Aluminium iodide

Aluminium iodide is the inorganic compound with the composition AlI3. 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, AlI3 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 Hydrogen iodide| on metal. ==Structure==

Structure

Solid is dimeric, consisting of , similar to that of aluminium tribromide|. 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 Aluminium chloride| and Aluminium bromide| 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==

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, . ==References==

Source: Wikipedia ↗

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