Rubidium fluoride

Rubidium fluoride
	source ↗
Names
	Other names Rubidium(I) Fluoride
Identifiers
CAS Number	13446-74-7 Y;
3D model (JSmol)	Interactive image;
ChemSpider	75311 Y;
ECHA InfoCard	100.033.262
PubChem CID	83473;
RTECS number	VL8740000;
UNII	63564TNJ4R Y;
CompTox Dashboard (EPA)	DTXSID7065463 ;
	InChI InChI=1S/FH.Rb/h1H;/q;+1/p-1 Y Key: AHLATJUETSFVIM-UHFFFAOYSA-M Y; InChI=1/FH.Rb/h1H;/q;+1/p-1 Key: AHLATJUETSFVIM-REWHXWOFAO;
	SMILES [Rb+].[F-];
Properties
Chemical formula	RbF
Molar mass	104.4662 g/mol
Appearance	white crystalline solid
Density	3.557 g/cm3
Melting point	795 °C (1,463 °F; 1,068 K)
Boiling point	1,408 °C (2,566 °F; 1,681 K)
Solubility in water	130.6 g/100 mL (18 °C)
Solubility in acetone	0.0036 g/kg (18 °C); 0.0039 g/kg (37 °C)
Magnetic susceptibility (χ)	−31.9·10−6 cm3/mol
Refractive index (nD)	1.398
Structure
Space group	Fm3m (No. 225)
Lattice constant	a = 565 pm
Formula units (Z)	4
Thermochemistry
Std molar; entropy (S⦵298)	113.9 J·mol−1·K−1
Std enthalpy of; formation (ΔfH⦵298)	−552.2 kJ/mol
Gibbs free energy (ΔfG⦵)	−520.4 kJ/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Toxic
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H302, H311, H312, H315, H319, H331, H332, H335, H351
Precautionary statements	P203, P261, P262, P264, P264+P265, P270, P271, P280, P301+P316, P301+P317, P302+P352, P304+P340, P305+P351+P338, P316, P317, P318, P319, P321, P330, P332+P317, P337+P317, P361+P364, P362+P364, P403+P233, P405, P501
NFPA 704 (fire diamond)	source ↗ 3 0 0
Flash point	Non-flammable
Threshold limit value (TLV)	2.5 mg/m3, as F
	NIOSH (US health exposure limits):
PEL (Permissible)	2.5 mg/m3, as F
Related compounds
Other anions	Rubidium chloride; Rubidium bromide; Rubidium iodide; Rubidium astatide
Other cations	Lithium fluoride; Sodium fluoride; Potassium fluoride; Caesium fluoride; Francium fluoride
	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 fluoride (RbF) is the fluoride salt of rubidium. It is a white crystalline solid with a cubic crystal structure, similar to common salt. It forms two different hydrates, a sesquihydrate with the stoichiometric composition 2RbF·3H₂O and a third hydrate with the composition 3RbF·H₂O.⁵

Synthesis

There are several methods for synthesising rubidium fluoride. One involves reacting rubidium hydroxide with hydrofluoric acid:⁶

RbOH + HF → RbF + H₂O

Another method is to neutralize rubidium carbonate with hydrofluoric acid:⁶

Rb₂CO₃ + 2HF → 2RbF + H₂O + CO₂

Another possible method is to react rubidium hydroxide with ammonium fluoride:

RbOH + NH₄F → RbF + H₂O + NH₃

The least used method due to expense of rubidium metal is to react it directly with fluorine gas, as rubidium reacts violently with halogens:⁶

2Rb + F₂ → 2RbF

Properties

The enthalpy of solution of rubidium fluoride was determined to be −24.28 kJ/mol.⁷

Rubidium fluoride has a purple or magenta red flame test.

Related compounds

In addition to simple rubidium fluoride, an acidic rubidium fluoride with the molecular formula HRbF₂ is also known,⁸ which can be produced by reacting rubidium fluoride and hydrogen fluoride.⁸ The compounds H₂RbF₃ and H₃RbF₄ were also synthesized.⁹⁸

References

Aterton Seidell (1940). Solubilities Of Organic Compounds Vol - I. Carnegie-Mellon University Hunt Library, N.Sathyanarayanan. D.Van Nostrand Co.
Ans, Jean d'; Lax, Ellen (1998). Taschenbuch für Chemiker und Physiker (in German). Springer. ISBN 978-3-540-60035-0.
Dickerson, Richard E. (1988). Prinzipien der Chemie (in German). Walter de Gruyter. ISBN 978-3-11-009969-0.
PubChem. "Rubidium fluoride". pubchem.ncbi.nlm.nih.gov. Retrieved 2026-01-19.
texte, Académie des sciences (France) Auteur du (1911-01-01). "Comptes rendus hebdomadaires des séances de l'Académie des sciences / publiés... par MM. les secrétaires perpétuels". Gallica. Retrieved 2023-12-24.
"WebElements". Archived from the original on 2008-04-18. Retrieved 23 February 2006.
texte, Académie des sciences (France) Auteur du (1911-01-01). "Comptes rendus hebdomadaires des séances de l'Académie des sciences / publiés... par MM. les secrétaires perpétuels". Gallica. Retrieved 2023-12-24.
Eggeling, Hans; Meyer, Jullius (1905-08-19). "Über die Fluoride des Rubidiums". Zeitschrift für anorganische Chemie. 46 (1): 174–176. doi:10.1002/zaac.19050460111. ISSN 0863-1778.
A Text-Book of Inorganic Chemistry. Forgotten Books. ISBN 978-1-4510-0469-4.

[solubilities-1] Aterton Seidell (1940). Solubilities Of Organic Compounds Vol - I. Carnegie-Mellon University Hunt Library, N.Sathyanarayanan. D.Van Nostrand Co.

[Ans-2] Ans, Jean d'; Lax, Ellen (1998). Taschenbuch für Chemiker und Physiker (in German). Springer. ISBN 978-3-540-60035-0.

[Dickerson-3] Dickerson, Richard E. (1988). Prinzipien der Chemie (in German). Walter de Gruyter. ISBN 978-3-11-009969-0.

[4] PubChem. "Rubidium fluoride". pubchem.ncbi.nlm.nih.gov. Retrieved 2026-01-19.

[5] texte, Académie des sciences (France) Auteur du (1911-01-01). "Comptes rendus hebdomadaires des séances de l'Académie des sciences / publiés... par MM. les secrétaires perpétuels". Gallica. Retrieved 2023-12-24.

[www.webelements.com-6] "WebElements". Archived from the original on 2008-04-18. Retrieved 23 February 2006.

[7] texte, Académie des sciences (France) Auteur du (1911-01-01). "Comptes rendus hebdomadaires des séances de l'Académie des sciences / publiés... par MM. les secrétaires perpétuels". Gallica. Retrieved 2023-12-24.

[Eggeling-8] Eggeling, Hans; Meyer, Jullius (1905-08-19). "Über die Fluoride des Rubidiums". Zeitschrift für anorganische Chemie. 46 (1): 174–176. doi:10.1002/zaac.19050460111. ISSN 0863-1778.

[9] A Text-Book of Inorganic Chemistry. Forgotten Books. ISBN 978-1-4510-0469-4.

1

2

3

4

5

6

7

8

9