Aluminium iodide explained

Aluminium iodide is a chemical compound containing aluminium and iodine. Invariably, the name refers to a compound of the composition, formed by the reaction of aluminium and iodine[1] or the action of on metal. The hexahydrate is obtained from a reaction between metallic aluminum or aluminum hydroxide with hydrogen iodide or hydroiodic acid. Like the related chloride and bromide, is a strong Lewis acid and will absorb water from the atmosphere. It is employed as a reagent for the scission of certain kinds of C-O and N-O bonds. It cleaves aryl ethers and deoxygenates epoxides.[2]

Structure

Solid is dimeric, consisting of, similar to that of .[3] The structure of monomeric and dimeric forms have been characterized in the gas phase.[4] The monomer,, is trigonal planar with a bond length of 2.448(6) Å, and the bridged dimer,, at 430 K is a similar to and with bond lengths of 2.456(6) Å (terminal) and 2.670(8) Å (bridging). The dimer is described as floppy with an equilibrium geometry of D2h.

Aluminium(I) iodide

See main article: Aluminium monoiodide. The name "aluminium iodide" is widely assumed to describe the triiodide or its dimer. In fact, a monoiodide also enjoys a role in the Al–I system, although the compound AlI is unstable at room temperature relative to the triiodide:[5]

3AlI -> AlI3 + 2AlAn illustrative derivative of aluminium monoiodide is the cyclic adduct formed with triethylamine, .

Notes and References

  1. Book: 10.1002/9780470132357.ch39. Aluminum Iodide. Inorganic Syntheses. 4. 117–119. 1953. Watt. George W. Hall. James L. Taylor. William Lloyd. Kleinberg. Jacob. 9780470132357.
  2. Book: Gugelchuk, M. . Aluminum Iodide. Encyclopedia of Reagents for Organic Synthesis . L. Paquette. 2004. J. Wiley & Sons. New York. 10.1002/047084289X.ra083. 0471936235.
  3. Troyanov. Sergey I.. Krahl. Thoralf. Kemnitz. Erhard. Crystal structures of and . Zeitschrift für Kristallographie. 219. 2–2004. 2004. 88–92. 10.1524/zkri.219.2.88.26320. 101603507.
  4. Hargittai. Magdolna. Réffy. Balázs. Kolonits. Mária. An Intricate Molecule: Aluminum Triiodide. Molecular Structure of and from Electron Diffraction and Computation. The Journal of Physical Chemistry A. 110. 10. 2006. 3770–3777. 10.1021/jp056498e. 16526661.
  5. Aluminum(I) and Gallium(I) Compounds: Syntheses, Structures, and Reactions. Dohmeier, C. . Loos, D. . Schnöckel, H. . Angewandte Chemie International Edition . 1996. 35. 2 . 129–149. 10.1002/anie.199601291.