rubidium iodide

Rubidium iodide can be synthesized in several ways. One is to use a mixed reaction of rubidium hydroxide and hydriodic acid/hydrogen iodide:{{cite web | url = http://www.webelements.com/webelements/compounds/text/Rb/F1Rb1-13446747.html | title = WebElements | accessdate = 23 February 2006 | archive-date = 2008-04-18 | archive-url = https://web.archive.org/web/20080418211628/http://www.webelements.com/webelements/compounds/text/Rb/F1Rb1-13446747.html | url-status=live }}

:{{chem2|RbOH + HI → RbI + H2O}}

Another method is to neutralize rubidium carbonate with hydriodic acid:

:{{chem2|Rb2CO3 + 2HI → 2RbI + H2O + CO2}}

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:

:{{chem2|2Rb + I2 → 2RbI}}

Rubidium iodide forms colorless crystals, and has a red-violet flame color. The refractive index of the crystals is n_D = 1.6474.{{Cite book |last=Ans |first=Jan d' |title=Elemente, anorganische Verbindungen und Materialien |last2=Ans |first2=Jan d' |date=1998 |publisher=Publisher not known |isbn=978-3-540-60035-0 |edition=4., neubearb. u. rev. Aufl |series=Taschenbuch für Chemiker und Physiker / D'Ans |location=Location not known}} It reacts with halogens to form polyhalides: RbI₃, RbICl₂, RbICl₄. It is easily soluble in water, liquid ammonia, sulfuric acid, RbI·6NH₃ and RbI·3SO₂. Rubidium iodide is soluble only in the following solvents:

The standard enthalpy of formation of rubidium iodide is Δ_fH⁰₂₉₈ = −328.7 kJ mol⁻¹,{{Cite book |title=Prinzipien der Chemie |date=1988 |publisher=de Gruyter |isbn=978-3-11-009969-0 |editor-last=Dickerson |editor-first=Richard E. |edition=2., bearb. und erw. Aufl |location=Berlin |editor-last2=Sichting |editor-first2=Hans-Werner}} the standard free enthalpy of formation ΔG⁰₂₉₈ = −325.7 kJ mol⁻¹, and the standard molar entropy S⁰₂₉₈ = 118.11 J K⁻¹·mol⁻¹.

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.『{{lang|ja|化学大辞典}}』　共立出版、1993年

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).Jurja, Sanda, et al. "Correlation between effectiveness and antioxidant activity of some anti cataract eye drops." Rev Chim (Bucharest) 67 (2016): 1004-1007. Another product is Polijodurato^®. However, there are studies that show that rubidium iodide has allergy-triggering{{Cite web |title=Allergen Rubidium Allergie enthalten Allergologie |url=http://www.alles-zur-allergologie.de/Allergologie/Artikel/4251/Rubidium/enthalten.html |access-date=2023-09-16 |website=www.alles-zur-allergologie.de}} and inflammation-causing{{Cite journal |last=Cameli |first=N. |last2=Bardazzi |first2=F. |last3=Morelli |first3=R. |last4=Tosti |first4=A. |date=Nov 1990 |title=Contact dermatitis from rubidium iodide in eyedrops |url=https://onlinelibrary.wiley.com/doi/10.1111/j.1600-0536.1990.tb05182.x |journal=Contact Dermatitis |language=en |volume=23 |issue=5 |pages=377–378 |doi=10.1111/j.1600-0536.1990.tb05182.x|url-access=subscription }} 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.{{Cite journal |last=Paschalis |first=C. |last2=Jenner |first2=F. A. |last3=Lee |first3=C. R. |date=May 1978 |title=Effects of rubidium chloride on the course of manic-depressive illness |url=https://pubmed.ncbi.nlm.nih.gov/349155/?dopt=Abstract |journal=Journal of the Royal Society of Medicine |volume=71 |issue=5 |pages=343–352 |doi=10.1177/014107687807100507 |issn=0141-0768 |pmc=1436619 |pmid=349155}}

It found isolated use in organic synthesis, for example for the targeted saponification of a polymethylated phosphate.{{Cite journal |last=Turhanen |first=Petri A. |date=2014-07-03 |title=Synthesis of Triple-Bond-Containing 1-Hydroxy-1,1-bisphosphonic Acid Derivatives To Be Used as Precursors in "Click" Chemistry: Two Examples |url=https://pubs.acs.org/doi/10.1021/jo500831r |journal=The Journal of Organic Chemistry |language=en |volume=79 |issue=13 |pages=6330–6335 |doi=10.1021/jo500831r |issn=0022-3263|url-access=subscription }}

{{reflist}}

• CRC Handbook of Chemistry and Physics, 77th edition

{{Rubidium compounds}}

{{Iodides}}

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Category:Rubidium compounds

Category:Iodides

Category:Metal halides

Category:Alkali metal iodides

Category:Rock salt crystal structure