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Europium(III) iodide

From Wikipedia, the free encyclopedia
Europium(III) iodide[1]
Names
IUPAC name
Europium(III) iodide
Other names
Europium triiodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard100.033.941Edit this at Wikidata
EC Number
  • 244-721-0
  • InChI=1S/Eu.3HI/h;3*1H/q+3;;;/p-3
    Key: OEGMUYNEEQNVBV-UHFFFAOYSA-K
  • [I-].[I-].[I-].[Eu+3]
Properties
EuI
3
Molar mass532.677 g mol−1
Appearancecolourless crystals[2]
Melting pointdecomposes[1]
Structure[1][3][4]
BiI3
octahedral
Related compounds
Otheranions
EuF3,EuCl3,EuBr3
Othercations
SmI3,GdI3
Related compounds
EuI2
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
Chemical compound

Europium(III) iodide is aninorganic compound containingeuropium andiodine with the chemical formulaEuI3.[1]

Preparation

[edit]

Europium metal reacts directly with iodine to form europium(III) iodide:[5]

2 Eu + 3 I2 → 2 EuI3

Hydrated europium(III) iodide can be prepared dissolvingeuropium(III) oxide oreuropium(III) carbonate inhydroiodic acid:[1][6]

Eu2O3 + 6 HI + 6 H2O → 2 EuI3·9H2O

Europium powder reacts with iodine inTHF to form a THFadduct of europium(III) iodide:[7][8]

2 Eu + 3 I2 + 7 THF → [EuI2(THF)5][EuI4(THF)2]

The adduct can be formulated more simply asEuI3(THF)3.5.

Structure

[edit]

Europium(III) iodide adopts thebismuth(III) iodide (BiI3) crystal structure type,[3][4] withoctahedral coordination of each Eu3+ ion by 6iodide ions.[1]

Reactivity

[edit]

Europium(III) iodide is used as the starting material for two of the main ways of preparingeuropium(II) iodide:[9]

Reduction withhydrogen gas at 350 °C:

2 EuI3 + H2 → 2 EuI2 + 2 HI

Thermal decomposition[1] at 200 °C, adisproportionation reaction:

2 EuI3 → 2 EuI2 + 2 I2

Europium(III) iodide nonahydrate, EuI3·9H2O, thermally decomposes to europium(II) iodide dihydrate, EuI2·H2O.[10]

References

[edit]
  1. ^abcdefgGreenwood, Norman N.; Earnshaw, Alan (1997).Chemistry of the Elements (2nd ed.).Butterworth-Heinemann. pp. 1240–1241.ISBN 978-0-08-037941-8.
  2. ^William M. Haynes, ed. (2014).CRC Handbook of Chemistry and Physics (95th ed.).CRC Press. p. 4-63.ISBN 978-1482208689.
  3. ^abWells, A. F. (1984).Structural Inorganic Chemistry (5th ed.). Oxford University Press. p. 421.ISBN 978-0-19-965763-6.
  4. ^abAsprey, L. B.; Keenan, T. K.; Kruse, F. H. (1964)."Preparation and Crystal Data for Lanthanide and Actinide Triiodides".Inorg. Chem.3 (8):1137–1141.doi:10.1021/ic50018a015.
  5. ^Holleman, A. F.; Wiberg, E. (2001).Inorganic Chemistry. San Diego: Academic Press.ISBN 0-12-352651-5.
  6. ^Emel'yanov, V. I.; Kuznetsova, L. I.; Abramova, L. V.; Ezhov, A. I. (1997)."Systems Eu2O3-HI-H2O and EuI3-HI-H2O at 25°C".Zh. Neorg. Khim.42 (8):1394–1396.
  7. ^Ortu, Fabrizio (2022)."Rare Earth Starting Materials and Methodologies for Synthetic Chemistry".Chem. Rev.122:6040–6116.doi:10.1021/acs.chemrev.1c00842.PMC 9007467.
  8. ^Gompa, Thaige P.; Rice, Natalie T.; Russo, Dominic R.; Aguirre Quintana, Luis M.; Yik, Brandon J.; Basca, John; La Pierre, Henry S. (2019). "Diethyl ether adducts of trivalent lanthanide iodides".Dalton Trans.48:8030–8033.doi:10.1039/C9DT00775J.
  9. ^Brauer, Georg (1975).Handbook of Preparative Inorganic Chemistry.ISBN 3-432-02328-6.
  10. ^Jenden, Charles M.; Lyle, Samuel J. (1982). "A Mössbauer spectroscopic study of the lodides of europium".J. Chem. Soc., Dalton Trans. (12):2409–2414.doi:10.1039/DT9820002409.
Europium(II)
Europium(III)
Organoeuropium(III)
Salts and covalent derivatives of theiodide ion
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