Selenium tetrabromide

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

Selenium tetrabromide
Names
IUPAC name
Tetrabromo-λ4-selane
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.256
EC Number
  • 232-181-9
UNII
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 pictograms
GHS Signal word Danger
H301, H311, H314, H331, H351, H373, H400, H410
P201, P202, P260, P261, P264, P270, P271, P273, P280, P281, P301+310, P301+330+331, P302+352, P303+361+353, P304+340, P305+351+338, P308+313, P310, P311, P312, P314, P321, P322, P330, P361
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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. Born, Ref. P.; Kniep, R.; Mootz, D. (1979). "Phasenbeziehungen im System Se-Br und die Kristallstrukturen des dimorphen SeBr4". Z. Anorg. Allg. Chem. 451 (1): 12–24. doi:10.1002/zaac.19794510103.
  2. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 772–774. ISBN 978-0-08-037941-8.
  3. Tideswell, N. W.; McCullough, J. D. (1956). "Selenium Bromides. I. A Spectrophotometric Study of the Dissociation of Selenium Tetrabromide and Selenium Dibromide in Carbon Tetrachloride Solution1,2". Journal of the American Chemical Society. 78 (13): 3026–3029. doi:10.1021/ja01594a025.
  4. Perry, Dale L. (2011). Handbook of Inorganic Compounds. CRC Press. p. 360. ISBN 978-1-4398-1461-1.
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