Tin(IV) bromide

Chembox new
ImageFile =
ImageSize =
IUPACName = tetrabromostannane
OtherNames = tin tetrabromide, stannic bromide, bromostannic acid
Section1 = Chembox Identifiers
CASNo = 7789-67-5
PubChem =
SMILES =
Section2 = Chembox Properties
Formula = SnBr₄
MolarMass = 438.33 g/mol
Appearance = colourless Greenwood&Earnshaw]
Density = 3.340 g/cm³ (at 35 °C)
MeltingPt = 31 °C
BoilingPt = 205 °C
Solubility =
Section3 = Chembox Hazards
MainHazards =
FlashPt =
Autoignition =

Tin(IV) bromide is the chemical compound SnBr₄. It is a colourless low melting solid. SnBr₄ can be prepared by reaction of the elements at normal temperatures:Egon Wiberg, Arnold Frederick Holleman (2001) "Inorganic Chemistry", Elsevier ISBN 0123526515] :Sn + 2Br₂ → SnBr₄In aqueous solution Sn(H₂O)₆⁴⁺ is the principal ionic species amongst a range of 6 coordinate ions with from 0-6 bromide ligands (e.g. Sn(H₂O)₆⁴⁺, SnBr(H₂O)₅³⁺ etc.Sn NMR and vibrational spectroscopy, Taylor M. J. ; Coddington J. M., Polyhedron 1992, 11, 12, 1531-1544, doi|10.1016/S0277-5387(00)83148-4] . In basic solution the Sn(OH)₆²⁻ ion is present.
SnBr₄ forms 1:1 and 1:2 complexes with ligands, e.g. with trimethylphosphine the following can be produced, SnBr₄.P(CH₄)₃ and SnBr₄.2P(CH₄)₃. [Preparation, Infrared and Raman Spectra, and Stereochemistries of Pentacoordinate Trimethylphosphine Complexes, MX₄•P(CH₃)₃ and MX₄•P(CD₃)₃ where M = Ge or Sn and X = Cl or Br, Frieson D. K., Ozin G. A., Can. J. Chem. 51(16): 2697–2709 (1973) doi|10.1139/v73-406]
SnBr₄ crystallises in a monoclinic form with molecular SnBr₄ units that have distorted tetrahedral geometry. [Die Kristallstruktur von SnBr₄ , Brand P., Sackmann H., Acta Crystallographica ( 1963), 16, 446-451, doi|10.1107/S0365110X63001250]

References