Rhenium(VII) oxide

Rhenium(VII) oxide
Names
	Other names Rhenium heptoxide
Identifiers
CAS Number	1314-68-7 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.013.857
EC Number	215-241-9;
PubChem CID	123106;
UNII	0DJ421156F ;
CompTox Dashboard (EPA)	DTXSID00894901 ;
	InChI Key: NBGOSNNAAHDRLK-UHFFFAOYSA-N; InChI=1S/7O.2Re;
	SMILES O=[Re](=O)(=O)O[Re](=O)(=O)=O;
Properties
Chemical formula	Re2O7
Molar mass	484.40298 g/mol
Appearance	yellow crystalline powder
Density	6.103 g/cm3, solid
Melting point	360 °C (680 °F; 633 K)
Boiling point	sublime
Solubility in water	Hydrolyses
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P260, P264, P280, P301 P330 P331, P303 P361 P353, P304 P340, P305 P351 P338, P310, P321, P363, P405, P501
Related compounds
Related compounds	Manganese(VII) oxide; technetium(VII) oxide; perrhenic acid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Rhenium(VII) oxide is the inorganic compound with the formula Re₂ O₇. This yellowish solid is the anhydride of HOReO₃. Perrhenic acid, Re₂O₇·2H₂O, is closely related to Re₂O₇. Re₂O₇ is the raw material for all rhenium compounds, being the volatile fraction obtained upon roasting the host ore.^[2]

Structure

Solid Re₂O₇ consists of alternating octahedral and tetrahedral Re centres. Upon heating, the polymer cracks to give molecular (nonpolymeric) Re₂O₇. This molecular species closely resembles manganese heptoxide, consisting of a pair of ReO₄ tetrahedra that share a vertex, i.e., O₃Re–O–ReO₃.^[3]

Synthesis and reactions

Rhenium(VII) oxide is formed when metallic rhenium or its oxides or sulfides are oxidized at 500–700 °C (900–1,300 °F) in air.^[4]

Re₂O₇ dissolves in water to give perrhenic acid.

Heating Re₂O₇ gives rhenium dioxide, a reaction signalled by the appearance of the dark blue coloration:^[5]

2Re₂O₇ → 4ReO₂ 3O₂

Using tetramethyltin, it converts to methylrhenium trioxide ("MTO"), a catalyst for oxidations:^[6]

Re₂O₇ 2Sn(CH₃)₄ → CH₃ReO₃ (CH₃)₃SnOReO₃

In a related reaction, it reacts with hexamethyldisiloxane to give the siloxide:^[4]

Re₂O₇ 2O(Si(CH₃)₃)₂ → 2(CH₃)₃SiOReO₃

Uses

Hydrogenation catalyst

Rhenium(VII) oxide finds some use in organic synthesis as a catalyst for ethenolysis,^[7] carbonyl reduction and amide reduction.^[8]

References

^ "Rhenium(VII) oxide". pubchem.ncbi.nlm.nih.gov. Retrieved 14 December 2021.
^ Georg Nadler, Hans (2000). "Rhenium and Rhenium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a23_199. ISBN 3527306730.
^ Wells, A.F. (1984). Structural Inorganic Chemistry. Oxford: Clarendon Press. ISBN 0-19-855370-6.
^ ^a ^b Schmidt, Max; Schmidbaur, Hubert (1967). Trimethylsilyl Perrhenate. Inorganic Syntheses. Vol. 9. pp. 149–151. doi:10.1002/9780470132401.ch40. ISBN 9780470132401.149-151&rft.date=1967&rft_id=info:doi/10.1002/9780470132401.ch40&rft.isbn=9780470132401&rft.aulast=Schmidt&rft.aufirst=Max&rft.au=Schmidbaur, Hubert&rfr_id=info:sid/en.wikipedia.org:Rhenium(VII) oxide" class="Z3988">
^ Glemser, O. (1963). "Rhenium". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry. Vol. 1 (2nd ed.). Academic Press. pp. 1476–1485.1476-1485&rft.edition=2nd&rft.pub=Academic Press&rft.date=1963&rft.aulast=Glemser&rft.aufirst=O.&rft_id=https://archive.org/details/Handbook_of_Preparative_Inorganic_Chemistry_1_2_Brauer/page/n1522&rfr_id=info:sid/en.wikipedia.org:Rhenium(VII) oxide" class="Z3988">
^ W. A. Herrmann; F. E. Kuhn (1997). "Organorhenium Oxides". Acc. Chem. Res. 30 (4): 169–180. doi:10.1021/ar9601398.169-180&rft.date=1997&rft_id=info:doi/10.1021/ar9601398&rft.au=W. A. Herrmann&rft.au=F. E. Kuhn&rfr_id=info:sid/en.wikipedia.org:Rhenium(VII) oxide" class="Z3988">
^ Lionel Delaude; Alfred F. Noels, "Metathesis", Kirk-Othmer Encyclopedia of Chemical Technology, New York: John Wiley, doi:10.1002/0471238961.metanoel.a01, ISBN 9780471238966
^ Nishimura, Shigeo (2001). Handbook of Heterogeneous Catalytic Hydrogenation for Organic Synthesis (1st ed.). New York: Wiley-Interscience. pp. 42–43, 182, 389–390, & 408. ISBN 978-0-471-39698-7.42-43, 182, 389-390, & 408&rft.edition=1st&rft.pub=Wiley-Interscience&rft.date=2001&rft.isbn=978-0-471-39698-7&rft.aulast=Nishimura&rft.aufirst=Shigeo&rft_id=https://books.google.com/books?id=RjZRAAAAMAAJ&q=0471396982&rfr_id=info:sid/en.wikipedia.org:Rhenium(VII) oxide" class="Z3988">

