Germanium difluoride : Structure Wikipedia, the free encyclopedia

Germanium difluoride

Germanium difluoride
Names
Two unit cells of the orthorhombic GeF₂ structure. Brown atoms are germanium and cyan atoms are fluorine
IUPAC names Germanium difluoride Difluorogermylidene Difluoridogermanium
Other names Germanium(II) fluoride
Identifiers
CAS Number	13940-63-1^Y
3D model (JSmol)	Interactive image
ChemSpider	4885763^Y
PubChem CID	6327235
CompTox Dashboard (EPA)	DTXSID30930462
InChI InChI=1S/F2Ge/c1-3-2^Y Key: GGJOARIBACGTDV-UHFFFAOYSA-N^Y
SMILES F[Ge]F
Properties^[1]
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)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Reacts with water to form HF, corrosive
Related compounds
Related compounds	Germanium tetrafluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Chemical compound

Germanium difluoride (GeF₂) is a chemical compound of germanium and fluorine. It is a white solid with a melting point of 110 °C, and can be produced by reacting germanium tetrafluoride with germanium powder at 150–300 °C.^[2]

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.^[3] 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.^[4]

References

^ Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. p. 4.64. ISBN 0-8493-0486-5.
^ Greenwood, N. N.; Earnshaw, A. (1998). Chemistry of the Elements (second ed.). Butterworth Heinemann. pp. 376–377. ISBN 0-7506-3365-4.
^ Trotter, James; Akhtar, M.; Bartlett, Neil (1966). "The crystal structure of germanium difluoride". Journal of the Chemical Society A: Inorganic, Physical, Theoretical: 30. doi:10.1039/J19660000030.
^ G.P. Adams; L.M. Albritton; D.W. Bonnell; J.L. Margrave; J. Scott; P.W. Wilson (1971). "A new solid phase in germanium difluoride". Journal of the Less Common Metals. 24 (1): 113–116. doi:10.1016/0022-5088(71)90174-3.