Rubidium oxide

Rubidium oxide

Names
IUPAC name Rubidium oxide
Other names Rubidium(I) oxide Dirubidium oxide
Identifiers
CAS Number	18088-11-4 Y
3D model (JSmol)	Interactive image
ChemSpider	8329869
ECHA InfoCard	100.038.161
PubChem CID	10154361
CompTox Dashboard (EPA)	DTXSID001014305
InChI InChI=1S/O.2Rb/q-2;2*+1 Key: YIONJVUULJNSMK-UHFFFAOYSA-N
SMILES [Rb+].[O-2].[Rb+]
Properties
Chemical formula	Rb2O
Molar mass	186.94 g/moL
Appearance	Yellow solid
Density	4 g/cm3
Melting point	>500 °C
Solubility in water	Reacts to give RbOH
Magnetic susceptibility (χ)	+1527.0·10−6 cm3/mol
Structure
Crystal structure	Antifluorite (cubic), cF12
Space group	Fm3m, No. 225
Coordination geometry	Tetrahedral (Rb+); cubic (O2−)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Corrosive, reacts violently with water
NFPA 704 (fire diamond)	3 0 1 W
Flash point	Non-flammable
Related compounds
Other anions	Rubidium sulfide Rubidium selenide Rubidium telluride Rubidium polonide
Other cations	Lithium oxide Sodium oxide Potassium oxide Caesium oxide
Related rubidium oxides	Rubidium suboxide Rubidium peroxide Rubidium sesquioxide Rubidium superoxide Rubidium ozonide
Related compounds	Rubidium hydroxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Rubidium oxide is the chemical compound with the formula Rb₂O. Rubidium oxide is highly reactive towards water, and therefore it would not be expected to occur naturally. The rubidium content in minerals is often calculated and quoted in terms of Rb₂O. In reality, the rubidium is typically present as a component of (actually, an impurity in) silicate or aluminosilicate. A major source of rubidium is lepidolite, KLi₂Al(Al,Si)₃O₁₀(F,OH)₂, wherein Rb sometimes replaces K.

Rb₂O is a yellow colored solid. The related species Na₂O, K₂O, and Cs₂O are colorless, pale-yellow, and orange, respectively.

The alkali metal oxides M₂O (M = Li, Na, K, Rb) crystallise in the antifluorite structure. In the antifluorite motif, the positions of the anions and cations are reversed relative to their positions in CaF₂, with rubidium ions 4-coordinate (tetrahedral) and oxide ions 8-coordinate (cubic).^[1]