Indium(I) iodide

Indium monoiodide is a binary inorganic compound of indium metal and iodine with the chemical formula InI.^[1][2]

Indium(I) iodide

Names
IUPAC name iodoindium
Other names Indium monoiodide
Identifiers
CAS Number	13966-94-4 Y
3D model (JSmol)	Interactive image
ChemSpider	21241509
ECHA InfoCard	100.034.301
EC Number	237-746-3
PubChem CID	6336605
CompTox Dashboard (EPA)	DTXSID201014406
InChI InChI=1S/HI.In/h1H;/q;+1/p-1 Key: FOVZCYAIUZHXGB-UHFFFAOYSA-M
SMILES [In]I
Properties
Chemical formula	IIn
Molar mass	241.722 g·mol−1
Appearance	red-brown solid
Density	5.32 g/cm3
Melting point	365 °C (689 °F; 638 K)
Solubility in water	insoluble
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H315, H319, H334, H335
Precautionary statements	P301, P302, P305, P312, P330, P338, P351, P352
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Indium(I) iodide can be obtained by reacting indium with iodine or indium(III) iodide in vacuum at 300 °C to 400 °C or with mercury(II) iodide at 350 °C.^[3]

2In + I₂ → 2InI^[4]

2In + InI₃ → 3InI

2In + HgI₂ → 2InI + Hg

Physical properties

Indium(I) iodide forms a brown-red diamagnetic solid. Its melt is black. The compound has an orthorhombic crystal structure in the space group Cmcm (space group no. 63) with the lattice parameters a = 475 pm, b = 1276 pm, c = 491 pm.^[5]

Chemical properties

Decomposes slowly with hot water:

2InI + H₂O → InOH + HI

Reacts with water in the presence of oxygen:^[6]

2InI + O + 3H₂O → 2In(OH)₂ + 2HI