Titanium(III) bromide
# Titanium(III) bromide

Titanium(III) bromide is the inorganic compound with the formula $TiBr_3.$ 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

$TiBr_3$ can be produced by heating the tetrabromide in an atmosphere of hydrogen:

    2 $TiBr_4$ + $H_2$ → 2 $TiBr_3$ + 2 HBr

It can also be produced by comproportionation of titanium metal and titanium tetrabromide.

    Ti + 3 $TiBr_4$ → 4 $TiBr_3$

Two polymorphs of $TiBr_3$ are known, each exhibiting octahedral Ti centers.

## Reactions

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

    2 $TiBr_3$ → $TiBr_4$ + $TiBr_2$

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

    $TiBr_3$ + 3 L → $TiBr_3L_3$
