Aluminium iodide

 ( Iodides ) 

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

or the action of Hydrogen iodide 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 diethyl ether and deoxygenates .

Gugelchuk, M. (2025). 9780471936237, J. Wiley & Sons. ISBN 9780471936237

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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 D_2h.

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Aluminium(I) iodide 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, .

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