Rubidium iodide
title: "Rubidium iodide" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["rubidium-compounds", "iodides", "metal-halides", "alkali-metal-iodides", "rock-salt-crystal-structure"] topic_path: "general/rubidium-compounds" source: "https://en.wikipedia.org/wiki/Rubidium_iodide" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
| Watchedfields = changed | verifiedrevid = 447545683 | ImageFile = Rubidium-iodide-3D-ionic.png | ImageSize = | ImageName = Rubidium iodide | ImageFile2 = Jodid rubidný.jpg | IUPACName = Rubidium iodide | OtherNames = | Section1 = {{Chembox Identifiers | ChemSpiderID_Ref = | ChemSpiderID = 74226 | InChI = 1/HI.Rb/h1H;/q;+1/p-1 | InChIKey = WFUBYPSJBBQSOU-REWHXWOFAR | SMILES = [Rb+].[I-] | StdInChI_Ref = | StdInChI = 1S/HI.Rb/h1H;/q;+1/p-1 | StdInChIKey_Ref = | StdInChIKey = WFUBYPSJBBQSOU-UHFFFAOYSA-M | CASNo_Ref = | CASNo = 7790-29-6 | UNII_Ref = | UNII = 18CYW0VL2X | PubChem = 3423208 | RTECS = VL8925000 | Section2 = {{Chembox Properties | Formula = RbI | Appearance = white solid | MolarMass = 212.3723 g/mol | Density = 3.110 g/cm 3 | MeltingPtC = 646.85 | BoilingPtC = 1304 | Solubility = 152 g/100 mL | MagSus = −72.2·10−6 cm3/mol | RefractIndex = 1.6474 | Section3 = {{Chembox Hazards | ExternalSDS = External MSDS | FlashPt = | AutoignitionPt = | LD50 = 4708 mg/kg (oral, rat) | Section4 = {{Chembox Thermochemistry | Thermochemistry_ref = | HeatCapacity = | Entropy = 118.11 J·K−1·mol−1 | DeltaHform = −328.7 kJ·mol−1 | DeltaGfree = −325.7 kJ·mol−1 | DeltaHcombust = | DeltaHfus = | DeltaHvap = | DeltaHsublim = | HHV = | LHV = | Section8 = {{Chembox Related | OtherAnions = Rubidium fluoride Rubidium chloride Rubidium bromide Rubidium astatide | OtherCations = Lithium iodide Sodium iodide Potassium iodide Caesium iodide Francium iodide | OtherCompounds = Rubidium iodide, more specifically rubidium monoiodide, is a salt of rubidium and iodine, with the chemical formula RbI. It is a white solid with a melting point of 646.85 °C.
Properties
Rubidium iodide forms colorless crystals, and has a red-violet flame color.
It is easily soluble in water, liquid ammonia, sulfuric acid, RbI·6NH3 and RbI·3SO2. Rubidium iodide is soluble only in the following solvents:
::data[format=table title="Solubility of RbI in organic solvents{{Cite book |last=Aterton Seidell |url=http://archive.org/details/solubilitiesofor023311mbp |title=Solubilities Of Organic Compounds Vol - I |date=1940 |publisher=D.Van Nostrand Co. |others=Carnegie-Mellon University Hunt Library, N.Sathyanarayanan}}
(given in g RbI in 100 cm3 saturated solution)"]
| Solvent | 0 °C | 25 °C |
|---|---|---|
| Acetonitrile | 1.478 | 1.350 |
| Propionitrile | 0.274 | 0.305 |
| Nitromethane | 0.567 | 0.518 |
| Acetone | 0.960 | 0.674 |
| Furfural | 4,930 | |
| :: |
Structure
Rubidium iodide has a sodium chloride structure; its lattice constant is a = 7.326 Å, and the Rb–I bond length is 3.66 Å.
Preparation
Rubidium iodide can be synthesized in several ways. One is to use a mixed reaction of rubidium hydroxide and hydriodic acid/hydrogen iodide:
:
Another method is to neutralize rubidium carbonate with hydriodic acid:
:
Another method is to use rubidium metal to react directly with iodine, but because rubidium metal is very expensive, it is the least commonly used method. In addition, rubidium reacts violently with halogens and burns:
:
Applications
Rubidium iodide is used as a component of eye drops, in which it is sold in Romania under the name Rubjovit (containing 8 mg/ml RbI). Another product is Polijodurato. However, there are studies that show that rubidium iodide has allergy-triggering and inflammation-causing side effects. Homeopathic products containing rubidium iodide are available under the name Rubidium iodatum. In the past, towards the end of the 19th century, it was used to treat syphilis.
Rubidium iodide has isolated uses in organic synthesis, for example for the targeted saponification of a polymethylated phosphate.
Reactions
Rubidium iodide reacts with halogens to form polyhalides: RbI3, RbICl2, RbICl4.
References
Bibliography
- CRC Handbook of Chemistry and Physics, 77th edition
References
- (1998). "Elemente, anorganische Verbindungen und Materialien". Publisher not known.
- (1988). "Prinzipien der Chemie". de Gruyter.
- Aterton Seidell. (1940). "Solubilities Of Organic Compounds Vol - I". D.Van Nostrand Co..
- 『{{lang. ja. 化学大辞典』 共立出版、1993年
- "WebElements".
- Jurja, Sanda, et al. "Correlation between effectiveness and antioxidant activity of some anti cataract eye drops." ''Rev Chim (Bucharest)'' 67 (2016): 1004-1007.
- "Allergen Rubidium Allergie enthalten Allergologie".
- (Nov 1990). "Contact dermatitis from rubidium iodide in eyedrops". Contact Dermatitis.
- (May 1978). "Effects of rubidium chloride on the course of manic-depressive illness". Journal of the Royal Society of Medicine.
- Turhanen, Petri A.. (2014-07-03). "Synthesis of Triple-Bond-Containing 1-Hydroxy-1,1-bisphosphonic Acid Derivatives To Be Used as Precursors in "Click" Chemistry: Two Examples". The Journal of Organic Chemistry.
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