Beryllium bromide

Structural formula
General
Surname	Beryllium bromide
Molecular formula	BeBr 2
Brief description	white odorless powder
External identifiers / databases
CAS number 7787-46-4 EC number 232-115-9 ECHA InfoCard 100.029.196 PubChem 82230 Wikidata Q420768
properties
Molar mass	168.82 g · mol -1
Physical state	firmly
density	3.465 g cm −3 (20 ° C)
Melting point	506-509  ° C sublimed at 473 ° C
boiling point	520 ° C
solubility	water soluble soluble in ethanol
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary danger H and P phrases H: 350i-330-301-372-319-335-315-317-411 P: 260-301 + 310-304 + 340-305 + 351 + 338-320-330-405-501
Thermodynamic properties
ΔH f 0	−353.5 kJ / mol
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Beryllium bromide is the beryllium salt of hydrobromic acid .

Manufacturing

Beryllium bromide is produced by the action of gaseous bromine on a mixture of beryllium oxide and carbon at 1100 to 1200 ° C. This releases carbon monoxide .

${\displaystyle \mathrm {BeO+Br_{2}+C\ {\xrightarrow {\text{1400 K}}}\ BeBr_{2}+CO\uparrow } }$

It can also be made from the elements or from beryllium carbide and elemental bromine at 500-700 ° C.

${\displaystyle \mathrm {Be+Br_{2}\ {\xrightarrow {\text{800 K}}}\ BeBr_{2}} }$

The reaction of beryllium oxide and hydrogen bromide is also possible.

${\displaystyle \mathrm {BeO+2\ HBr\longrightarrow BeBr_{2}+H_{2}O} }$

properties

Beryllium bromide is a very hygroscopic white powder that crystallizes in the orthorhombic system . The lattice parameters are a = 10.32  Å , b = 5.52 Å and c = 5.54 Å. Its melting enthalpy is 9.80  kJ / mol. In the vapor phase it exists as a dimer .

Individual evidence

1. ↑ ^{a b c d e f} data sheet beryllium bromide from AlfaAesar, accessed on May 28, 2010 ( PDF )(JavaScript required) .
2. ↑ ^{a b c d} Dale L. Perry: Handbook of Inorganic Compounds. CRC Press, 1995, ISBN 978-0-849-38671-8 , p. 61 ( limited preview in Google book search).
3. ^ ^{A b} C. L. Parsons: "The Chemistry and Literature of Beryllium", Chemical Publishing (1909). Full text
4. ↑ Entry for CAS no. 7787-46-4 in the GESTIS substance database of the IFA , accessed on February 1, 2016 (JavaScript required)
5. ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the indicated labeling it falls under the group entry beryllium compounds with the exception of aluminum beryllium silicates, and with those specified elsewhere in this Annex in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
6. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-6.
7. ^ ^{A b c d} Kenneth A. Walsh: "Beryllium chemistry and Processing", ASM International (2009). P. 120f. ( limited preview in Google Book search)