Potassium hexaiodorhenate

Names
IUPAC name dipotassium; hexaiodo rhenium(2-)
Other names Potassium hexaiodorhenate(IV), dipotassium hexaiodorhenate
Identifiers
CAS Number	19710-22-6
3D model (JSmol)	Interactive image
ChemSpider	17344846
EC Number	621-412-2
PubChem CID	16217292
CompTox Dashboard (EPA)	DTXSID70584322
InChI InChI=1S/6HI.2K.Re/h6*1H;;;/q;;;;;;2*+1;+4/p-6 Key: DFWHBRZEYYLAED-UHFFFAOYSA-H
SMILES [K+].[K+].I[Re--](I)(I)(I)(I)I
Properties
Chemical formula	I6K2Re
Molar mass	1025.830 g·mol−1
Appearance	black crystals
Density	g/cm3
Solubility in water	reacts with water
Hazards
GHS labelling:[1]
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P260, P264, P280, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P321, P363, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Potassium hexaiodorhenate is an inorganic chemical compound with the chemical formula K₂ReI₆.^[2][3]

The compound can be prepared by reduction of potassium perrhenate by potassium iodide in concentrated hydrochloric acid:^[4]

2KReO₄ + 2KI + 16HI → 2KReI₆ + 3I₂ + 8H₂O

The compound forms black crystals, soluble in warm HI,^{[clarification needed]} methanol, and acetone.^[5]

Potassium hexaiodorhenate is hydrolyzed in aqueous solutions.

K₂ReI₆ + 2H₂O → ReO₂ + 2KI + 4HI

It decomposes when heated:

K₂ReI₆ → Re + 2KI + 2I₂

It reacts with strong acids:

K₂ReI₆ + H₂SO₄ → HReI₅ + HI + K₂SO₄