# Boron triiodide

Boron triiodide[1]
Names
IUPAC name
triiodoborane
Identifiers
3D model (Jmol)
ChemSpider
ECHA InfoCard 100.033.492
RTECS number ED7400000
Properties
BI3
Molar mass 391.52 g/mol
Appearance crystalline solid
Density 3.35 g/cm3 (50 °C)
Melting point 49.9 °C (121.8 °F; 323.0 K)
Boiling point 210 °C (410 °F; 483 K)
reacts
Solubility soluble in CCl4, CS2, benzene, chloroform
0D
Structure
trigonal
Thermochemistry
71 J/mol K
200 J/mol K
-37.2 kJ/mol
Hazards
Safety data sheet Sigma-Aldrich
NFPA 704
Flash point −18 °C (0 °F; 255 K)
Related compounds
Related compounds
Boron trifluoride
Boron trichloride
Boron tribromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Boron triiodide is a chemical compound of boron and iodine with chemical formula BI3. It has a trigonal planar molecular geometry. It is a crystalline solid, which reacts vigorously with water to form boric acid.[2] Its dielectric constant is 5.38 and its heat of vaporization is 40.5 kJ/mol. At extremely high pressures, BI3 becomes metallic at ~23 GPa and is a superconductor above ~27 GPa. [3]

## Preparation

Boron triiodide can be prepared by the reaction of boron with iodine at 209.5 °C or 409.1 °F.[citation needed] It can also be prepared by this other method: ${\displaystyle {\ce {{3HI}+BCl3->{BI3}+3HCl}}}$ (this reaction requires high temperature).

## References

1. ^ Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.