Iron(II) iodide

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Iron(II) iodide
Names
IUPAC name
Iron(II) iodide
Other names
Ferrous iodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.119 Edit this at Wikidata
EC Number
  • 232-031-2
UNII
  • InChI=1S/Fe.2HI/h;2*1H/q+2;;/p-2
    Key: BQZGVMWPHXIKEQ-UHFFFAOYSA-L
  • InChI=1/Fe.2HI/h;2*1H/q+2;;/p-2
    Key: BQZGVMWPHXIKEQ-NUQVWONBAN
  • [Fe+2].[I-].[I-]
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
Related Iron iodides
 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

Iron(II) iodide is an inorganic compound with the chemical formula FeI2.[1][2] It is used as a catalyst in organic reactions.

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

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]

The thermal decomposition of iron(II) iodide tetrahydrate produces iron(II) hydroxide-iodide, hydrogen iodide, and water:[citation needed]

FeI2•4H2O → Fe(OH)I + HI + 3 H2O

This reaction takes place at a temperature of over 100 °C.

See also[]

References[]

  1. ^ a b c d e Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 1083–1084. ISBN 978-0-08-037941-8.
  2. ^ University of Akron Chemical Database Archived 2012-12-12 at archive.today


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