Cobalt(II) bromide

Cobalt(II) bromide
Identifiers
CAS number 7789-43-7 YesY
PubChem 24610
ChemSpider 23012 YesY
RTECS number GF9595000
Jmol-3D images Image 1
Properties
Molecular formula CoBr2, CoBr2.6H2O, CoBr2.2H2O
Molar mass 218.74 g/mol
Appearance Green powder
Density 4.909 g/cm3
Melting point

678 °C

Solubility in water 112 g/100 mL
Structure
Crystal structure Rhombohedral, hP3, SpaceGroup = P-3m1, No. 164
Coordination
geometry
octahedral
Hazards
MSDS Fisher Scientific
EU Index Not listed
R-phrases R36, R37, R38
S-phrases S26, S37, S39, S45, S28A
NFPA 704
NFPA 704.svg
0
2
1
Flash point Non-flammable
LD50 406 mg/kg
Related compounds
Other anions cobalt(II) fluoride
cobalt(II) chloride
cobalt(II) iodide
Other cations iron(II) bromide
nickel(II) bromide
 YesY bromide (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Cobalt(II) bromide (CoBr2) is an inorganic compound used primarily as a catalyst in some processes.

Contents

Properties

When anhydrous, cobalt(II) bromide appears as green crystals. The hexahydrate loses four waters of crystallization molecules at 100°C forming the dihydrate:

CoBr2.6H2O → CoBr2.2H2O + 4H2O

Further heating to 130°C Produces the anhydrous form:

CoBr2.4H2O → CoBr2

The anhydrous form will then melts at 678°C.[1][2] At higher temperatures, cobalt(II) bromide reacts with oxygen, forming cobalt(II,III) oxide and bromine vapor.

Preparation

Cobalt(II) bromide can be prepared as a hydrate by the reaction of cobalt hydroxide with hydrobromic acid:

Co(OH)2(s) + 2HBr(aq) → CoBr2.6H2O(aq)

Anhydrous cobalt(II) bromide may be prepared through the direct reaction of elemental cobalt and liquid bromine.[3][4][5]

Uses

Cobalt(II) bromide may be used as a catalyst in the oxidation of some organic compounds with cobalt(III).[6]

Health issues

Exposure to large amounts of cobalt(II) can cause cobalt poisoning.[7] Bromide is also mildly toxic.

References


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Look at other dictionaries:

  • cobalt(II) bromide — kobalto(II) bromidas statusas T sritis chemija formulė CoBr₂ atitikmenys: angl. cobalt(II) bromide; cobaltous bromide rus. кобальт бромистый; кобальта(II) бромид ryšiai: sinonimas – kobalto dibromidas …   Chemijos terminų aiškinamasis žodynas

  • Cobalt(II) chloride — Anhydrous Hexahydrate …   Wikipedia

  • Cobalt(II) hydroxide — Cobalt(II) hydroxide …   Wikipedia

  • Cobalt(II) iodide — IUPAC name Cobalt(II) iodide Other names cobaltous iodide …   Wikipedia

  • Cobalt — This article is about the metal. For other uses, see Cobalt (disambiguation). iron ← cobalt → nickel ↑ Co ↓ Rh …   Wikipedia

  • Cobalt(III) hexammine chloride — Chembox new Name = Cobalt(III) hexammine chloride ImageFile = CoA6Cl3.png ImageName = IUPACName = Hexaamminecobalt(III) chloride OtherNames = Cobalt hexammine chloride Section1 = Chembox Identifiers CASNo = 10534 89 1 RTECS = Section2 = Chembox… …   Wikipedia

  • Nickel(II) bromide — Nickel(II) bromide …   Wikipedia

  • Manganese(II) bromide — Manganese(II) bromide …   Wikipedia

  • cobaltous bromide — kobalto(II) bromidas statusas T sritis chemija formulė CoBr₂ atitikmenys: angl. cobalt(II) bromide; cobaltous bromide rus. кобальт бромистый; кобальта(II) бромид ryšiai: sinonimas – kobalto dibromidas …   Chemijos terminų aiškinamasis žodynas

  • Dictionary of chemical formulas — This is a list of chemical compounds with chemical formulas and CAS numbers, indexed by formula. This complements alternative listings to be found at list of inorganic compounds, list of organic compounds and inorganic compounds by element. Table …   Wikipedia


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