# Titanium(III) iodide

Names Identifiers IUPAC name Titanium(III) iodide Other names Titanium triiodide CAS Number 13783-08-9 3D model (JSmol) Interactive image SMILES I[Ti](I)I Chemical formula I3Ti Molar mass 428.580 g·mol−1 Appearance black-violet solid Density 4.96 g·cm−3[1] Other anions Titanium(III) bromide Titanium(III) chloride Titanium(III) fluoride Related compounds Titanium(IV) iodide Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Titanium(III) iodide is an inorganic compound with the formula TiI3. 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:[2]

${\displaystyle \mathrm {2\ Ti+3\ I_{2}\longrightarrow 2\ TiI_{3}} }$

It can also be obtained by reduction of TiI4, e.g., with aluminium .[3]

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 the low temperature phase, the Ti---Ti contacts are alternating short and long. The low temperature structure is similar to that of molybdenum tribromide.[1]

## References

1. ^ a b Joachim Angelkort, Andreas Schoenleber, Sander van Smaalen: Low- and high-temperature crystal structures of. In: Journal of Solid State Chemistry. 182, 2009, S. 525–531, doi:10.1016/j.jssc.2008.11.028.
2. ^ 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.
3. ^ Catherine E. Housecroft, A. G. Sharpe (2005), Inorganic Chemistry (in German), Pearson Education, p. 601, ISBN 0-13039913-2