Bismuth(III) iodide

Bismuth(III) iodide
Names
	IUPAC name Bismuth(III) iodide
	Other names Bismuth iodide, bismuth triiodide
Identifiers
CAS Number	7787-64-6 ;
3D model (JSmol)	Interactive image;
ChemSpider	21172753;
ECHA InfoCard	100.029.207
EC Number	232-127-4;
PubChem CID	111042;
UNII	BGX9X3FOLL ;
CompTox Dashboard (EPA)	DTXSID3064853 ;
	InChI InChI=1/Bi.3HI.3H/h;31H;;;/q+3;;;;;;/p-3/rBiH3.3HI/h1H3;31H/q+3;;;/p-3 Key: HXTWPIJUKIDKIH-ZPTXHWADAA;
	SMILES [I-].[I-].[I-].[BiH3+3];
Properties
Chemical formula	BiI3
Molar mass	589.69 g/mol
Appearance	Greenish-black crystals
Density	5.778 g/cm3
Melting point	408.6 °C (767.5 °F; 681.8 K)
Boiling point	542 °C (1,008 °F; 815 K)
Solubility in water	0.7761 mg/100 mL (20 °C)
Solubility product (Ksp)	7.71×10−19
Solubility	50 g/100 mL ethanol; 50 g/100 mL 2 M hydrochloric acid
Magnetic susceptibility (χ)	−200.5·10−6 cm3/mol
Structure
Crystal structure	Trigonal, hR24
Space group	R-3, No. 148
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501
NFPA 704 (fire diamond)	2 0 1
Related compounds
Other anions	Bismuth(III) fluoride; Bismuth(III) chloride; Bismuth(III) bromide
Other cations	Nitrogen triiodide; Phosphorus triiodide; Antimony triiodide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Bismuth(III) iodide is the inorganic compound with the formula Bi I₃. This gray-black salt is the product of the reaction of bismuth and iodine, which once was of interest in qualitative inorganic analysis.

Bismuth(III) iodide adopts a distinctive crystal structure, with iodide centres occupying a hexagonally closest-packed lattice, and bismuth centres occupying either none or two-thirds of the octahedral holes (alternating by layer), therefore it is said to occupy one third of the total octahedral holes.