Potassium hexabromorhenate

Potassium hexabromorhenate is an inorganic chemical compound with the chemical formula K₂ReBr₆.^[1][2]

Potassium hexabromorhenate

Names
IUPAC name dipotassium; hexabromo rhenium(2-)
Other names Potassium hexabromorhenate(IV)
Identifiers
CAS Number	16903-70-1
3D model (JSmol)	Interactive image
ChemSpider	4907648
PubChem CID	71310035
InChI InChI=1S/6BrH.2K.Re/h6*1H;;;/q;;;;;;2*+1;+4/p-6 Key: KJFJGUZKEHEZCT-UHFFFAOYSA-H
SMILES [K+].[K+].Br[Re-2](Br)(Br)(Br)(Br)Br
Properties
Chemical formula	Br6K2Re
Molar mass	743.828 g·mol−1
Appearance	dark red crystals
Density	4.34 g/cm3
Solubility in water	reacts with water
Hazards
GHS labelling:
Signal word	Warning
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Fusion of rhenium with potassium bromide in a bromine vapor current:

Re + 2KBr + 2Br₂ → K₂ReBr₆

The effect of hydrobromic acid on a mixture of potassium bromide with rhenium(VI) oxide:^[3]

ReO₂ + 2KBr + 4HBr → K₂ReBr₆ + 2H₂O

Reduction of potassium perrenate by potassium iodide in concentrated hydrobromic acid:^[3]

2KReO₄ + 6KI + 16HBr → 2K₂ReBr₆ + 4KBr + 3I₂ + 8H₂O

Chemical properties

Potassium hexabromorhenate dissolves in hydrobromic acid to create a red or deep yellow solution.^[4]

Reacts with water.

K₂ReBr₆ + 2H₂O → ReO₂ + 2KBr + 4HBr

Physical properties

The compound forms dark red crystals of cubic system, space group Fm3m.^[5]