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.

Production and structure
TiBr3 can be produced by heating the tetrabromide in an atmosphere of hydrogen:
 * 2TiBr4 +  H2   →   2TiBr3  +  2HBr

It can also be produced by comproportionation of titanium metal and titanium tetrabromide.
 * Ti +  3TiBr4   →   4TiBr3

Two polymorphs of TiBr3 are known, each exhibiting octahedral Ti centers.

Reactions
Heating the tribromide gives titanium(II) bromide together with the volatile tetrabromide:
 * 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