{{cite journal |author1=I.J. Bear |author2=W.G. Mumme |title=The preparation and characterization of phases in the Hf(SO4)2H2O system |journal=Journal of Inorganic and Nuclear Chemistry |date=1970 |volume=32 |issue=4 |pages=1159–1164 |doi=10.1016/0022-1902(70)80110-5 |language=en}}</ref>
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| Density = 4.86 g/cm<sup>3</sup><ref name="phase" /> | Density = 4.86 g/cm<sup>3</sup><ref name="phase" />
| Formula = Hf(SO<sub>4</sub>)<sub>2</sub> | Formula = Hf(SO<sub>4</sub>)<sub>2</sub>
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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 ]. The mechanism of decomposition has not been fully elucidated.<ref name="decomp" /> 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 ]. The mechanism of decomposition has not been fully elucidated.<ref name="decomp" />


Various hydrolyzed derivatives of hafnium(IV) oxide, such as {{chem2|Cl0.6·nH2O}}.<ref>{{cite journal |author1=Ali Kalaji |author2=L. Soderholm |title=Aqueous Hafnium Sulfate Chemistry: Structures of Crystalline Precipitates |journal=Inorganic Chemistry |date=2014 |volume=53 |issue=20 |pages=11252–11260 |doi=10.1021/ic501841e |language=en}}</ref> Various hydrolyzed derivatives of hafnium(IV) oxide, such as {{chem2|Cl0.6·nH2O}} are known.<ref>{{cite journal |author1=Ali Kalaji |author2=L. Soderholm |title=Aqueous Hafnium Sulfate Chemistry: Structures of Crystalline Precipitates |journal=Inorganic Chemistry |date=2014 |volume=53 |issue=20 |pages=11252–11260 |doi=10.1021/ic501841e |pmid=25299984 |language=en}}</ref>


==References== ==References==

Latest revision as of 23:04, 20 December 2024

Hafnium(IV) sulfate
Names
Other names
  • Hafnium disulfate
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/Hf.2H2O4S/c;2*1-5(2,3)4/h;2*(H2,1,2,3,4)/q+4;;/p-4Key: NXKAMHRHVYEHER-UHFFFAOYSA-J
SMILES
  • S(=O)(=O).S(=O)(=O).
  • tetrahydrate: S(=O)(=O).S(=O)(=O)..O.O.O.O
Properties
Chemical formula Hf(SO4)2
Molar mass 370.62 g/mol (anhydrous)
Appearance White solid
Density 4.86 g/cm
Melting point 350 °C (662 °F; 623 K) (decomposition)
Solubility in water Soluble
Structure
Crystal structure Orthorhombic
Coordination geometry 8 (hafnium)
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 , 100 kPa). Infobox references
Chemical compound

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.

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 [Hf18O10(OH)26(SO4)12.7(H2O)20]Cl0.6·nH2O are known.

References

  1. ^ I.J. Bear; W.G. Mumme (1970). "The preparation and characterization of phases in the Hf(SO4)2H2O system". Journal of Inorganic and Nuclear Chemistry. 32 (4): 1159–1164. doi:10.1016/0022-1902(70)80110-5.
  2. ^ 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.
  3. 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.
Hafnium compounds
Hf(II)
Hf(III)
Hf(IV)
Compounds containing the sulfate group (SO2−4)
H2SO4 He
Li2SO4 BeSO4 B2S2O9
-BO3
+BO3 		esters
ROSO−3
(RO)2SO2
+CO3
+C2O4 		(NH4)2SO4
[N2H5]HSO4
(NH3OH)2SO4
NOHSO4
+NO3 		H2OSO4 +F Ne
Na2SO4
NaHSO4 		MgSO4 Al2(SO4)3
Al2SO4(OAc)4 		Si +PO4 SO2−4
HSO3HSO4
(HSO4)2
+SO3 		+Cl Ar
K2SO4
KHSO4 		CaSO4 Sc2(SO4)3 TiOSO4 VSO4
V2(SO4)3
VOSO4 		CrSO4
Cr2(SO4)3 		MnSO4 FeSO4
Fe2(SO4)3 		CoSO4
Co2(SO4)3 		NiSO4
Ni2(SO4)3 		CuSO4
Cu2SO4
SO4 		ZnSO4 Ga2(SO4)3 Ge(SO4)2 As +SeO3 +Br Kr
RbHSO4
Rb2SO4 		SrSO4 Y2(SO4)3 Zr(SO4)2 Nb2O2(SO4)3 MoO(SO4)2
MoO2(SO4) 		Tc Ru(SO4)2 Rh2(SO4)3 PdSO4 Ag2SO4
AgSO4 		CdSO4 In2(SO4)3 SnSO4
Sn(SO4)2 		Sb2(SO4)3 TeOSO4 I2(SO4)3
(IO)2SO4
+IO3 		Xe
Cs2SO4
CsHSO4 		BaSO4 * Lu2(SO4)3 Hf(SO4)2 Ta WO(SO4)2 Re2O5(SO4)2 OsSO4
Os2(SO4)3
Os(SO4)2 		IrSO4
Ir2(SO4)3 		Pt2(SO4)5 AuSO4
Au2(SO4)3 		Hg2SO4
HgSO4 		Tl2SO4
Tl2(SO4)3 		PbSO4
Pb(SO4)2 		Bi2(SO4)3 PoSO4
Po(SO4)2 		At Rn
Fr RaSO4 ** Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
 
* La2(SO4)3 Ce2(SO4)3
Ce(SO4)2 		Pr2(SO4)3 Nd2(SO4)3 Pm2(SO4)3 Sm2(SO4)3 EuSO4
Eu2(SO4)3 		Gd2(SO4)3 Tb2(SO4)3 Dy2(SO4)3 Ho2(SO4)3 Er2(SO4)3 Tm2(SO4)3 Yb2(SO4)3
** Ac2(SO4)3 Th(SO4)2 Pa U2(SO4)3
U(SO4)2
UO2SO4 		Np(SO4)2 Pu(SO4)2 Am2(SO4)3 Cm2(SO4)3 Bk Cf2(SO4)3 Es Fm Md No
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