Rhenium heptafluoride

Rhenium heptafluoride
Names
	IUPAC name rhenium heptafluoride, heptafluoridorhenium
Identifiers
CAS Number	17029-21-9 ;
3D model (JSmol)	Interactive image;
ChemSpider	26323924 ;
PubChem CID	123369;
UNII	H54U6B0W52 ;
CompTox Dashboard (EPA)	DTXSID50168826 ;
	InChI InChI=1S/7FH.Re/h71H;/q;;;;;;;+7/p-7 Key: HFHBKXWKPQUYIA-UHFFFAOYSA-G ; InChI=1/7FH.Re/h71H;/q;;;;;;;+7/p-7/rF7Re/c1-8(2,3,4,5,6)7 Key: HFHBKXWKPQUYIA-KLJGHBABAK;
	SMILES F[Re](F)(F)(F)(F)(F)F;
Properties
Chemical formula	ReF7
Molar mass	319.196 g/mol
Appearance	Bright yellow crystalline solid
Density	4.3g/cm3
Melting point	48.3 °C (118.9 °F; 321.4 K)
Boiling point	73.72 °C (164.70 °F; 346.87 K)
Structure
Crystal structure	triclinic, aP16
Space group	P-1, No. 2
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

Rhenium heptafluoride is the compound with the formula ReF₇. It is a yellow low melting solid, and is the only thermally stable metal heptafluoride.[1] It has a distorted pentagonal bipyramidal structure similar to IF₇, which was confirmed by neutron diffraction at 1.5K.[2] The structure is non-rigid as evidenced by electron diffraction studies.[3]

It can be prepared from the elements at 400 °C:[4]

2Re + 7 F₂ → 2 ReF₇

With fluoride donors such as CsF, the ReF₈⁻ anion is formed, which has a square antiprismatic structure.[5] With antimony pentafluoride, SbF₅, a fluoride acceptor, the ReF₆⁺ cation is formed.[4]

References

Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
Vogt T.; Fitch A. N.; Cockcroft J. K. (1994). "Crystal and Molecular Structures of Rhenium Heptafluoride". Science. 263 (5151): 1265–7. doi:10.1126/science.263.5151.1265. PMID 17817431.
Jacob, E. Jean; Bartell, L.S.J. (1970). "Electron Diffraction Study of Rhenium Fluorides. II. Structure, Pseudorotation, and Anharmonic Coupling of Modes in ReF7" (PDF). The Journal of Chemical Physics. 53 (6): 2235. doi:10.1063/1.1674318.
A. F. Holleman; Wiberg, Egon; Wiberg, Nils (2001). Inorganic Chemistry. Boston: Academic Press. ISBN 0-12-352651-5.
Hwang, I; Seppelt, K. (2000). "The structures of ReF₈⁻ and UF₈²⁻". Journal of Fluorine Chemistry. 102: 69. doi:10.1016/S0022-1139(99)00248-1.

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[Greenwood-1] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

[2] Vogt T.; Fitch A. N.; Cockcroft J. K. (1994). "Crystal and Molecular Structures of Rhenium Heptafluoride". Science. 263 (5151): 1265–7. doi:10.1126/science.263.5151.1265. PMID 17817431.

[3] Jacob, E. Jean; Bartell, L.S.J. (1970). "Electron Diffraction Study of Rhenium Fluorides. II. Structure, Pseudorotation, and Anharmonic Coupling of Modes in ReF7" (PDF). The Journal of Chemical Physics. 53 (6): 2235. doi:10.1063/1.1674318.

[Wiberg&Holleman-4] A. F. Holleman; Wiberg, Egon; Wiberg, Nils (2001). Inorganic Chemistry. Boston: Academic Press. ISBN 0-12-352651-5.

[5] Hwang, I; Seppelt, K. (2000). "The structures of ReF₈⁻ and UF₈²⁻". Journal of Fluorine Chemistry. 102: 69. doi:10.1016/S0022-1139(99)00248-1.