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Beryllium bromide
Chemical compound From Wikipedia, the free encyclopedia
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Beryllium bromide is the chemical compound with the formula BeBr2. It is very hygroscopic and dissolves well in water. The Be2+ cation, which is relevant to BeBr2, is characterized by the highest known charge density (Z/r = 6.45), making it one of the hardest cations and a very strong Lewis acid.[3]
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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
When the oxidation is conducted on an ether suspension, one obtains colorless dietherate:[4]
- Be + Br2 + 2 O(C2H5)2 → BeBr2(O(C2H5)2)2
The same dietherate is obtained by suspending beryllium dibromide in diethyl ether:[5]
- BeBr2 2 O(C2H5)2 → BeBr2(O(C2H5)2)2
This ether ligand can be displaced by other Lewis bases.is ether ligand can be displaced by other Lewis bases.
Beryllium bromide hydrolyzes slowly in water: BeBr2 + 2 H2O → 2 HBr + Be(OH)2
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Structure
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.[6][7]
Safety
Beryllium compounds are toxic if inhaled or ingested.
References
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