Beryllium bromide

Beryllium bromide

Names
IUPAC name Beryllium bromide
Identifiers
CAS Number	7787-46-4 N
3D model (Jmol)	Interactive image
ChemSpider	74208 Y
ECHA InfoCard	100.029.196
PubChem	82230
InChI InChI=1S/Be.2BrH/h;2*1H/q+2;;/p-2 Y Key: PBKYCFJFZMEFRS-UHFFFAOYSA-L Y InChI=1/Be.2BrH/h;2*1H/q+2;;/p-2 Key: PBKYCFJFZMEFRS-NUQVWONBAJ
SMILES [Be+2].[Br-].[Br-]
Properties
Chemical formula	BeBr2
Molar mass	168.820 g/mol
Appearance	colorless white crystals
Density	3.465 g/cm3 (20 °C)
Melting point	508 °C (946 °F; 781 K)sublimes at 473 °C (883 °F; 746 K)
Boiling point	520 °C (968 °F; 793 K)[1]
Solubility in water	Highly[1]
Solubility	soluble in ethanol, diethyl ether, pyridine insoluble in benzene
Structure
Crystal structure	Orthorhombic
Thermochemistry
Specific heat capacity (C)	0.4111 J/g K
Std molar entropy (So298)	9.5395 J/K
Std enthalpy of formation (ΔfHo298)	-2.094 kJ/g
Hazards
Main hazards	see Berylliosis
US health exposure limits (NIOSH):
PEL (Permissible)	TWA 0.002 mg/m3 C 0.005 mg/m3 (30 minutes), with a maximum peak of 0.025 mg/m3 (as Be)[2]
REL (Recommended)	Ca C 0.0005 mg/m3 (as Be)[2]
IDLH (Immediate danger)	Ca [4 mg/m3 (as Be)][2]
Related compounds
Other anions	Beryllium fluoride Beryllium chloride Beryllium iodide
Other cations	Magnesium bromide Calcium bromide Strontium bromide Barium bromide Radium bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Beryllium bromide is the chemical compound with the formula BeBr₂. It is very hygroscopic and dissolves well in water. The compound is a polymer with tetrahedral Be centres.^[3]

Preparation and reactions

It can be prepared by reacting beryllium metal with elemental bromine at temperatures of 500 °C to 700 °C:^[1]

Be + Br₂ → BeBr₂

Beryllium bromide is also formed when treating beryllium oxide with hydrobromic acid:

BeO + 2 HBr → BeBr₂ + H₂O

It hydrolizes slowly in water: BeBr₂ + 2 H₂O → 2 HBr + Be(OH)₂

Safety

Beryllium compounds are toxic if inhaled or ingested.

References

1. 1 2 3 Perry, Dale L.; Phillips, Sidney L. (1995), Handbook of Inorganic Compounds, CRC Press, pp. 61–62, ISBN 0-8493-8671-3, retrieved 2007-12-10 
2. 1 2 3 "NIOSH Pocket Guide to Chemical Hazards #0054". National Institute for Occupational Safety and Health (NIOSH). 
3. ↑ Crystal modifications of Beryllium dihalides BeCl2, BeBr2, and BeI2 Troyanov, S. I. Zhurnal Neorganicheskoi Khimii (2000), 45(10), 1619-1624.