A | B | C | D | E | F | G | H | CH | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
Names | |
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IUPAC name
Beryllium bromide
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.029.196 |
EC Number |
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PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
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] |
Highly[1] | |
Solubility | soluble in ethanol, diethyl ether, pyridine insoluble in benzene |
Structure | |
Orthorhombic | |
Thermochemistry | |
Heat capacity (C)
|
0.4111 J/g K |
Std molar
entropy (S⦵298) |
9.5395 J/K |
Std enthalpy of
formation (ΔfH⦵298) |
-2.094 kJ/g |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
|
see Berylliosis |
GHS labelling: | |
Danger | |
H301, H315, H317, H319, H330, H335, H350i, H372, H411 | |
P260, P301+P310, P304+P340, P305+P351+P338, P320, P330, P405, P501 | |
NFPA 704 (fire diamond) | |
NIOSH (US health exposure limits): | |
PEL (Permissible)
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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)
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Ca C 0.0005 mg/m3 (as Be)[2] |
IDLH (Immediate danger)
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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).
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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 coordinated Be centres.[3]
Preparation and reactionsedit
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 hydrolyzes slowly in water: BeBr2 + 2 H2O → 2 HBr + Be(OH)2
Structureedit
Two forms (polymorphs) of BeBr2 are known. Both structures consist of tetrahedral Be2+ centers interconnected by doubly bridging bromide ligands. One form consist of edge-sharing polytetrahedra. The other form resembles zinc iodide with interconnected adamantane-like cages.[4]
Safetyedit
Beryllium compounds are toxic if inhaled or ingested.
Referencesedit
- ^ a b c 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
- ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0054". National Institute for Occupational Safety and Health (NIOSH).
- ^ Crystal modifications of Beryllium dihalides BeCl2, BeBr2, and BeI2 Troyanov, S. I. Zhurnal Neorganicheskoi Khimii (2000), 45(10), 1619-1624.
- ^ Buchner, Magnus R.; Dankert, Fabian; Spang, Nils; Pielnhofer, Florian; von Hänisch, Carsten (2020). "A Second Modification of Beryllium Bromide: β-BeBr2". Inorganic Chemistry. 59 (23): 16783–16788. doi:10.1021/acs.inorgchem.0c02832. PMID 33185106. S2CID 226850424.
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