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 = HfF₄ | MolarMass = | Appearance = white crystalline powder | Density = 7.1 g/cm³<ref name=crc>{{RubberBible92nd|page=4.66}}</ref> | Solubility = | MeltingPt = | BoilingPtC = 970 | BoilingPt_notes = (sublimes)<ref name=crc/> }} |Section3={{Chembox Structure | CrystalStruct = Monoclinic, 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 inorganic compound with the formula HfF₄. It is a white solid. It adopts the same structure as 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]}}_n(H₂O)_n and one 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 ZrF₄ and HfF₄", Dalton Transactions 2012, 41, 12548. {{doi|10.1039/C2DT31501G}}

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

Category:Hafnium compounds Category:Fluorides Category:Metal halides

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