Selenium Tetrabromide

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;
EC Number	232-181-9;
PubChem CID	82246;
UNII	8O54YXR180;
	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 pictograms
GHS Signal word	Danger
GHS hazard statements	H301, H311, H314, H331, H351, H373, H410
GHS precautionary statements	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
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]

[math]\displaystyle{ \rm \ Se + 2Br_2 \rightarrow SeBr_4 }[/math]

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]

[math]\displaystyle{ \rm \ 2SeBr_4 \rightarrow Se_2Br_2 + 3Br_2 }[/math]

References

↑ ^1.0 ^1.1 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. https://onlinelibrary.wiley.com/doi/abs/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.
↑ ^3.0 ^3.1 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. pp. 360. ISBN 978-1-4398-1461-1.

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[Born1979-1] 1.0 ^1.1 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. https://onlinelibrary.wiley.com/doi/abs/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] 3.0 ^3.1 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. pp. 360. ISBN 978-1-4398-1461-1.

v t e Selenium compounds
Se(−II)	Ag₂Se Al₂Se₃ CaSe Se²⁻
Se(0,I)	Se₃S₅
Se(I)	Se₂S₆ Se₂Cl₂ C₃H₇NO₂Se
Se(II)	SeS₂
Se(IV)	SeCl₄ SeF₄ SeO₂ SeS₂ SeOBr₂ SeOCl₂
Se(VI)	SeF₆ SeO₃ SeO₂F₂

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
EC Number	232-181-9
PubChem CID	82246
UNII	8O54YXR180
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^[1]
Crystal structure	trigonal (α) monoclinic (β)
Space group	P31c, No. 159 (α) C2/c, No.15 (β)
Formula units (Z)	16
Hazards
GHS pictograms
GHS Signal word	Danger
GHS hazard statements	H301, H311, H314, H331, H351, H373, H410
GHS precautionary statements	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
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