Chemistry:Rhenium(III) iodide

Rhenium(III) iodide
Names
	Other names Rhenium(III) iodide, triiodorhenium
Identifiers
CAS Number	15622-42-1;
3D model (JSmol)	Interactive image;
ChemSpider	21170009;
EC Number	239-698-9;
PubChem CID	12984320;
CompTox Dashboard (EPA)	DTXSID60275813;
	InChI InChI=1S/3HI.Re/h3*1H;/q;;;+3/p-3 Key: DDMQJDMHHOTHKW-UHFFFAOYSA-K;
	SMILES I[Re](I)I;
Properties
Chemical formula	I3Re
Molar mass	566.920 g·mol−1
Appearance	violet-black crystals
Density	6.37 g/cm3
Melting point	800 °C (1,470 °F; 1,070 K)
Solubility in water	poorly soluble
Structure
Crystal structure	monoclinic
Related compounds
Related compounds	Iridium triiodide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Rhenium(III) iodide is a binary chemical compound of rhenium and iodide with the chemical formula ReI₃.^[1]^[2]

Synthesis

Rhenium(III) iodide can be synthesized by the decomposition of rhenium(IV) iodide:^[3]^[4]

2ReI
4 → 2ReI
3 + I
2

Another way to make it is by introduction of ethanol into a mixture of perrhenic acid and hydroiodic acid.

HReO
4 + 3HI + 2C
2H
5OH → ReI
3 + 4H
2O + 2CH
3CHO

Rhenium(III) iodide forms violet-black crystals. It is poorly soluble in water, acetone, ethanol, ether, and dilute acid solutions.

When heated in vacuum up to 170 °C, the compound decomposes to rhenium(II) iodide, and at 380 °C — to rhenium(I) iodide:

2ReI
3 → 2ReI
2 + I
2

ReI
3 → ReI + I
2

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