|Preferred IUPAC name
3D model (Jmol)
|UN number||UN 3260|
|Molar mass||407.69495 g/mol (anhydrous)
515.786 g/mol (hexahydrate)
but impure samples
are often brown
|Density||3.98 g/cm3 (anhydrous)
2.63 g/cm3 (hexahydrate)
|Melting point||189.4 °C (372.9 °F; 462.5 K) (anhydrous)
185 °C, decomposes (hexahydrate)
|Boiling point||360 °C (680 °F; 633 K) , sublimes|
|reacts violently (anhydrous)
|Solubility in alcohol, ether||soluble (hexahydrate)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Aluminium iodide is any chemical compound containing only aluminium and iodine. Invariably, the name refers to a compound of the composition AlI
3, formed by the reaction of aluminium and iodine or the action of HI on Al 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, AlI
3 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.
3 is dimeric, consisting of Al
6, similar to that of AlBr3. The structure of monomeric and dimeric forms have been characterized in the gas phase. The monomer, AlI
3 is trigonal planar with a bond length of 2.448(6) Å, and the bridged dimer, Al
6 at 430 K is a similar to Al2Cl6 and Al2Br6 with Al–I 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.
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
- 3 AlI → AlI
3 + 2 Al
- G. W. Watt; J. L. Hall (1953). Inorganic Syntheses. IV. pp. 117–119.
- M. Gugelchuk (2004). Aluminum Iodide, in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette). New York: J. Wiley & Sons. doi:10.1002/047084289X.ra083.
- Troyanov, Sergey I.; Krahl, Thoralf; Kemnitz, Erhard (2004). "Crystal structures of GaX3(X= Cl, Br, I) and AlI3". Zeitschrift für Kristallographie. 219 (2-2004): 88–92. doi:10.1524/zkri.220.127.116.11320. ISSN 0044-2968.
- Hargittai, Magdolna; Réffy, Balázs; Kolonits, Mária (2006). "An Intricate Molecule: Aluminum Triiodide. Molecular Structure of AlI3and Al2I6 from Electron Diffraction and Computation". The Journal of Physical Chemistry A. 110 (10): 3770–3777. doi:10.1021/jp056498e. ISSN 1089-5639.
- Dohmeier, C.; Loos, D.; Schnöckel, H. (1996). "Aluminum(I) and Gallium(I) Compounds: Syntheses, Structures, and Reactions". Angewandte Chemie International Edition. 35: 129–149. doi:10.1002/anie.199601291.