Selenium tetrabromide

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Selenium tetrabromide
Selenium tetrabromide.jpg
Selenium-tetrabromide-tetramer-from-alpha-xtal-3D-bs-17.png
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
  • 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[edit]

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

Properties[edit]

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[edit]

  1. ^ a b 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. ^ a b 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.