Tin(IV) bromide

Tin(IV) bromide is the chemical compound SnBr₄. It is a colourless low melting solid.^[1]

Tin(IV) bromide

Names
IUPAC name tetrabromostannate
Other names tin tetrabromide, stannic bromide, bromostannic acid
Identifiers
CAS Number	7789-67-5 Y
3D model (JSmol)	Interactive image
ChemSpider	23018 N
ECHA InfoCard	100.029.258
EC Number	232-184-5
PubChem CID	24616
UNII	23C21BW281 Y
CompTox Dashboard (EPA)	DTXSID1064873
InChI InChI=1S/4BrH.Sn/h4*1H;/q;;;;+4/p-4 N Key: LTSUHJWLSNQKIP-UHFFFAOYSA-J N InChI=1/4BrH.Sn/h4*1H;/q;;;;+4/p-4 Key: LTSUHJWLSNQKIP-XBHQNQODAB
SMILES Br[Sn](Br)(Br)Br
Properties
Chemical formula	SnBr4
Molar mass	438.33 g/mol
Appearance	colourless [1]
Density	3.340 g/cm3 (at 35 °C)[1]
Melting point	31 °C (88 °F; 304 K)[1]
Boiling point	205 °C (401 °F; 478 K)[1]
Solubility in water	soluble
Magnetic susceptibility (χ)	−149.0·10−6 cm3/mol
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314, H335
Precautionary statements	P260, P261, P264, P271, P280, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P319, P321, P363, P403+P233, P405, P501
Related compounds
Other anions	Tin(IV) fluoride Tin(IV) chloride Tin(IV) iodide
Other cations	Carbon tetrabromide Silicon tetrabromide Germanium tetrabromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Structure

SnBr₄ crystallises in a monoclinic crystal system with molecular SnBr₄ units that have distorted tetrahedral geometry.^[2] The mean Sn-Br bond length is 242.3 pm.^[3]

Preparation

SnBr₄ can be prepared by reaction of the elements at standard temperature and pressure (STP):^{[4][page needed]}

Sn + 2Br
₂ → SnBr
₄

Reactions

In aqueous solution SnBr₄ dissolves to give a series of octahedral (six-ligated) bromo-aquo complexes. These include SnBr₄(H₂O)₂ and cis- and trans-[SnBr₂(H₂O)₄]²⁺.^[5]

SnBr₄ forms 1:1 and 1:2 complexes with ligands. With trimethylphosphine both SnBr₄·P(CH₃)₃ and SnBr₄·2P(CH₃)₃.^[6]

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.^[7]