Aluminium iodide
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Aluminium iodide is a chemical compound containing aluminium and iodine. Invariably, the name refers to a compound of the composition Template:Math, formed by the reaction of aluminium and iodine[1] or the action of [[Hydrogen iodide|Template:Chem]] on Template:Chem 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, Template:Math 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 Template:Math is dimeric, consisting of Template:Chem, similar to that of [[aluminium tribromide|Template:Chem]].[3] The structure of monomeric and dimeric forms have been characterized in the gas phase.[4] The monomer, Template:Math, is trigonal planar with a bond length of 2.448(6) Å, and the bridged dimer, Template:Chem, at 430 K is a similar to [[Aluminium chloride|Template:Chem]] and [[Aluminium bromide|Template:Chem]] with Template:Chem2 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
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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]
An illustrative derivative of aluminium monoiodide is the cyclic adduct formed with triethylamine, Template:Chem.