Rhenium(IV) oxide

Rhenium(IV) oxide

Re      O
Names
IUPAC name Rhenium(IV) oxide
Other names Rhenium dioxide
Identifiers
CAS Number	12036-09-8
EC Number	234-839-0
Jmol interactive 3D	Image
PubChem	82847
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/cm^3[1]
Melting point	decomposes at 1000 °C[2]
Solubility in water	insoluble
Solubility in alkali	insoluble
Structure
Crystal structure	Orthorohmbic, oP12
Space group	Pbcn, No. 60
Hazards
Safety data sheet	Aldrich MSDS
NFPA 704	0 1 0
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).
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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

At high temperatures it undergoes disproportionation:

7 ReO₂ → 2 Re₂O₇ + 3 Re

It forms perrhenates with alkaline hydrogen peroxide and oxidizing acids.^[4] In molten sodium hydroxide it forms sodium rhenate:^[5]

2 NaOH + ReO₂ → Na₂ReO₃ + H₂O

References

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.
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. "RHENIUM DIOXIDE - Manufacturer". Aaamolybdenum.com. Retrieved 2012-08-06.
5. G. Glemser "Sodium Rhenate (IV)" Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1483.