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Titanium tetrabromide is the chemical compound with the formula TiBr4. It is the most volatile transition metal bromide. The properties of TiBr4 are an average of TiCl4 and TiI4. Some key properties of these four-coordinated Ti(IV) species are their high Lewis acidity and their high solubility in nonpolar organic solvents. TiBr4 is diamagnetic, reflecting the d0 configuration of the metal centre.
Additional recommended knowledge
Preparation and structure
This four-coordinated complex adopts a tetrahedral geometry. It can be prepared via several methods: (i) from the elements, (ii) via the reaction of TiO2 with carbon and bromine (see Kroll process), and (iii) by treatment of TiCl4 with HBr.
TiBr4 forms adducts such as TiBr4(THF)2 and [TiBr5]-. With bulky donor ligands, such as 2-methylpyridine (2-Mepy), five-coordinated adducts form. TiBr4(2-MePy) is trigonal bipyramidal with the pyridine in the equatorial plane.
TiBr4 reacts rapidly with TiCl4 to give a statistical mixture of the tetrahalides, TiBr4-xClx (x = 0-4). The mechanism of this exchange is a matter of some dispute; a reasonable pathway involves the intermediacy of dimers.
TiBr4 hydrolyzes rapidly, potentially dangerously, to release hydrogen bromide.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Titanium_tetrabromide". A list of authors is available in Wikipedia.|