Selenium tetrabromide

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Crystal structure
Crystal structure of selenium tetrabromide
__ Se 4+      __ Br -
Se 4 Br 16 unit in the crystal structure of SeBr 4
General
Surname Selenium tetrabromide
other names

Selenium (IV) bromide

Ratio formula SeBr 4
Brief description

yellow ocher solid

External identifiers / databases
CAS number 7789-65-3
EC number 232-181-9
ECHA InfoCard 100.029.256
PubChem 82246
Wikidata Q10925174
properties
Molar mass 398.60 g mol −1
Physical state

firmly

Melting point

70–80 ° C (decomposition)

solubility
safety instructions
GHS labeling of hazardous substances
06 - Toxic or very toxic 08 - Dangerous to health 09 - Dangerous for the environment

danger

H and P phrases H: 301-331-373-410
P: 260-261-301 + 310-321-405-501
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Selenium tetrabromide is an inorganic chemical compound of selenium from the group of bromides .

Extraction and presentation

Selenium tetrabromide can be obtained by reacting selenium with bromine .

properties

Selenium tetrabromide is a hygroscopic, moisture-sensitive ocher yellow solid that decomposes in water via selenium oxybromide to form selenious acid and is soluble in carbon disulfide , chloroform and ethyl bromide . It has an unpleasant odor reminiscent of disulphur dichloride and breaks down in moist air into bromine, diselenium dibromide and selenium , turning brownish red. When heated, the bromine is split off, and between 75 ° C and 80 ° C a mixture of selenium tetrabromide and diselene dibromide sublimes in black, shiny crystals. The compound reacts with ammonia under pressure to form tetraselentetranitride . Its crystal structure is tetrameric and resembles that of Cuban . In concentrated hydrobromic acid it forms hexabromoselenates (IV) with alkali bromides, e.g. B. the red cesium hexachloroselenate (IV) Cs 2 [SeBr 6 ].

Individual evidence

  1. ↑ a b c Georg Brauer (ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 419.
  2. ↑ a b c d e f g Data sheet Selenium (IV) bromide, 99 +% from AlfaAesar, accessed on November 25, 2013 ( PDF )(JavaScript required) .
  3. ^ A b A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 621.
  4. ↑ Balaram Sahoo, Nimain C. Nayak, Asutosh Samantaray, Prafulla K. Pujapanda, Sahoo Balaram, nayak Nimai Charan, samantaray Asutosh, pujapanda Prafulla Kumar: Inorganic Chemistry . 2012, ISBN 978-81-203-4308-5 , pp. 490 ( limited preview in Google Book search).
  5. ↑ Synthesis, characterization and structural-chemical aspects of copper and silver chalcogenohalides as well as halogeno- and oxochalkogenates (IV) , by Cand. Paed. Michael Wagener, University of Siegen 2005.