Titanium(III) bromide

Titanium(III) bromide is the inorganic compound with the formula TiBr₃. It is a blue black paramagnetic solid with a reddish reflection. It has few applications, although it is a catalyst for the polymerization of alkenes.

Titanium(III) bromide

Names
IUPAC name Titanium(III) bromide
Other names Titanium tribromide Tribromotitanium
Identifiers
CAS Number	13135-31-4
3D model (JSmol)	Interactive image
ChemSpider	120705 Y
PubChem CID	136975
CompTox Dashboard (EPA)	DTXSID601045966
InChI InChI=1S/3BrH.Ti/h3*1H;/q;;;+3/p-3 Key: MTAYDNKNMILFOK-UHFFFAOYSA-K
SMILES [Ti](Br)(Br)Br
Properties
Chemical formula	TiBr3
Molar mass	287.579 g/mol
Appearance	blue-black solid
Hazards
NFPA 704 (fire diamond)	0 0 0
Related compounds
Other anions	Titanium(III) chloride Titanium(III) fluoride
Related compounds	Titanium(IV) bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Production and structure

TiBr₃ can be produced by heating the tetrabromide in an atmosphere of hydrogen:^[3]

2 TiBr₄ + H₂ → 2 TiBr₃ + 2 HBr

It can also be produced by comproportionation of titanium metal and titanium tetrabromide.^[4][5]

Ti + 3 TiBr₄ → 4 TiBr₃

Two polymorphs of TiBr₃ are known, each exhibiting octahedral Ti centers.^[4]

Reactions

Heating the tribromide gives titanium(II) bromide together with the volatile tetrabromide:^[3]

2 TiBr₃ → TiBr₄ + TiBr₂

The solid dissolves in donor solvents (L) such as pyridine and nitriles to produce 3:1 adducts:

TiBr₃ + 3 L → TiBr₃L₃