Krypton tetrafluoride

Krypton(IV) fluoride is a hypothetical inorganic chemical compound of krypton and fluorine with the chemical formula KrF₄. At one time researchers thought they had synthesized it, but the claim was discredited.^[1] The compound is predicted to be difficult to make and unstable if made.^[2] However, it is predicted to become stable at pressures greater than 15 GPa.^[3] Theoretical analysis indicates KrF₄ would have an approximately square planar molecular geometry.^[2]

Krypton tetrafluoride

Identifiers
CAS Number	13709-53-0
3D model (JSmol)	Interactive image
CompTox Dashboard (EPA)	DTXSID901304941
InChI InChI=1S/F4Kr/c1-5(2,3)4 Key: PLAFPZRFEDSAJL-UHFFFAOYSA-N
SMILES [Kr](F)(F)(F)F
Properties
Chemical formula	F4Kr
Molar mass	159.792 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

The claimed synthesis was by passing electric discharge through krypton-fluorine mixture:^[4]

Kr + 2F₂ → KrF₄

Physical properties

The claimed compound formed white crystalline solid.^[5] Thermally, it is less stable than XeF₄.^[6]