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| Names | |
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| IUPAC name
Tetrabromo-λ4-selane
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| Other names
Selenium tetrabromide, selenium(IV) bromide
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.029.256 |
| EC Number |
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PubChem CID
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| UNII | |
CompTox Dashboard (EPA)
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| 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) |
| Structure1 | |
| trigonal (α) monoclinic (β) | |
| P31c, No. 159 (α) C2/c, No.15 (β) | |
Formula units (Z)
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16 |
| Hazards | |
| GHS labelling: | |
   
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| Danger | |
| H301, H311, H314, H331, H351, H373, H410 | |
| P201, P202, P260, 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
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Selenium tetrafluoride Selenium tetrachloride |
Other cations
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Tellurium tetrabromide |
Related compounds
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Selenium dibromide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Selenium tetrabromide is an inorganic compound with a chemical formula SeBr4.
Preparation
Selenium tetrabromide could be produced by mixing elemental bromine and selenium:23
- Se + 2Br2 → SeBr4
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
- 2SeBr4 → Se2Br2 + 3Br2
References
References
- 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. doi:10.1016/C2009-0-30414-6. ISBN 978-0-08-037941-8.
- 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.