Gold monoiodide

Gold monoiodide is the inorganic compound of gold and iodine with the formula AuI. It can be synthesized by dissolving gold powder in an aqueous solution of iodine and potassium iodide.^[3] With Lewis bases, AuI reacts to give numerous complexes.^[4]

Gold monoiodide

Names
IUPAC name Iodogold
Systematic IUPAC name Gold(I) iodide
Other names Gold monoiodide Aurous iodide
Identifiers
CAS Number	10294-31-2
3D model (JSmol)	Interactive image
ChemSpider	74478 Y
ECHA InfoCard	100.030.584
PubChem CID	82526
UNII	T1UDV7ES1A Y
CompTox Dashboard (EPA)	DTXSID9065027
InChI InChI=1S/Au.HI/h;1H/q+1;/p-1 Y Key: ATGIETUGWDAYPU-UHFFFAOYSA-M Y
SMILES [Au]I
Properties
Chemical formula	AuI
Molar mass	323.871 g/mol
Appearance	Yellowish to greenish-yellow powder
Density	8.25 g/cm3[1]
Magnetic susceptibility (χ)	−91.0·10−6 cm3/mol
Structure
Crystal structure	tetragonal, Pearson symbol tP8, Z = 4
Space group	P42/ncm (No. 138)[1]
Lattice constant	a = 0.435, b = 0.435, c = 1.373 nm
Hazards
GHS labelling:[2]
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P302+P352, P305+P351+P338
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Gold monoiodide can be obtained by reacting a tetrachloridoauric acid solution with furthermore potassium iodide. It is also possible to produce it by reacting gold and iodine in a protective atmosphere at around 390 °C.^[5]

Properties

Gold monoiodide is a yellow, crystalline powder that gradually decomposes upon contact with water, humidity or light. It has a tetragonal crystal structure with the space group P4₂/ncm (space group no. 138), a = 4.359 Å, c = 13.711 Å.^[5]