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 ;
	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	4.3 g/cm3
Melting point	48.3 °C (118.9 °F; 321.4 K)
Boiling point	73.72 °C (164.70 °F; 346.87 K)
Solubility in water	Reacts
Vapor pressure	13.41 kPa
Structure
Crystal structure	triclinic, aP16
Space group	P1 (No. 2)
Thermochemistry
Enthalpy of fusion (ΔfH⦵fus)	7.53 kJ/mol
Related compounds
Related compounds	Osmium heptafluoride
	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

Template:Chembox DeltaHvap

Rhenium heptafluoride is the compound with the formula ReF₇. It is a yellow low melting solid and is the only thermally stable metal heptafluoride.^[2] It has a distorted pentagonal bipyramidal structure similar to IF₇, which was confirmed by neutron diffraction at 1.5 K.^[3] The structure is non-rigid, as evidenced by electron diffraction studies.^[4]

Production, reactions and properties

Rhenium heptafluoride can be prepared from the elements at 400 °C:^[5]

2 Re + 7 F₂ → 2 ReF₇

It also can be produced by the explosion of rhenium metal under sulfur hexafluoride. ^[6]

It hydrolyzes under a base to form perrhenic acid and hydrogen fluoride:^[1]

ReF₇ + 4H₂O → HReO₄ + 7HF

With fluoride donors such as CsF, the ReF−8 anion is formed, which has a square antiprismatic structure.^[7] With antimony pentafluoride, SbF₅, a fluoride acceptor, the ReF+6 cation is formed.^[5]

References

↑ ^1.0 ^1.1 ^1.2 ^1.3 J.G.Malm; H.Selig (1961). "The vapour-pressures and other properties of ReF6 and ReF7" (in English). Journal of Inorganic and Nuclear Chemistry 20 (3): 189–197. doi:10.1016/0022-1902(61)80267-4.
↑ 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. Bibcode: 1994Sci...263.1265V.
↑ Jacob, E. Jean; Bartell, L.S.J. (1970). "Electron Diffraction Study of Rhenium Fluorides. II. Structure, Pseudorotation, and Anharmonic Coupling of Modes in ReF7". The Journal of Chemical Physics 53 (6): 2235. doi:10.1063/1.1674318. Bibcode: 1970JChPh..53.2235J. https://deepblue.lib.umich.edu/bitstream/2027.42/70852/2/JCPSA6-53-6-2235-1.pdf.
↑ ^5.0 ^5.1 A. F. Holleman; Wiberg, Egon; Wiberg, Nils (2001). Inorganic Chemistry. Boston: Academic Press. ISBN 0-12-352651-5.
↑ Richard L. Johnson; Bernard Siegel (1969). "On the synthesis of ReF7 and the existence of ReF2 and ReF3" (in English). Journal of Inorganic and Nuclear Chemistry 31 (8): 2391–2396. doi:10.1016/0022-1902(69)80569-5.
↑ Hwang, I; Seppelt, K. (2000). "The structures of ReF−8 and UF2−8". Journal of Fluorine Chemistry 102 (1–2): 69–72. doi:10.1016/S0022-1139(99)00248-1.ReF−8+and+UF2−8&rft.jtitle=Journal+of+Fluorine+Chemistry&rft.aulast=Hwang,+I&rft.au=Hwang,+I&rft.au=Seppelt,+K.&rft.date=2000&rft.volume=102&rft.issue=1–2&rft.pages=69–72&rft_id=info:doi/10.1016/S0022-1139(99)00248-1&rfr_id=info:sid/en.wikibooks.org:Chemistry:Rhenium_heptafluoride">

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[ref7good-1] 1.0 ^1.1 ^1.2 ^1.3 J.G.Malm; H.Selig (1961). "The vapour-pressures and other properties of ReF6 and ReF7" (in English). Journal of Inorganic and Nuclear Chemistry 20 (3): 189–197. doi:10.1016/0022-1902(61)80267-4.

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

[3] 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. Bibcode: 1994Sci...263.1265V.

[4] Jacob, E. Jean; Bartell, L.S.J. (1970). "Electron Diffraction Study of Rhenium Fluorides. II. Structure, Pseudorotation, and Anharmonic Coupling of Modes in ReF7". The Journal of Chemical Physics 53 (6): 2235. doi:10.1063/1.1674318. Bibcode: 1970JChPh..53.2235J. https://deepblue.lib.umich.edu/bitstream/2027.42/70852/2/JCPSA6-53-6-2235-1.pdf.

[Wiberg&Holleman-5] 5.0 ^5.1 A. F. Holleman; Wiberg, Egon; Wiberg, Nils (2001). Inorganic Chemistry. Boston: Academic Press. ISBN 0-12-352651-5.

[6] Richard L. Johnson; Bernard Siegel (1969). "On the synthesis of ReF7 and the existence of ReF2 and ReF3" (in English). Journal of Inorganic and Nuclear Chemistry 31 (8): 2391–2396. doi:10.1016/0022-1902(69)80569-5.

[7] Hwang, I; Seppelt, K. (2000). "The structures of ReF−8 and UF2−8". Journal of Fluorine Chemistry 102 (1–2): 69–72. doi:10.1016/S0022-1139(99)00248-1.ReF−8+and+UF2−8&rft.jtitle=Journal+of+Fluorine+Chemistry&rft.aulast=Hwang,+I&rft.au=Hwang,+I&rft.au=Seppelt,+K.&rft.date=2000&rft.volume=102&rft.issue=1–2&rft.pages=69–72&rft_id=info:doi/10.1016/S0022-1139(99)00248-1&rfr_id=info:sid/en.wikibooks.org:Chemistry:Rhenium_heptafluoride">