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Selenium tetrabromide
Names
	IUPAC name Tetrabromo-λ4-selane
	Other names Selenium tetrabromide, selenium(IV) bromide
Identifiers
CAS Number	7789-65-3;
3D model (JSmol)	Interactive image;
ChemSpider	74224;
ECHA InfoCard	100.029.256
EC Number	232-181-9;
PubChem CID	82246;
UNII	8O54YXR180;
CompTox Dashboard (EPA)	DTXSID1064871 ;
	InChI 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
Chemical formula	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
Crystal structure	trigonal (α); monoclinic (β)
Space group	P31c, No. 159 (α); C2/c, No.15 (β)
Formula units (Z)	16
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H311, H314, H331, H351, H373, H410
Precautionary statements	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). Infobox references

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]

{\rm {\ Se+2Br_{2}\rightarrow SeBr_{4}}}

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]

{\rm {\ 2SeBr_{4}\rightarrow Se_{2}Br_{2}+3Br_{2}}}

References

^ ^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.
^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 772–774. ISBN 978-0-08-037941-8.
^ ^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.
^ Perry, Dale L. (2011). Handbook of Inorganic Compounds. CRC Press. p. 360. ISBN 978-1-4398-1461-1.

[Born1979-1] 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.

[:0-3] 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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