Titanium tetraiodide

Titanium tetraiodide

Chembox new
Name = Titanium tetraiodide
ImageFile = Titanium-tetraiodide-3D-balls.png ImageName = Titanium tetraiodide
ImageFile1 = Titanium-tetraiodide-3D-vdW.png ImageName1 = Titanium tetraiodide
IUPACName = Titanium(IV) iodide
OtherNames = Titanium tetraiodide
Section1 = Chembox Identifiers
CASNo = 7720-83-4

Section2 = Chembox Properties
Formula = TiI4
MolarMass = 555.49 g/mol
Appearance = red-brown crystals
Density = 4.3 g/cm3
Solubility = hydrolysis
Solvent = other solvents
SolubleOther = CH2Cl2
MeltingPt = 150 °C
BoilingPt = 377°C

Section3 = Chembox Structure
Coordination = tetrahedral
CrystalStruct = cubic ("a" = 12.21 Å)
Dipole = 0 D

Section7 = Chembox Hazards
ExternalMSDS =
MainHazards = violent hydrolysis
RPhrases = 34-37
SPhrases = 26-36/37/39-45

Section8 = Chembox Related
Function = compounds
OtherFunctn = titanium tetrachloride,
|titanium tetrabromide,
carbon tetraiodide,

Titanium tetraiodide is the inorganic compound with the formula TiI4. It is a rare molecular binary metal iodide, consisting of isolated molecules of tetrahedral Ti(IV) centers; [cite journal | author= Tornqvist EGM, Libby WF | title= Crystal Structure, Solubility, and Electronic Spectrum of Titanium Tetraiodide | journal= Inorganic Chemistry| year= 1979 | volume= 18 | pages= 1792 | doi= 10.1021/ic50197a013 [http://dx.doi.org/10.1021/ic50197a013 DOI] ] the other example is Ta2I10. Reflecting its molecular character, TiI4 can be distilled without decomposition at one atmosphere. The compound is a close relative to TiCl4. The difference in melting point between TiCl4 (m.p. -24 °C) and TiI4 (m.p. 150 °C) is comparable to the difference between the melting points of CCl4 (m.p. -23 °C) and CI4 (m.p. 168 °C), reflecting the stronger intermolecular van der Waals bonding in the iodides.


Three methods are well known:1) From the elements, typically using a tube furnace at 425 °C: [Lowery, R. N.; Fay, R. C. "Titanium(IV) Iodide" Inorganic Syntheses 1967, volume X, pages 1-6.] ::Ti + 2 I2 → TiI4This reaction can be reversed to produce highly pure films of Ti metal. [cite journal | author= Blumenthal WB, Smith H | title= Titanium tetraiodide, Preparation and Refining | journal= Industrial and Engenieering Chemistry | year= 1950 | volume= 2 | pages= 249 [http://dx.doi.org/10.1021/ie50482a016 DOI] ]

2) Exchange reaction from titanium tetrachloride and HI.::TiCl4 + 4 HI → TiI4 + 4 HCl3) Oxide-iodide exchange from aluminium iodide.::3 TiO2 + 4 AlI3 → 3 TiI4 + 2 Al2O3


Like TiCl4 and TiBr4, TiI4 forms adducts with Lewis bases, and it can also be reduced. When the reduction is conducted in the presence of Ti metal, one obtains polymeric Ti(III) and Ti(II) derivatives such as CsTi2I7 and the chain CsTiI3, respectively. [Jongen, L.; Gloger, T.; Beekhuizen, J.; Meyer, G. "Divalent Titanium: The Halides ATiX3 (A = K, Rb, Cs; X = Cl, Br, I)" Zeitschrift fur Anorganische und Allgemeine Chemie 2005, volume 631, pages 582-586.] As a solution in CH2Cl2, TiI4 exhibits some reactivity toward alkenes and alkynes resulting in organoiodine derivatives. [Shimizu, Makoto; Toyoda, Tadahiro; Baba, Toru. An Intriguing Hydroiodination of Alkenes and Alkynes with Titanium Tetraiodide. Synlett 2005, volume 16, pages 2516-2518.]


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