Germanium difluoride

Germanium difluoride

200px Two unit cells of the orthorhombic GeF2 structure. Brown atoms are germanium
Names
IUPAC names Germanium difluoride Difluorogermane Difluoridogermanium
Other names Germanium(II) fluoride
Identifiers
CAS Number	13940-63-1 Y
ChemSpider	4885763 Y
Jmol 3D model	Interactive image
PubChem	6327235
InChI InChI=1S/F2Ge/c1-3-2 Y Key: GGJOARIBACGTDV-UHFFFAOYSA-N Y
SMILES F[Ge]F
Properties
Chemical formula	GeF2
Molar mass	110.61 g/mol
Appearance	White orthorhombic hygroscopic crystals
Density	3.61 g/cm3
Melting point	110 °C (230 °F; 383 K)
Boiling point	130 °C (266 °F; 403 K) (sublimates)
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Germanium difluoride (GeF₂) is a chemical compound of germanium and fluorine. It is a white solid with a melting point of 110 °C which can be produced by reacting germanium tetrafluoride with germanium powder at 150–300 °C.

Structure

Germanium difluoride forms orthorhombic crystals with a space group P2₁2₁2₁ (No. 19), Pearson symbol oP12, and lattice constants a = 0.4682 nm, b = 0.5178 nm, c = 0.8312 nm, Z = 4 (four structure units per unit cell). Its crystal structure is characterized by strong polymeric chains composed by GeF₃ pyramids. One of the fluorine atom in the pyramid is shared by two neighboring chains, providing a weak link between them. Another, less common crystal form of GeF₂ has tetragonal symmetry with a space group P4₁2₁2 (No. 92), Pearson symbol tP12, and lattice constants a = 0.487 nm, b = 0.6963 nm, c = 0.858 nm.