Copper(I) iodide

Copper(I) iodide
Names
	IUPAC name Copper(I) iodide
	Other names Cuprous iodide, marshite
Identifiers
CAS Number	7681-65-4 ;
3D model (JSmol)	Interactive image;
ChemSpider	22766 ;
ECHA InfoCard	100.028.795
PubChem CID	24350;
UNII	7DE9CA6IL2 ;
CompTox Dashboard (EPA)	DTXSID5041803 ;
	InChI InChI=1S/Cu.HI/h;1H/q+1;/p-1 Key: LSXDOTMGLUJQCM-UHFFFAOYSA-M ; InChI=1/Cu.HI/h;1H/q+1;/p-1 Key: LSXDOTMGLUJQCM-REWHXWOFAV;
	SMILES [Cu]I;
Properties
Chemical formula	CuI
Molar mass	190.45 g/mol
Appearance	White solid
Odor	odorless
Density	5.67 g/cm3
Melting point	606 °C (1,123 °F; 879 K)
Boiling point	1,290 °C (2,350 °F; 1,560 K) (decomposes)
Solubility in water	0.000042 g/100 mL
Solubility product (Ksp)	1.27 x 10−12
Solubility	soluble in ammonia and iodide solutions ; insoluble in dilute acids
Vapor pressure	10 mm Hg (656 °C)
Magnetic susceptibility (χ)	-63.0·10−6 cm3/mol
Refractive index (nD)	2.346
Structure
Crystal structure	zincblende
Coordination geometry	Tetrahedral anions and cations
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H315, H319, H335, H410
Precautionary statements	P261, P273, P305+P351+P338, P501
NFPA 704 (fire diamond)	1 1 0
Flash point	Non-flammable
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m3 (as Cu)
REL (Recommended)	TWA 1 mg/m3 (as Cu)
IDLH (Immediate danger)	TWA 100 mg/m3 (as Cu)
Safety data sheet (SDS)	Sigma Aldrich
Related compounds
Other anions	Copper(I) fluoride; Copper(I) chloride; Copper(I) bromide;
Other cations	silver iodide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Copper(I) iodide is the inorganic compound with the formula CuI. It is also known as cuprous iodide. It is useful in a variety of applications ranging from organic synthesis to cloud seeding.

Copper(I) iodide is white, but samples often appear tan or even, when found in nature as rare mineral marshite, reddish brown, but such color is due to the presence of impurities. It is common for samples of iodide-containing compounds to become discolored due to the facile aerobic oxidation of the iodide anion to molecular iodine.

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