Beryllium bromide

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title: "Beryllium bromide" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["beryllium-compounds", "bromides", "alkaline-earth-metal-halides", "inorganic-polymers"] topic_path: "science/chemistry" source: "https://en.wikipedia.org/wiki/Beryllium_bromide" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

| Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 459960826 | ImageFile = Beryllium bromide.svg | ImageSize = 250px | ImageFile1 = Beta-Beryllium iodide.png | ImageSize1 = 250px | ImageFile2 = Alpha-Beryllium iodide.png | ImageSize2 = 250px | IUPACName = Beryllium bromide |Section1={{Chembox Identifiers | ChemSpiderID_Ref = | ChemSpiderID = 74208 | InChIKey = PBKYCFJFZMEFRS-NUQVWONBAJ | CASNo_Ref = | CASNo = 7787-46-4 | EINECS = 232-115-9 | StdInChI_Ref = | StdInChI = 1S/Be.2BrH/h;21H/q+2;;/p-2 | StdInChIKey_Ref = | StdInChIKey = PBKYCFJFZMEFRS-UHFFFAOYSA-L | PubChem = 82230 | SMILES = BrBe-2([Br+]1)[Br+][Be-2]1([Br+]1)[Br+][Be-2]1([Br+]1)[Br+][Be-2]1([Br+]1)[Br+][Be-2]1([Br+]1)[Br+][Be-2]1([Br+]1)[Br+][Be-2]1([Br+]1)[Br+][Be-2]1([Br+]1)[Br+][Be-2]1([Br+]1)[Br+][Be-2]1([Br+]1)[Br+][Be-2]1([Br+]1)[Br+][Be-2]1([Br+]1)[Br+][Be-2]1(Br)Br | InChI = 1/Be.2BrH/h;21H/q+2;;/p-2 | UNII = T00751H2J8 |Section2={{Chembox Properties | Formula = BeBr2 | MolarMass = 168.820 g/mol | Appearance = colorless white crystals | Density = 3.465 g/cm3 (20 °C) | MeltingPtC = 508 | MeltingPt_ref = sublimes at 473 C | BoilingPtC = 520 | BoilingPt_ref = | last1 = Perry | first1 =Dale L. | last2 =Phillips | first2 =Sidney L. | year =1995 | title =Handbook of Inorganic Compounds | publisher =CRC Press | pages =61–62 | isbn =0-8493-8671-3 | url= https://books.google.com/books?id=0fT4wfhF1AsC&q=%22beryllium+bromide%22+properties&pg=PA61 | access-date = 2007-12-10 | Solubility = Highly | SolubleOther = soluble in ethanol, diethyl ether, pyridine insoluble in benzene |Section3={{Chembox Structure | CrystalStruct = Orthorhombic |Section4={{Chembox Thermochemistry | DeltaHf = −2.094 kJ/g | Entropy = 9.5395 J/K | HeatCapacity = 0.4111 J/g K |Section7={{Chembox Hazards | MainHazards = see Berylliosis | NFPA-H = 4 | NFPA-F = 0 | NFPA-R = 0 | GHSPictograms = | GHSSignalWord = Danger | HPhrases = | PPhrases = | REL = Ca C 0.0005 mg/m3 (as Be) | PEL = TWA 0.002 mg/m3 C 0.005 mg/m3 (30 minutes), with a maximum peak of 0.025 mg/m3 (as Be) | IDLH = Ca [4 mg/m3 (as Be)]}} |Section8={{Chembox Related | OtherAnions = Beryllium fluoride Beryllium chloride Beryllium iodide | OtherCations = Magnesium bromide Calcium bromide Strontium bromide Barium bromide Radium bromide

Beryllium bromide is the chemical compound with the formula BeBr2. It is very hygroscopic and dissolves well in water. The 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.

Preparation and reactions

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

When the oxidation is conducted on an ether suspension, one obtains colorless dietherate: : The same dietherate is obtained by suspending beryllium dibromide in diethyl ether: :

This ether ligand can be displaced by other Lewis bases

Beryllium bromide hydrolyzes slowly in water:

BeBr2 + 2 H2O → 2 HBr + Be(OH)2

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.

Safety

Beryllium compounds are toxic if inhaled or ingested.

References

References

  1. {{PGCH. 0054
  2. Buchner, M. R.. (2017-01-01). "Beryllium Chemistry". Elsevier.
  3. (2019-02-01). "Beryllium Halide Complexes Incorporating Neutral or Anionic Ligands: Potential Precursors for Beryllium Chemistry". Chemistry: An Asian Journal.
  4. (2019-02-01). "Beryllium Halide Complexes Incorporating Neutral or Anionic Ligands: Potential Precursors for Beryllium Chemistry". Chemistry: An Asian Journal.
  5. (2020). "A Second Modification of Beryllium Bromide: β-BeBr2". Inorganic Chemistry.
  6. Troyanov, S. I.. (2000). "Crystal Modifications of Beryllium Dihalides BeCl2, BeBr2, and BeI2". Zhurnal Neorganicheskoi Khimii.

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beryllium-compoundsbromidesalkaline-earth-metal-halidesinorganic-polymers