Titanium(III) iodide is an
inorganic compound with the formula TiI
3. It is a dark violet solid that is insoluble in solvents, except upon decomposition.
Preparation and structure
Titanium(III) iodide can be prepared by reaction of titanium with
iodine:
[F. Hein, S. Herzog "Molybdenum(III) Bromide" in Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1407.]
:
It can also be obtained by reduction of TiI
4, e.g., with
aluminium
Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. I ...
.
In terms of its structure, the compound exists as a polymer of face-sharing octahedra. Above 323 K, the Ti---Ti spacing are equal, but below that temperature, the material undergoes a
phase transition
In chemistry, thermodynamics, and other related fields, a phase transition (or phase change) is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states o ...
. In the low temperature phase, the Ti---Ti contacts are alternating short and long. The low temperature structure is similar to that of
molybdenum tribromide.
[.]
References
{{Iodides
Titanium(III) compounds
Iodides
Inorganic polymers