Rhodium(IV) oxide

Rhodium(IV) oxide

Identifiers
CAS Number	12137-27-8^N
3D model (JSmol)	Interactive image
ChemSpider	15017693^Y
ECHA InfoCard	100.032.021
EC Number	235-237-0
PubChem CID	82936
CompTox Dashboard (EPA)	DTXSID2065254
InChI InChI=1S/2O.Rh/q2*-2;+4^Y Key: ZLDSZHMBHVKLCB-UHFFFAOYSA-N^Y InChI=1/2O.Rh/q2*-2;+4 Key: ZLDSZHMBHVKLCB-UHFFFAOYAD
SMILES [Rh+4].[O-2].[O-2]
Properties
Chemical formula	RhO2
Molar mass	134.904 g/mol
Appearance	black crystalline solid
Density	7.2 g/cm^3
Melting point	1,050 °C (1,920 °F; 1,320 K) (decomposes)
Solubility	insoluble in aqua regia
Structure
Crystal structure	tetragonal (rutile)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references

Rhodium(IV) oxide (or rhodium dioxide) is the chemical compound with the formula RhO₂.

Chemical properties

RhO₂ is highly insoluble even in hot aqua regia.[1]

Structure

RhO₂ has the tetragonal rutile structure.[2]

Physical properties

RhO₂ has metallic resistivity with values <10^−4 Ohm·cm. It transforms in air to Rh₂O₃ at 850 °C and then to metal and oxygen at 1050 °C.[2]

See also

• Rhodium

References

1. O. Muller and R. Roy (1968). "Formation and stability of the platinum and rhodium oxides at high oxygen pressures and the structures of Pt₃O₄, β-PtO₂ and RhO₂". Journal of the Less Common Metals. 16 (2): 129–146. doi:10.1016/0022-5088(68)90070-2.
2. R. D. Shannon (1968). "Synthesis and properties of two new members of the rutile family RhO₂ and PtO₂". Solid State Communications. 6 (3): 139–143. Bibcode:1968SSCom...6..139S. doi:10.1016/0038-1098(68)90019-7.