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Beryllium bromide

Chemical compound From Wikipedia, the free encyclopedia

Beryllium bromide
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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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