Titanium(III) iodide

Titanium(III) iodide
Names
	IUPAC name Titanium(III) iodide
	Other names Titanium triiodide
Identifiers
CAS Number	13783-08-9 ;
3D model (JSmol)	Interactive image;
PubChem CID	18955717;
CompTox Dashboard (EPA)	DTXSID001314238 ;
	InChI InChI=1S/3HI.Ti/h3*1H;/q;;;+3/p-3 Key: HUYLAMJIPCOVOM-UHFFFAOYSA-K;
	SMILES I[Ti](I)I;
Properties
Chemical formula	I3Ti
Molar mass	428.580 g·mol−1
Appearance	black-violet solid
Density	4.96 g·cm−3
Related compounds
Other anions	Titanium(III) fluoride; Titanium(III) bromide; Titanium(III) chloride
Other cations	Zirconium(III) iodide; Hafnium(III) iodide
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]

\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

^ ^a ^b 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..
^ 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.
^ Catherine E. Housecroft, A. G. Sharpe (2005), Inorganic Chemistry (in German), Pearson Education, p. 601, ISBN 0-13-039913-2

[DOI10.1016/j.jssc.2008.11.028-1] 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..

[brauer-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.

[Catherine_E._Housecroft,_A._G._Sharpe-3] Catherine E. Housecroft, A. G. Sharpe (2005), Inorganic Chemistry (in German), Pearson Education, p. 601, ISBN 0-13-039913-2

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