[1] "Rhenium(VII) oxide". pubchem.ncbi.nlm.nih.gov. Retrieved 14 December 2021.

[2] Georg Nadler, Hans (2000). "Rhenium and Rhenium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a23_199. ISBN 3527306730.

[3] Wells, A.F. (1984). Structural Inorganic Chemistry. Oxford: Clarendon Press. ISBN 0-19-855370-6.

[Schmidt-4] Schmidt, Max; Schmidbaur, Hubert (1967). Trimethylsilyl Perrhenate. Inorganic Syntheses. Vol. 9. pp. 149–151. doi:10.1002/9780470132401.ch40. ISBN 9780470132401.149-151&rft.date=1967&rft_id=info:doi/10.1002/9780470132401.ch40&rft.isbn=9780470132401&rft.aulast=Schmidt&rft.aufirst=Max&rft.au=Schmidbaur, Hubert&rfr_id=info:sid/en.wikipedia.org:Rhenium(VII) oxide" class="Z3988">

[Brauer-5] Glemser, O. (1963). "Rhenium". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry. Vol. 1 (2nd ed.). Academic Press. pp. 1476–1485.1476-1485&rft.edition=2nd&rft.pub=Academic Press&rft.date=1963&rft.aulast=Glemser&rft.aufirst=O.&rft_id=https://archive.org/details/Handbook_of_Preparative_Inorganic_Chemistry_1_2_Brauer/page/n1522&rfr_id=info:sid/en.wikipedia.org:Rhenium(VII) oxide" class="Z3988">

[6] W. A. Herrmann; F. E. Kuhn (1997). "Organorhenium Oxides". Acc. Chem. Res. 30 (4): 169–180. doi:10.1021/ar9601398.169-180&rft.date=1997&rft_id=info:doi/10.1021/ar9601398&rft.au=W. A. Herrmann&rft.au=F. E. Kuhn&rfr_id=info:sid/en.wikipedia.org:Rhenium(VII) oxide" class="Z3988">

[KO-7] Lionel Delaude; Alfred F. Noels, "Metathesis", Kirk-Othmer Encyclopedia of Chemical Technology, New York: John Wiley, doi:10.1002/0471238961.metanoel.a01, ISBN 9780471238966

[8] Nishimura, Shigeo (2001). Handbook of Heterogeneous Catalytic Hydrogenation for Organic Synthesis (1st ed.). New York: Wiley-Interscience. pp. 42–43, 182, 389–390, & 408. ISBN 978-0-471-39698-7.42-43, 182, 389-390, & 408&rft.edition=1st&rft.pub=Wiley-Interscience&rft.date=2001&rft.isbn=978-0-471-39698-7&rft.aulast=Nishimura&rft.aufirst=Shigeo&rft_id=https://books.google.com/books?id=RjZRAAAAMAAJ&q=0471396982&rfr_id=info:sid/en.wikipedia.org:Rhenium(VII) oxide" class="Z3988">

[2]

[1]

[3]

[4]

[5]

[6]

[7]

[8]