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.[2][3]

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
UNII
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)[1]
0.7761 mg/100 mL (20 °C)
Solubility 50 g/100 mL ethanol
50 g/100 mL 2 M hydrochloric acid
−200.5·10−6 cm3/mol
Structure
Trigonal, hR24
R-3, No. 148
Hazards
GHS pictograms
GHS Signal word Danger
H314
P260, P264, P280, P301+330+331, P303+361+353, P304+340, P305+351+338, P310, P321, P363, P405, P501
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformReactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
0
2
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.[4][5]

Synthesis

Bismuth(III) iodide forms upon heating an intimate mixture of iodine and bismuth powder:[6][7]

2Bi + 3I2 → 2BiI3

BiI3 can also be made by the reaction of bismuth oxide with aqueous hydroiodic acid:[8]

Bi2O3(s) + 6HI(aq) → 2BiI3(s) + 3H2O(l)

Reactions

Since bismuth(III) iodide is insoluble in water, an aqueous solution can be tested for the presence of Bi3+ ions by adding a source of iodide such as potassium iodide. A black precipitate of bismuth(III) iodide indicates a positive test.[9]

Bismuth(III) iodide forms iodobismuth(III) anions when heated with halide donors:[10]

2 NaI + BiI3 → Na2[BiI5]

Bismuth(III) iodide catalyzes the Mukaiyama aldol reaction. Bi(III) is also used in a Barbier type allylation of carbonyl compounds in combination with a reducing agent such as zinc or magnesium.

References
  1. Norman, Nicholas C. (1998), Chemistry of Arsenic, Antimony and Bismuth, Springer, p. 95, ISBN 0-7514-0389-X, retrieved 2008-06-03
  2. "Bismuth iodide", McGraw-Hill Dictionary of Scientific and Technical Terms, McGraw-Hill, 2003, retrieved 2008-06-19
  3. Turner, Jr., Francis M.; Berolzheimer, Daniel D.; Cutter, William P.; Helfrich, John (1920), The Condensed Chemical Dictionary, New York: Chemical Catalog Company, p. 107, retrieved 2008-06-19
  4. Smart, Lesley; Moore, Elaine A. (2005), Solid State Chemistry: An Introduction, CRC Press, p. 40, ISBN 0-7487-7516-1, retrieved 2008-06-19
  5. Mackay, Rosemary Ann; Henderson, W. (2002), Introduction to Modern Inorganic Chemistry, CRC Press, pp. 122–6, ISBN 0-7487-6420-8, retrieved 2008-06-19
  6. Watt, George W.; Hakki, Wafai W.; Choppin, Gregory R. (1953). "Bismuth(III) Iodide (Bismuth Triiodide)". Inorganic Syntheses. 4: 114–116. doi:10.1002/9780470132357.ch38.
  7. Erdmann, Hugo; Dunlap, Frederick Leavy (1900), Handbook of Basic Tables for Chemical Analysis, New York: John Wiley & Sons, p. 76, retrieved 2008-06-19
  8. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 559. ISBN 978-0-08-037941-8.
  9. Bruno, Thomas J.; Svoronos, Paris D. N. (2003), Handbook of Basic Tables for Chemical Analysis, CRC Press, p. 549, ISBN 0-8493-1573-5, retrieved 2008-06-19
  10. Norman, Nicholas C. (1998), Chemistry of Arsenic, Antimony and Bismuth, Springer, pp. 168–70, ISBN 0-7514-0389-X, retrieved 2008-06-19
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