Strontium bromide

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

| Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 470471188 | ImageFile = Strontium-bromide-xtal-2011-Mercury-3D-balls.png | ImageSize = | IUPACName = Strontium bromide | SystematicName = | OtherNames = |Section1={{Chembox Identifiers | Abbreviations = | ChemSpiderID_Ref = | ChemSpiderID = 23635 | InChI = 1S/2BrH.Sr/h21H;/q;;+2/p-2 | InChIKey = YJPVTCSBVRMESK-NUQVWONBAI | StdInChI_Ref = | StdInChI = 1S/2BrH.Sr/h21H;/q;;+2/p-2 | StdInChIKey_Ref = | StdInChIKey = YJPVTCSBVRMESK-UHFFFAOYSA-L | InChIKey1 = YJPVTCSBVRMESK-UHFFFAOYSA-L | CASNo_Ref = | CASNo = 10476-81-0 | UNII_Ref = | UNII = 1NG558X5VJ | EINECS = 233-969-5 | PubChem = 25302 | SMILES = [Sr+2].[Br-].[Br-] | RTECS = | MeSHName = | ChEBI_Ref = | ChEBI = | KEGG_Ref = | KEGG = |Section2={{Chembox Properties | Formula = | MolarMass = 247.428 g/mol (anhydrous) 355.53 g/mol (hexahydrate) | Appearance = white crystalline powder | Density = 4.216 g/cm3 (anhydrous) 2.386 g/cm3 (hexahydrate) | MeltingPtC = 643 | BoilingPtC = 2146 | BoilingPt_notes = | Solubility = 107 g/100 mL | SolubleOther = Soluble in ethanol Insoluble in diethyl ether | Solvent = | LogP = | VaporPressure = | HenryConstant = | AtmosphericOHRateConstant = | pKa = | pKb = | MagSus = −86.6·10−6 cm3/mol }} |Section3={{Chembox Structure | Structure_ref = | CrystalStruct = Tetragonal | SpaceGroup = P4/n (No. 85) | LattConst_a = 1160.42 pm | LattConst_c = 713.06 pm | UnitCellFormulas = 10 | Coordination = | MolShape = }} |Section4={{Chembox Thermochemistry | DeltaHf = | DeltaHc = | Entropy = | HeatCapacity = }} |Section5={{Chembox Pharmacology | AdminRoutes = | Bioavail = | Metabolism = | HalfLife = | ProteinBound = | Excretion = | Legal_status = | Legal_US = | Legal_UK = | Legal_AU = | Legal_CA = | Pregnancy_category = | Pregnancy_AU = | Pregnancy_US = }} |Section6={{Chembox Explosive | ShockSens = | FrictionSens = | DetonationV = | REFactor = }} |Section7={{Chembox Hazards | MainHazards = Corrosive | NFPA-H = 1 | NFPA-F = 0 | NFPA-R = 1 | NFPA-S = | FlashPt = | AutoignitionPt = | ExploLimits = | LD50 = | PEL = }} |Section8={{Chembox Related | OtherAnions = | OtherCations = | OtherFunction = | OtherFunction_label = | OtherCompounds = Strontium bromide is a chemical compound with a formula . At room temperature it is a white, odourless, crystalline powder. Strontium bromide imparts a bright red colour in a flame test, showing the presence of strontium ions. It is used in flares and also has some pharmaceutical uses.

Preparation

can be prepared from strontium hydroxide and hydrobromic acid. : Alternatively strontium carbonate can also be used as strontium source. : These reactions give hexahydrate of strontium bromide (), which decomposes to dihydrate () at 89 °C. At 180 °C anhydrous is obtained.

Structure

At room temperature, strontium bromide adopts a crystal structure with a tetragonal unit cell and space group P4/n. This structure is referred to as α- and is isostructural with and . The compound's structure was initially erroneously interpreted as being of the type, but this was later corrected.

Around 920 K (650 °C), α- undergoes a first-order solid-solid phase transition to a much less ordered phase, β-, which adopts the cubic fluorite structure. The beta phase of strontium bromide has a much higher ionic conductivity of about 1 S/cm, comparable to that of molten , due to extensive disorder in the bromide sublattice. Strontium bromide melts at 930 K (657 °C).

File:Strontium-bromide-xtal-3D-sf.png|Space-filling model of the packing of and ions in α- File:Strontium-bromide-xtal-Sr1-coordination-view-2-3D-bs-17-25.png|Distorted square antiprismatic coordination geometry of crystallographically independent strontium atom number 1 File:Strontium-bromide-xtal-Sr2-coordination-view-2-3D-bs-17-25.png|Square antiprismatic coordination geometry of strontium number 2 File:Strontium-bromide-xtal-Br1-coordination-3D-bs-17-25.png|Flattened tetrahedral coordination geometry of bromine number 1 File:Strontium-bromide-xtal-Br2-coordination-3D-bs-17-25.png|Distorted tetrahedral coordination geometry of bromine number 2 File:Strontium-bromide-xtal-Br3-coordination-3D-bs-17-25.png|Tetrahedral coordination geometry of bromine number 3 File:Strontium-bromide-xtal-Br4-coordination-3D-bs-17-25.png| Tetrahedral coordination geometry of bromine number 4

References

  • http://www.webelements.com/

References

  1. Dale L. Perry, Sidney L. Phillips: ''Handbook of Inorganic Compounds''. CRC Press, 1995, {{ISBN. 978-0-8493-8671-8, ({{Google books. 0fT4wfhF1AsC
  2. Kamermans, M. A.. (1939-12-01). "The Crystal Structure of SrBr2.". Walter de Gruyter GmbH.
  3. R. L. Sass. (1963). "The crystal structure of strontium bromide". J. Phys. Chem..
  4. (2011). "High temperature crystal structures and superionic properties of SrCl2, SrBr2, BaCl2 and BaBr2". [[Journal of Solid State Chemistry.

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strontium-compoundsbromidesalkaline-earth-metal-halides