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| Names | |||
|---|---|---|---|
| IUPAC name triiodoborane | |||
| Identifiers | |||
3D model (JSmol) | |||
| ChemSpider |
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| ECHA InfoCard | 100.033.492 | ||
| RTECS number |
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| 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) | ||
| soluble,hydrolysis | |||
| Solubility | soluble inCCl4,CS2,benzene,chloroform | ||
| 0D | |||
| Structure | |||
| hexagonal | |||
| Thermochemistry | |||
| 71 J/mol K | |||
Std molar entropy(S⦵298) | 200 J/mol K | ||
Std enthalpy of formation(ΔfH⦵298) | −37.2 kJ/mol | ||
| Hazards | |||
| NFPA 704 (fire diamond) | |||
| Flash point | −18 °C (0 °F; 255 K) | ||
| Safety data sheet (SDS) | Sigma-Aldrich | ||
| Related compounds | |||
Related compounds | Boron trifluoride Boron trichloride Boron tribromide | ||
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |||
Boron triiodide is achemical compound ofboron andiodine withchemical formula BI3. It has atrigonal planar molecular geometry.
Boron triiodide can be prepared by the reaction ofboron withiodine at 209.5 °C or 409.1 °F.[citation needed]It can also be prepared by reacting hydroiodic acid withboron trichloride:
Another method is by reactinglithium borohydride with iodine. As well as boron triiodide, this reaction also produceslithium iodide,hydrogen andhydrogen iodide:[2]
In its pure state, boron triiodide forms colorless, otherwise reddish, shiny, air and hydrolysis-sensitive[3] crystals, which have a hexagonal crystal structure (a = 699.09 ± 0.02 pm, c = 736.42 ± 0.03 pm,space groupP63/m (space group no. 176)).[4] Boron triiodide is a strong Lewis acid and soluble in carbon disulfide.[2]
Boron triiodide reacts with water and decomposes to boric acid and hydriodic acid:
Itsdielectric constant is 5.38 and itsheat of vaporization is 40.5 kJ/mol. At extremely high pressures, BI3 becomes metallic at ~23 GPa and is a superconductor above ~27 GPa.[5]
Boron triiodide can be used to produce other chemical compounds and as acatalyst (for example incoal liquefaction).[6]
