Germanium_tetraiodide

Germanium(IV) iodide

Germanium(IV) iodide

Chemical compound

Germanium(IV) iodide is an inorganic compound with the chemical formula GeI4.

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Preparation

Germanium(IV) iodide can be obtained by the reaction of germanium and iodine[2] or the reaction of germanium dioxide and 57% hydriodic acid:[1]

GeO2 + 4 HI → GeI4 + 2 H2O

Chemical properties

Germanium(IV) iodide reacts with tetraalkyl tin at 250 °C to form R2SnI2 and R2GeI2 (R= Et, Bu, Ph).[5] It reacts with germanium and sulfur at high temperatures to produce red GeSI2 and orange Ge2S3I2.[6] It reacts with diiron nonacarbonyl in an ionic liquid ([BMIm]Cl/AlCl3) at 130 °C to obtain Ge12[Fe(CO)3]8I4.[7]

12 GeI4 + 15 Fe2(CO)9 → Ge12[Fe(CO)3]8I4 + 22 FeI2 + 111 CO↑

Physical properties

Germanium(IV) iodide is an orange-red crystalline solid that hydrolyzes in water. It is soluble in carbon disulfide and benzene, but less soluble in carbon tetrachloride and chloroform.[3] It begins to decompose into germanium(II) iodide and iodine above its melting point.[8] Germanium(IV) iodide crystallizes in the cubic crystal system, space group Pa3 (space group no. 205), with the lattice parameter a = 11.89 Å. The crystal structure consists of tetrahedral GeI4 molecules.

References

  1. [1]
    A. W. Laubengayer, P. L. Brandt (Feb 1932). "The Preparation of Germanium Tetrabromide and Germanium Tetraiodide". Journal of the American Chemical Society. 54 (2): 621–623. doi:10.1021/ja01341a502. ISSN 0002-7863. Archived from the original on 2021-10-20. Retrieved 2021-01-12.
  2. [2]
    L. M. Dennis, F. E. Hance (Dec 1922). "GERMANIUM. IV. GERMANIUM TETRA-IODIDE1". Journal of the American Chemical Society. 44 (12): 2854–2860. doi:10.1021/ja01433a020. ISSN 0002-7863. Retrieved 2021-01-12.
  3. [3]
    Schenk, P.W. (1963). "12. Silicon and Germanium". In Brauer, Georg (ed.). Handbook of preparative inorganic chemistry (Second ed.). Academic Press. p. 719. doi:10.1016/B978-0-12-395590-6.50020-X. ISBN 978-0-12-395590-6.
  4. [4]
    "Germanium tetraiodide". pubchem.ncbi.nlm.nih.gov.
  5. [5]
    Kocheshkov, K. A.; Fomina, N. V.; Sheverdina, N. I.; Zemlyanskii, N. N.; Chernoplekova, V. A. Reaction of tetraalkyltin with germanium tetrahalides. Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1973. 3: 711. ISSN: 0002-3353.
  6. [6]
    A.P. Velmuzhov, M.V. Sukhanov, A.D. Plekhovich, A.I. Suchkov, V.S. Shiryaev (Mar 2015). "Thermal decomposition study of GeSI2 and Ge2S3I2 glassy alloys". Journal of Non-Crystalline Solids. 411: 40–44. Bibcode:2015JNCS..411...40V. doi:10.1016/j.jnoncrysol.2014.09.018. Retrieved 2021-01-12.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  7. [7]
    Silke Wolf, Wim Klopper, Claus Feldmann (2018). "Ge 12 {Fe(CO) 3 } 8 (μ-I) 4 : a germanium–iron cluster with Ge 4 , Ge 2 and Ge units". Chemical Communications. 54 (10): 1217–1220. doi:10.1039/C7CC08091C. ISSN 1359-7345. PMID 29336437. Retrieved 2021-01-12.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  8. [8]
    Holleman, Arnold F.; Wiberg, Egon; Wiberg, Nils (1995). Lehrbuch der anorganischen Chemie (101., verb. und stark erw. Aufl ed.). Berlin: de Gruyter. ISBN 978-3-11-012641-9.
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