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[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

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. ↑ 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.
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

* v
* t
* e

Bromine compounds

* AgBr
* AlBr3
* AmBr3
* AsBr3
* AuBr3
* BBr3
* B2Br4
* BaBr2
* BeBr2
* BiBr3
* BrCl
* CsBr
* BrF3
* BrF5
* HBr
* IBr
* KBr
* LiBr
* BrN3
* NaBr
* BrO2
* RbBr
* TlBr
* CaBr2
* CdBr2
* CoBr2
* CuBr2
* EuBr2
* FeBr2
* GeBr2
* HgBr2
* Hg2Br2
* MgBr2
* MnBr2
* NiBr2
* Br2O
* Br2O3
* Br2O5
* PbBr2
* PdBr2
* PtBr2
* RaBr2
* S2Br2
* Se2Br2
* SnBr2
* SrBr2
* TeBr2
* YbBr2
* ZnBr2
* CeBr3
* CrBr3
* CsBr3
* DyBr3
* ErBr3
* EuBr3
* FeBr3
* GaBr3
* GdBr3
* HoBr3
* InBr
* InBr3
* IrBr3
* LaBr3
* LuBr3
* MoBr3
* NBr3
* NdBr3
* PBr3
* PrBr3
* ReBr3
* SbBr3
* SmBr3
* TbBr3
* TmBr3
* UBr3
* VBr3
* YBr3
* YbBr3
* GeBr4
* HfBr4
* PbBr4
* SeBr4
* SiBr4
* SnBr4
* TeBr4
* ThBr4
* TiBr4
* UBr4
* WBr4
* ZrBr4
* NbBr5
* PBr5
* TaBr5
* UBr5
* WBr5
* CBr4
* CrBr2
* DyBr2
* HfBr2
* HfBr3

Chemical formulas

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*[CID]: Compound ID
*[H301]: Toxic if swallowed
*[H311]: Toxic in contact with skin
*[H314]: Causes severe skin burns and eye damage
*[H331]: Toxic if inhaled
*[H351]: Suspected of causing cancer
*[H373]: May cause damage to organs through prolonged or repeated exposure
*[H410]: Very toxic to aquatic life with long lasting effects
*[P201]: Obtain special instructions before use
*[P202]: Do not handle until all safety precautions have been read and understood
*[P260]: Do not breathe dust/fume/gas/mist/vapours/spray
*[P261]: Avoid breathing dust/fume/gas/mist/vapours/spray
*[P264]: Wash … thoroughly after handling
*[P270]: Do not eat, drink or smoke when using this product
*[P271]: Use only outdoors or in a well-ventilated area
*[P273]: Avoid release to the environment
*[P280]: Wear protective gloves/protective clothing/eye protection/face protection
*[P281]: Use personal protective equipment as required
*[P301+310]: IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
*[P301+330+331]: IF SWALLOWED: Rinse mouth. Do NOT induce vomiting
*[P302+352]: IF ON SKIN: Wash with soap and water
*[P303+361+353]: IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower
*[P304+340]: IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
*[P305+351+338]: IF IN EYES: Rinse continuously with water for several minutes. Remove contact lenses if present and easy to do – continue rinsing
*[P308+313]: IF exposed or concerned: Get medical advice/attention
*[P310]: Immediately call a POISON CENTER or doctor/physician
*[P311]: Call a POISON CENTER or doctor/physician
*[P312]: Call a POISON CENTER or doctor/physician if you feel unwell
*[P314]: Get Medical advice/attention if you feel unwell
*[P321]: Specific treatment (see … on this label)
*[P322]: Specific measures (see … on this label)
*[P330]: Rinse mouth
*[P361]: Remove/Take off immediately all contaminated clothing
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