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:1
2 T i + 3 I 2 ⟶ 2 T i I 3 {\displaystyle \mathrm {2\ Ti+3\ I_{2}\longrightarrow 2\ TiI_{3}} }It can also be obtained by reduction of TiI4, e.g., with aluminium.2
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.3
References
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. /wiki/Academic_Press ↩
Catherine E. Housecroft, A. G. Sharpe (2005), Inorganic Chemistry (in German), Pearson Education, p. 601, ISBN 0-13-039913-2 0-13-039913-2 ↩
Angelkort, Joachim; Schoenleber, Andreas; van Smaalen, Sander (2009). "Low- and High-Temperature Crystal Structures of TiI3". Journal of Solid State Chemistry. 182 (3): 525–53. Bibcode:2009JSSCh.182..525A. doi:10.1016/j.jssc.2008.11.028.. /wiki/Journal_of_Solid_State_Chemistry ↩