Iridium(III) iodide

Iridium(III) iodide is an iodide of iridium, with the chemical formula of IrI₃.

Iridium(III) iodide

Names
Other names Iridium triiodide
Identifiers
CAS Number	7790-41-2
3D model (JSmol)	Interactive image dihydrate: Interactive image trihydrate: Interactive image
ChemSpider	9226575
PubChem CID	18534463
CompTox Dashboard (EPA)	DTXSID00453279
InChI InChI=1S/3HI.Ir/h3*1H;/q;;;+3/p-3 Key: WUHYYTYYHCHUID-UHFFFAOYSA-K
SMILES [I-].[I-].[I-].[Ir+3] dihydrate: O.O.[I-].[I-].[I-].[Ir+3] trihydrate: O.O.O.[I-].[I-].[I-].[Ir+3]
Properties
Chemical formula	I3Ir
Molar mass	572.930 g·mol−1
Appearance	dark brown solid[1]
Density	7.4 g·cm−3[1]
Solubility	insoluble in water and benzene[1]
Related compounds
Other anions	iridium(III) hydroxide iridium(III) chloride Iridium(III) bromide
Other cations	Rhodium(III) iodide
Related compounds	Iridium(IV) iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Iridium(III) iodide can be obtained by reducing iridium(IV) iodide with hydrogen at 210 °C.^[2] It can also be formed by the reaction of iridium dioxide^[3] or iridium(III) hydroxide with hydrogen iodide.^[4]

Chemical properties

Iridium(III) iodide is a dark brown solid that is insoluble in water.^[1] It is monoclinic like chromium trichloride.^[5][6] Its trihydrate is yellow and can be dehydrated into the dihydrate or anhydrous form on heating. Iridium(III) iodide also has a monohydrate.^[3][7]