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Aluminium iodide

Chemical compound

Aluminium iodide

Chemical compound

Aluminum iodide

Aluminium triiodide

Aluminum triiodide 515.786 g/mol (hexahydrate) 185 °C, decomposes (hexahydrate)

Aluminium iodide is the inorganic compound with the composition . It also exists a various hydrates formed by exposure of the anhydrous material to water. For example the hexahydrate is obtained from a reaction between metallic aluminum or aluminum hydroxide with 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.

Preparation

Aluminium iodide is formed by the reaction of aluminium and iodine or the action of on metal.

Structure

Solid is dimeric, consisting of , similar to that of . The structure of monomeric and dimeric forms have been characterized in the gas phase. 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

Main article: Aluminium monoiodide

2Al(s) + 3I2(s) -> 2AlI3(s)}} is at the origin of the phenomenon observed.

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: : An illustrative derivative of aluminium monoiodide is the cyclic adduct formed with triethylamine, .

References

References

  1. {{RubberBible92nd
  2. Perry, Dale L.. (19 April 2016). "Handbook of Inorganic Compounds, Second Edition". CRC Press.
  3. (2014). "Crystal structures of hydrates of simple inorganic salts. III. Water-rich aluminium halide hydrates: AlCl3·15H2O, AlBr3·15H2O, AlI3·15H2O, AlI3·17H2O and AlBr3·9H2O". Acta Crystallographica Section C Structural Chemistry.
  4. Gugelchuk, M.. (2004). "Encyclopedia of Reagents for Organic Synthesis". J. Wiley & Sons.
  5. (1953). "Inorganic Syntheses".
  6. (2004). "Crystal structures of {{math". Zeitschrift für Kristallographie.
  7. (2006). "An Intricate Molecule: Aluminum Triiodide. Molecular Structure of {{math". The Journal of Physical Chemistry A.
  8. (1996). "Aluminum(I) and Gallium(I) Compounds: Syntheses, Structures, and Reactions". Angewandte Chemie International Edition.
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iodides aluminium-compounds metal-halides
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