Iron(III) iodide

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Iron(III) iodide
Names
IUPAC name
Iron(III) iodide
Other names
Ferric iodide
Identifiers
3D model (
JSmol
)
ChemSpider
  • InChI=1S/Fe.3HI/h;3*1H/q+3;;;/p-3
    Key: HEJPGFRXUXOTGM-UHFFFAOYSA-K
  • [Fe+3].[I-].[I-].[I-]
Properties
FeI3
Molar mass 436.56 g/mol
Appearance Black solid
decomposes
Solubility sparingly soluble in dichloromethane
Related compounds
Other anions
 FeF3, FeCl3, FeBr3
Other cations
ScI3, TiI3, VI3, MoI3, WI3, RhI3, BiI3
Related compounds
 FeI2
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Iron(III) iodide is an inorganic compound with the chemical formula FeI3. It is a thermodynamically unstable compound that is difficult to prepare. Nevertheless, iron(III) iodide has been synthesised in small quantities in the absence of air and water.[1]

Preparation

Iron(III) and iodide tend to undergo a

photochemical reaction. Iron pentacarbonyl reacts with excess iodine in hexane under argon, releasing carbon monoxide and forming the complex diiodotetracarbonyliron(II), Fe(CO)4I2, as a light red solution.[1][2]

Fe(CO)5 + I2 → Fe(CO)4I2 + CO

This complex then undergoes oxidative photodecarbonylation at −20 °C in the presence of further iodine and

actinic light. A black film of FeI3 is deposited as further carbon monoxide is evolved.[1][2]

Fe(CO)4I2 + ½I2 + hν → FeI3 + 4CO

Reactivity

Iron(III) iodide is prone to light-induced decomposition to iron(II) iodide and iodine.[2][3][4]

FeI3 + hν → FeI2 + ½I2

hygroscopic. It is sparingly soluble in dichloromethane. It reacts with iodide to form the tetraiodoferrate(III) ion.[2]

FeI3 + I− → FeI4−

Iron(III) iodide undergoes

alkyl iodides.[2]

FeI3 + 3 RCl ⇌ FeCl3 + 3 RI

Adducts of FeI3 are well known. An orange complex can be prepared from FeI2 and I2 in the presence of thiourea.[5][6] Iron powder reacts with iodine-containing proligands to also give adducts of ferric iodide.[7]

See also

References

  1. ^
    ISBN 978-0-08-037941-8
    .
  2. ^
    doi:10.1021/ic00329a058
    .
  3. doi:10.1016/S0010-8545(02)00018-8
    .
  4. ISBN 978-0-13-175553-6
    .
  5. doi:10.1002/anie.198907761
    .
  6. doi:10.1002/zaac.19936190329
    .
  7. doi:10.1016/j.poly.2013.02.066
    .
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