Bismuth(III) iodide

Bismuth(III) iodide is the inorganic compound with the formula BiI3. 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
Names
IUPAC name
Bismuth(III) iodide
Other names
Bismuth iodide, bismuth triiodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.207
EC Number
  • 232-127-4
PubChem CID
UNII
  • InChI=1/Bi.3HI.3H/h;3*1H;;;/q+3;;;;;;/p-3/rBiH3.3HI/h1H3;3*1H/q+3;;;/p-3
    Key: HXTWPIJUKIDKIH-ZPTXHWADAA
SMILES
  • [I-].[I-].[I-].[BiH3+3]
Properties
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)
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
Trigonal, hR24
Space group
 R-3, No. 148
Hazards
GHS labelling:
Danger
H314
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 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.

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