View source for Chemistry:Hafnium tetrafluoride

{{chembox
| verifiedrevid = 470637858
| Name = Hafnium(IV) fluoride
| ImageFile =Kristallstruktur Uran(IV)-fluorid.png
| ImageName = Zirconium(IV) fluoride
| IUPACName = Hafnium(IV) fluoride<br/>Hafnium tetrafluoride
| OtherNames = 
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 3306631
| PubChem = 50925283
| CASNo = 13709-52-9
| CASNo_Ref = {{cascite|correct|CAS}}
| EINECS = 237-258-0
| StdInChI=1S/4FH.Hf/h4*1H;/q;;;;+4/p-4
| StdInChIKey = QHEDSQMUHIMDOL-UHFFFAOYSA-J
| SMILES = [F-].[F-].[F-].[F-].[Hf+4]
 }}
|Section2={{Chembox Properties
| Formula = HfF<sub>4</sub>
| MolarMass = 
| Appearance = white crystalline powder
| Density = 7.1 g/cm<sup>3</sup><ref name=crc>{{RubberBible92nd|page=4.66}}</ref>
| Solubility =
| MeltingPt = 
| BoilingPtC = 970
| BoilingPt_notes = (sublimes)<ref name=crc/>
 }}
|Section3={{Chembox Structure
| CrystalStruct = [[Chemistry:Monoclinic|Monoclinic]], [[Physics:Pearson symbol|mS60]]<ref>{{Cite journal | doi = 10.1107/S0365110X49001016| title = Crystal chemical studies of the 5f-series of elements. XII. New compounds representing known structure types| journal = Acta Crystallographica| volume = 2| issue = 6| pages = 388–390| year = 1949| last1 = Zachariasen | first1 = W. H.| doi-access = free}}</ref>
| SpaceGroup = C2/c, No. 15
| LattConst_a = 1.17 nm
| LattConst_b= 0.986 nm
| LattConst_c=0.764 nm
  }}
|Section7={{Chembox Hazards
| ExternalSDS = 
| NFPA-H = 
| NFPA-R = 
| NFPA-F = 
| NFPA-S =
| FlashPt = Non-flammable
| LD50 = 
 }}
|Section8={{Chembox Related
| OtherAnions = Hafnium(IV) chloride
| OtherCations = Titanium(IV) fluoride
 }}
}}

'''Hafnium tetrafluoride''' is the [[Chemistry:Inorganic compound|inorganic compound]] with the formula HfF<sub>4</sub>. It is a white solid.  It adopts the same structure as [[Chemistry:Zirconium tetrafluoride|zirconium tetrafluoride]], with 8-coordinate Hf(IV) centers.

Hafnium tetrafluoride forms a trihydrate, which has a polymeric structure consisting of octahedral Hf center, described as {{chem2|(μ\sF)2[HfF2(H20)2]}}<sub>n</sub>(H<sub>2</sub>O)<sub>n</sub> and one [[Physics:Water of crystallization|water of crystallization]].  In a rare case where the chemistry of Hf and Zr differ, the trihydrate of zirconium(IV) fluoride has a molecular structure {{chem2|(μ\sF)2[ZrF3(H20)3]2}}, without the lattice water.<ref>{{Greenwood&Earnshaw2nd|page=965}}</ref>

==References==
{{reflist}}

==Further reading==
*Benjamin, S. L., Levason, W., Pugh, D., Reid, G., Zhang, W., "Preparation and structures of coordination complexes of the very hard Lewis acids ZrF<sub>4</sub> and HfF<sub>4</sub>", Dalton Transactions 2012, 41, 12548. {{doi|10.1039/C2DT31501G}}

{{Hafnium compounds}}
{{Fluorine compounds}}

[[Category:Hafnium compounds]]
[[Category:Fluorides]]
[[Category:Metal halides]]


{{Sourceattribution|Hafnium tetrafluoride}}