Iron(II) iodide
Iron(II) iodide is an inorganic compound with the chemical formula FeI2.[1][2] It is used as a catalyst in organic reactions.
| Names | |
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| IUPAC name
Iron(II) iodide | |
| Other names
Ferrous iodide | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.029.119 |
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CompTox Dashboard (EPA) |
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| Properties | |
| FeI2 | |
| Molar mass | 309.65 g/mol |
| Appearance | White to off-white or grey[1] powder |
| Density | 5.315 g/cm3 |
| Melting point | 587 °C (1,089 °F; 860 K) |
| Boiling point | 827 °C (1,521 °F; 1,100 K) |
| soluble | |
| +13,600·10−6 cm3/mol | |
| Related compounds | |
Other anions |
Iron(II) fluoride Iron(II) chloride Iron(II) bromide |
Other cations |
Manganese(II) iodide Cobalt(II) iodide |
| Iron(III) iodide | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Preparation
Iron(II) iodide can be synthesised from the elements, i.e. by the reaction of iron with iodine.[1]
- Fe + I2 → FeI2
This is in contrast to the other iron(II) halides, which are best prepared by reaction of heated iron with the appropriate hydrohalic acid.
- Fe + 2HX → FeX2 + H2
In contrast to the ferrous fluoride, chloride and bromide, which form known hydrates, the diiodide is speculated to form a stable tetrahydrate but it not been characterized directly.[3]
Structure
Iron(II) iodide adopts the same crystal structure as cadmium iodide (CdI2).[1]
Reactions
Iron(II) iodide dissolves in water. Dissolving iron metal in hydroiodic acid is another route to aqueous solutions of iron(II) iodide. Crystalline hydrates precipitate from these solutions.[1]
See also
- Iron(III) iodide, FeI3, unstable
References
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 1083–1084. ISBN 978-0-08-037941-8.
- University of Akron Chemical Database Archived 2012-12-12 at archive.today
- Wren, J.C; Glowa, G.A; Merritt, J (1999). "Corrosion of stainless steel by gaseous I2". Journal of Nuclear Materials. 265 (1–2): 161–177. doi:10.1016/s0022-3115(98)00504-2. ISSN 0022-3115.