Rhodium(III) bromide

Rhodium(III) bromide refers to inorganic compounds of the formula RhBr₃(H₂O)_n where n = 0 or approximately three. Both forms are brown solids. The hydrate is soluble in water and lower alcohols. It is used to prepare rhodium bromide complexes.^[2] Rhodium bromides are similar to the chlorides, but have attracted little academic or commercial attention.

Rhodium(III) bromide

Names
Other names Rhodium tribromide
Identifiers
CAS Number	15608-29-4 N
3D model (JSmol)	Interactive image
ChemSpider	76689
ECHA InfoCard	100.036.064
EC Number	239-687-9
PubChem CID	85020
CompTox Dashboard (EPA)	DTXSID40935367
InChI InChI=1S/3BrH.Rh/h3*1H;/q;;;+3/p-3 Key: MMRXYMKDBFSWJR-UHFFFAOYSA-K
SMILES [Br-].[Br-].[Br-].[Rh+3]
Properties
Chemical formula	RhBr3
Molar mass	342 g/mol
Appearance	red-brown solid[1]
Solubility in water	soluble in water, methanol, ethanol
Related compounds
Other anions	Rhodium(III) fluoride, Rhodium(III) chloride, Rhodium(III) iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Structure

Rhodium(III) bromide adopts the aluminium chloride crystal structure.^[3][4]

Reactions

Rhodium(III) bromide is a starting material for the synthesis of other rhodium halides. For example, it reacts with bromine trifluoride to form rhodium(IV) fluoride and with aqueous potassium iodide to form rhodium(III) iodide. Like most other rhodium trihalides, anhydrous RhBr₃ is insoluble in water.^[1] The dihydrate RhBr₃·2H₂O forms when rhodium metal reacts with hydrochloric acid and bromine.^[1]