:Germanium tetrafluoride
{{chembox
| verifiedrevid = 402139527
| Name = Germanium tetrafluoride
| ImageFile1 = Germanium tetrafluoride.svg
| IUPACName = Germanium tetrafluoride
Tetrafluorogermane
Tetrafluoridogermanium
| OtherNames = Germanium(IV) fluoride
Germanium fluoride
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 74195
| SMILES = F[Ge](F)(F)F
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = InChI=1S/F4Ge/c1-5(2,3)4
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = PPMWWXLUCOODDK-UHFFFAOYSA-N
| CASNo = 7783-58-6
| CASNo_Ref = {{cascite|correct|CAS}}
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = X83T8V2NRK
| PubChem = 82215
| RTECS =
| EINECS = 232-011-3
}}
|Section2={{Chembox Properties
| Properties_ref ={{RubberBible86th|page=4.64}}
| Formula = GeF4
| MolarMass = 148.634 g/mol
| Appearance = colourless gas
| Density = 6.074 g/L (gas), 2.46 g/mL (liquid)
| Solubility =
| SolubleOther =
| MeltingPtC = −15
| MeltingPt_notes = at 4 bar
| BoilingPtC = −36.5
| BoilingPt_notes = sublimates
| Viscosity =
| RefractIndex =
| MagSus = −50.0·10−6 cm3/mol
}}
|Section3={{Chembox Structure
| MolShape = tetrahedral
| Dipole =
}}
|Section5={{Chembox Thermochemistry
| DeltaHf = −8.008 kJ/g
}}
|Section7={{Chembox Hazards
| ExternalSDS =
| MainHazards = Reacts with water to form HF, corrosive
| NFPA-H = 3
| NFPA-F = 0
| NFPA-R = 2
| NFPA-S = W
| FlashPt = Non-flammable
| GHSPictograms = {{GHS05}}{{GHS06}}{{GHS08}}
| GHSSignalWord = Danger
| HPhrases = {{H-phrases|314|331|372}}
| PPhrases = {{P-phrases|260|261|264|270|271|280|301+330+331|303+361+353|304+340|305+351+338|310|311|314|321|363|403+233|405|410+403|501}}
}}
|Section8={{Chembox Related
| OtherAnions = Germanium tetrachloride
Germanium tetrabromide
Germanium tetraiodide
| OtherCations = Carbon tetrafluoride
Silicon tetrafluoride
Tin tetrafluoride
Lead tetrafluoride
| OtherCompounds = Germanium difluoride
}}
}}
Germanium tetrafluoride (GeF4) is a chemical compound of germanium and fluorine. It is a colorless gas.
Synthesis
Germanium tetrafluoride is formed by treating germanium with fluorine:
: Ge + 2 F2 → GeF4
Alternatively germanium dioxide combines with hydrofluoric acid (HF):
: GeO2 + 4 HF → GeF4 + 2 H2O
It is also formed during the thermal decomposition of a complex salt, Ba[GeF6]:
: Ba(GeF6) → GeF4 + BaF2
Properties
Germanium tetrafluoride is a noncombustible, strongly fuming gas with a garlic-like odor. It reacts with water to form hydrofluoric acid and germanium dioxide. Decomposition occurs above 1000 °C.
Reaction of GeF4 with fluoride sources produces GeF5− anions with octahedral coordination around Ge atom due to polymerization.{{cite journal|last1=Mallouk|first1=T. E.|last2=Desbat|first2=B.|last3=Bartlett|first3=N.|year=1984|title=Structural Studies of salts of cis and trans μ-Fluoro-Bridged Polymers of Pentafluorogermanate(1-) and of the Pentafluorogermanate(1-) Monomer|journal=Inorganic Chemistry|volume=23|issue=20|pages=3160–3166|doi=10.1021/ic00188a027}} The structural characterization of a discrete trigonal bipyramidal GeF5− anion was achieved by a "naked" fluoride reagent 1,3-bis(2,6-diisopropylphenyl)imidazolium fluoride.{{cite journal|last1=Alič|first1=B.|last2=Tramšek|first2=M.|last3=Kokalj|first3=A.|last4=Tavčar|first4=G.|year=2017|title=Discrete GeF5– Anion Structurally Characterized with a Readily Synthesized Imidazolium Based Naked Fluoride Reagent|journal=Inorganic Chemistry|volume=56|issue=16|pages=10070–10077|doi=10.1021/acs.inorgchem.7b01606|pmid=28792216}}
Uses
In combination with disilane, germanium tetrafluoride is used for in the synthesis of SiGe.
References
External links
- [https://www.youtube.com/watch?v=Y7Glknmiiz4 "Reactivity of a Naked Fluoride Reagent and Controlled Design of Germanium Fluorido-Anions."]
{{Germanium compounds}}
{{fluorine compounds}}