Tin(IV) bromide

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Tin(IV) bromide

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Template:Longitem	SnBr4
Molar mass	438.33 g/mol
Appearance	colourless
Density	3.340 g/cm3 (at 35 °C)
Melting point	Template:Chembox CalcTemperatures
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Template:Longitem	−149.0·10−6 cm3/mol
Template:Longitem	Tin(IV) fluoride Tin(IV) chloride Tin(IV) iodide
Template:Longitem	Carbon tetrabromide Silicon tetrabromide Germanium tetrabromide

Tin(IV) bromide is the chemical compound SnBr₄. It is a colourless low melting solid.

Structure

SnBr₄ crystallises in a monoclinic crystal system with molecular SnBr₄ units that have distorted tetrahedral geometry. The mean Sn-Br bond length is 242.3 pm.

Preparation

SnBr₄ can be prepared by reaction of the elements at standard temperature and pressure (STP):

Template:Chem/link + 2Template:Chem/link → Template:Chem/link

Reactions

In aqueous solution SnBr₄ dissolves to give a series of octahedral (six-ligated) bromo-aquo complexes. These include Template:Chem2 and cis- and trans-Template:Chem2.

SnBr₄ forms 1:1 and 1:2 complexes with ligands. With trimethylphosphine both Template:Chem2.

Tin(IV) bromide undergoes redistribution with tin(IV) chloride as assessed by ¹¹⁹Sn NMR and Raman spectroscopy. Equilibrium is achieved in seconds at room temperature. By contrast, halide exchange for related germanium and especially silicon halides is slower.