Selenium tetrabromide

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Selenium tetrabromide
Names
IUPAC name
Tetrabromo-λ4-selane
Other names
Selenium tetrabromide, selenium(IV) bromide
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.029.256 Edit this at Wikidata
EC Number
  • 232-181-9
UNII
  • InChI=1S/Br4Se/c1-5(2,3)4
    Key: VTQZBGAODFEJOW-UHFFFAOYSA-N
  • InChI=1/Br4Se/c1-5(2,3)4
    Key: VTQZBGAODFEJOW-UHFFFAOYAY
SMILES
  • Br[Se](Br)(Br)Br
Properties
SeBr4
Molar mass 398.576
Density 4.029 g/cm3
Melting point 75 °C (167 °F; 348 K) (dissolves)
Boiling point 115 °C (239 °F; 388 K) (sublimes)
Structure[1]
trigonal (α)
monoclinic (β)
P31c, No. 159 (α)
C2/c, No.15 (β)
16
Hazards
GHS labelling:
GHS05: CorrosiveGHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
Danger
H301, H311, H314, H331, H351, H373, H410
P201, P202, P260, P261, P264, P270, P271, P273, P280, P281, P301+P310, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P308+P313, P310, P311, P312, P314, P321, P322, P330, P361, P363, P391, P403+P233, P405, P501
Related compounds
Other anions
 Selenium tetrafluoride
Selenium tetrachloride
Other cations
 Tellurium tetrabromide
Related compounds
 Selenium dibromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Selenium tetrabromide is an inorganic compound with a chemical formula SeBr4.

Preparation

Selenium tetrabromide could be produced by mixing elemental bromine and selenium:[2][3]

Properties

Selenium tetrabromide exists in two

polymorphs, the trigonal, black α-SeBr4 and the monoclinic, orange-reddish β-SeBr4, both of which feature tetrameric cubane-like Se4Br16 units but differ in how they are arranged.[1] It dissolves in carbon disulfide, chloroform and ethyl bromide, but decomposes in water,[4] so that it produces selenous acid
in wet air.

The compound is only stable under a bromine-saturated atmosphere; gas phase measurements of the gas density indicate that the compound decomposes into selenium monobromide and bromine.[3]

References

  1. ^
    doi:10.1002/zaac.19794510103
    .
  2. ISBN 978-0-08-037941-8
    .
  3. ^
    doi:10.1021/ja01594a025
    .
  4. ISBN 978-1-4398-1461-1
    .
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