Antimony tribromide

Antimony tribromide

200px
Names
IUPAC name tribromostibane
Other names Antimony(III) bromide
Identifiers
CAS Number	7789-61-9 N
ChemSpider	23017 Y
EC Number	232-179-8
Jmol 3D model	Interactive image Interactive image
PubChem	24615
RTECS number	CC4400000
InChI InChI=1S/3BrH.Sb/h3*1H;/q;;;+3/p-3 Y Key: RPJGYLSSECYURW-UHFFFAOYSA-K Y InChI=1/3BrH.Sb.3H/h3*1H;;;;/q;;;+3;;;/p-3/r3BrH.H3Sb/h3*1H;1H3/q;;;+3/p-3 Key: BJUAQAQGPWXYGO-DAEPFFQNAU InChI=1/3BrH.Sb/h3*1H;/q;;;+3/p-3 Key: RPJGYLSSECYURW-DFZHHIFOAI
SMILES [Br-].[Br-].[Br-].[SbH3+3] Br[Sb](Br)Br
Properties
Chemical formula	SbBr3
Molar mass	361.472 g/mol
Appearance	colorless to yellow crystals hygroscopic
Density	4.35 g/cm3
Melting point	96.6 °C (205.9 °F; 369.8 K)
Boiling point	288 °C (550 °F; 561 K)
Solubility in water	reacts
Solubility	soluble in dilute HCl, HBr, CS2, acetone, benzene, chloroform, ammonia, alcohol
Refractive index (nD)	1.74
Dipole moment	2.47 D
Structure
Crystal structure	Orthorhombic, oP16, SpaceGroup = Pnma, No. 62 (β form)
Thermochemistry
Specific heat capacity (C)	96 J/mol K
Std enthalpy of formation (ΔfHo298)	-259 kJ/mol
Vapor pressure	{{{value}}}
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

Antimony tribromide (SbBr₃) is a chemical compound containing antimony in its +3 oxidation state.

Production

It may be made by the reaction of antimony with elemental bromine, or by the reaction of antimony trioxide with hydrobromic acid.

Alternatively, it can be prepared by the action of bromine on a mixture of antimony sulfide and antimony trioxide at 250 °C.

Uses

It can be added to polymers such as polyethylene as a fire retardant. It is also used in the production of other antimony compounds, in chemical analysis, as a mordant, and in dyeing.

Chemical Properties

Antimony tribromide has two crystalline forms, both having orthorhombic symmetries. When a warm carbon disulfide solution of SbBr₃ is rapidly cooled, it crystallizes into the needle-like α-SbBr₃, which then slowly converts to the more stable β form.

Antimony tribromide hydrolyzes in water to form hydrobromic acid and antimony trioxide:

2 SbBr₃ + 3 H₂O → Sb₂O₃ + 6 HBr