Rubidium bromide

{{chembox

| verifiedrevid = 447546883

| ImageFile = Rubidium-bromide-3D-ionic.png

| ImageName = Rubidium bromide

| IUPACName = Rubidium bromide

| OtherNames = Rubidium(I) bromide

|Section1={{Chembox Identifiers

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChemSpiderID = 74217

| InChI = 1/BrH.Rb/h1H;/q;+1/p-1

| InChIKey = JAAGVIUFBAHDMA-REWHXWOFAB

| SMILES = [Rb+].[Br-]

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/BrH.Rb/h1H;/q;+1/p-1

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = JAAGVIUFBAHDMA-UHFFFAOYSA-M

| CASNo = 7789-39-1

| CASNo_Ref = {{cascite|correct|CAS}}

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = 33CM31XVQQ

| PubChem = 4670918

}}

|Section2={{Chembox Properties

| Formula = RbBr

| MolarMass = 165.372 g/mol

| Appearance = white crystalline solid

| Density = 3.350 g/cm³

| MeltingPtC = 693

| BoilingPtC = 1340

| Solubility = 98 g/100 mL

| MagSus = −56.4·10⁻⁶ cm³/mol

}}

|Section3={{Chembox Hazards

| ExternalSDS =

| HPhrases =

| PPhrases =

| GHS_ref =

| FlashPt = Non-flammable

}}

|Section8={{Chembox Related

| OtherAnions = Rubidium fluoride
Rubidium chloride
Rubidium iodide
Rubidium astatide

| OtherCations = Lithium bromide
Sodium bromide
Potassium bromide
Caesium bromide
Francium bromide

}}

}}

Rubidium bromide is an inorganic compound with the chemical formula {{chem2|RbBr|auto=1}}. It is a salt of hydrogen bromide. It consists of bromide anions {{chem2|Br−}} and rubidium cations {{chem2|Rb+}}. It has a NaCl crystal structure, with a lattice constant of 685 picometres.{{cite journal|journal= Phys. Rev. B|volume=39|issue=17|pages=12838–12844 |year=1989|author1=G. Chern |author2=J. G. Skofronick |author3=W. P. Brug |author4=S. A. Safron |doi=10.1103/PhysRevB.39.12838|title=Surface phonon modes of the RbBr(001) crystal surface by inelastic He-atom scattering|pmid=9948158|bibcode=1989PhRvB..3912838C }}

There are several methods for synthesising rubidium bromide. One involves reacting rubidium hydroxide with hydrobromic acid:

:RbOH + HBr → RbBr + H₂O

Another method is to neutralize rubidium carbonate with hydrobromic acid:

:Rb₂CO₃ + 2 HBr → 2 RbBr + H₂O + CO₂

Rubidium metal would react directly with bromine to form RbBr, but this is not a sensible production method, since rubidium metal is substantially more expensive than the carbonate or hydroxide; moreover, the reaction would be explosive.