Rubidium fluoride

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title: "Rubidium fluoride" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["rubidium-compounds", "fluorides", "alkali-metal-fluorides", "rock-salt-crystal-structure"] topic_path: "general/rubidium-compounds" source: "https://en.wikipedia.org/wiki/Rubidium_fluoride" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

| Watchedfields = changed | verifiedrevid = 464384216 | OtherNames = Rubidium(I) Fluoride | ImageFile = Rubidium-fluoride-3D-ionic.png |Section1={{Chembox Identifiers | ChemSpiderID_Ref = | ChemSpiderID = 75311 | InChI = 1/FH.Rb/h1H;/q;+1/p-1 | InChIKey = AHLATJUETSFVIM-REWHXWOFAO | SMILES = [Rb+].[F-] | StdInChI_Ref = | StdInChI = 1S/FH.Rb/h1H;/q;+1/p-1 | StdInChIKey_Ref = | StdInChIKey = AHLATJUETSFVIM-UHFFFAOYSA-M | CASNo = 13446-74-7 | CASNo_Ref = | UNII_Ref = | UNII = 63564TNJ4R | PubChem = 83473 | RTECS = VL8740000 |Section2={{Chembox Properties | Formula = RbF | MolarMass = 104.4662 g/mol | Appearance = white crystalline solid | Density = 3.557 g/cm3 | MeltingPtC = 795 | MeltingPt_notes = | BoilingPtC = 1408 | BoilingPt_notes = | RefractIndex = 1.398 | Solubility = 130.6 g/100 mL (18 °C) | Solubility1 = 0.0036 g/kg (18 °C) 0.0039 g/kg (37 °C) | Solvent1 = acetone | MagSus = −31.9·10−6 cm3/mol | Section3 = {{Chembox Structure | Structure_ref = | CrystalStruct = | SpaceGroup = Fm3m (No. 225) | PointGroup = | LattConst_a = 565 pm | LattConst_b = | LattConst_c = | LattConst_alpha = | LattConst_beta = | LattConst_gamma = | LattConst_ref = | LattConst_Comment = | UnitCellVolume = | UnitCellFormulas = 4 | Section4 = {{Chembox Thermochemistry | Thermochemistry_ref = | HeatCapacity = | Entropy = 113.9 J·mol-1·K-1 | DeltaHform = −552.2 kJ/mol | DeltaGfree = −520.4 kJ/mol | DeltaHcombust = | DeltaHfus = | DeltaHvap = | DeltaHsublim = | HHV = | LHV = |Section7={{Chembox Hazards | NFPA-H = 3 | NFPA-F = 0 | NFPA-R = 0 | ExternalSDS = | MainHazards = Toxic | GHS_ref = | GHSPictograms = | GHSSignalWord = Danger | HPhrases = | PPhrases = | FlashPt = Non-flammable | TLV = 2.5 mg/m3, as F | PEL = 2.5 mg/m3, as F |Section8={{Chembox Related | OtherAnions = Rubidium chloride Rubidium bromide Rubidium iodide Rubidium astatide | OtherCations = Lithium fluoride Sodium fluoride Potassium fluoride Caesium fluoride Francium fluoride 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.

Synthesis

There are several methods for synthesising rubidium fluoride. One involves reacting rubidium hydroxide with hydrofluoric acid: :RbOH + HF → RbF + H2O Another method is to neutralize rubidium carbonate with hydrofluoric acid: :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: :2Rb + F2 → 2RbF

Properties

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

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, which can be produced by reacting rubidium fluoride and hydrogen fluoride.

References

References

  1. (1998). "Taschenbuch für Chemiker und Physiker". Springer.
  2. Aterton Seidell. (1940). "Solubilities Of Organic Compounds Vol - I". D.Van Nostrand Co..
  3. Dickerson, Richard E.. (1988). "Prinzipien der Chemie". Walter de Gruyter.
  4. PubChem. "Rubidium fluoride".
  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".
  6. "WebElements".
  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".
  8. (1905-08-19). "Über die Fluoride des Rubidiums". Zeitschrift für anorganische Chemie.
  9. "A Text-Book of Inorganic Chemistry". Forgotten Books.

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rubidium-compoundsfluoridesalkali-metal-fluoridesrock-salt-crystal-structure