Rhenium(IV) oxide

Rhenium(IV) oxide
	; Re O
Names
	IUPAC name Rhenium(IV) oxide
	Other names Rhenium dioxide
Identifiers
CAS Number	12036-09-8 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.031.659
EC Number	234-839-0;
PubChem CID	82847;
CompTox Dashboard (EPA)	DTXSID5065192 ;
	InChI InChI=1S/2O.Re;
	SMILES O=[Re]=O;
Properties
Chemical formula	ReO2
Molar mass	218.206 g/mol
Appearance	gray orthorhombic crystals
Density	11.4 g/cm3[1]
Melting point	decomposes at 1000 °C[2]
Solubility in water	insoluble
Solubility in alkali	insoluble
Magnetic susceptibility (χ)	+44.0·10−6 cm3/mol
Structure
Crystal structure	Orthorohmbic, oP12
Space group	Pbcn, No. 60
Hazards
NFPA 704 (fire diamond)	1 0 0
Safety data sheet (SDS)	Aldrich MSDS
Related compounds
Other anions	Rhenium(VII) oxide; Rhenium(III) oxide; Rhenium(III) chloride
Other cations	manganese(IV) oxide; Technetium(IV) oxide
	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(IV) oxide or rhenium dioxide is the inorganic compound with the formula ReO₂. This gray to black crystalline solid is a laboratory reagent that can be used as a catalyst. It adopts the rutile structure.

Synthesis and reactions

It forms via comproportionation:[3]

2 Re₂O₇ + 3 Re → 7 ReO₂

Single crystals are obtained by chemical transport, using iodine as the transporting agent.:[4]

ReO₂ + I₂ ⇌ ReO₂I₂

At high temperatures it undergoes disproportionation:

7 ReO₂ → 2 Re₂O₇ + 3 Re

It forms rhenates with alkaline hydrogen peroxide and oxidizing acids.[5] In molten sodium hydroxide it forms sodium rhenate:[6]

2 NaOH + ReO₂ → Na₂ReO₃ + H₂O

References

Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). CRC Press. p. 484. ISBN 0-8493-0594-2. Retrieved 2008-06-05.
Perry, Dale L.; Phillips, Sidney L. (1995). Handbook of Inorganic Compounds. San Diego: CRC Press. p. 328. ISBN 0-8493-8671-3. Retrieved 2008-06-05.
G. Glemser "Rhenium (IV) Oxide" Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1480.
Rogers, D. B.; Butler, S. R.; Shannon, R. D. (1972). "Single Crystals of Transition‐Metal Dioxides". Single Crystals of Transition-Metal Dioxides. Inorganic Syntheses. Vol. XIII. pp. 135–145. doi:10.1002/9780470132449.ch27. ISBN 9780470131725.
"RHENIUM DIOXIDE - Manufacturer". Aaamolybdenum.com. Archived from the original on 2003-02-09. Retrieved 2012-08-06.
G. Glemser "Sodium Rhenate (IV)" Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1483.

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[chem-1] Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). CRC Press. p. 484. ISBN 0-8493-0594-2. Retrieved 2008-06-05.

[comp-2] Perry, Dale L.; Phillips, Sidney L. (1995). Handbook of Inorganic Compounds. San Diego: CRC Press. p. 328. ISBN 0-8493-8671-3. Retrieved 2008-06-05.

[3] G. Glemser "Rhenium (IV) Oxide" Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1480.

[4] Rogers, D. B.; Butler, S. R.; Shannon, R. D. (1972). "Single Crystals of Transition‐Metal Dioxides". Single Crystals of Transition-Metal Dioxides. Inorganic Syntheses. Vol. XIII. pp. 135–145. doi:10.1002/9780470132449.ch27. ISBN 9780470131725.

[5] "RHENIUM DIOXIDE - Manufacturer". Aaamolybdenum.com. Archived from the original on 2003-02-09. Retrieved 2012-08-06.

[6] G. Glemser "Sodium Rhenate (IV)" Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1483.