Basic information Occurrence and Uses Physical Properties Preparation Safety Supplier Related
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Magnesium bromide

Basic information Occurrence and Uses Physical Properties Preparation Safety Supplier Related

Magnesium bromide Basic information

Product Name:
Magnesium bromide
Synonyms:
  • MAGNESIUM BROMIDE, ANHYDROUS, POWDER, 99 .995%
  • MAGNESIUM BROMIDE ANHYDROUS 98%
  • finechemical
  • Magnesiumbromide,anhydrous,98%
  • Magnesiumbromid
  • Hydrobromic acid magnesium salt
  • Magnesium bromide (MgBr2)
  • magnesiumbromide(mgbr2)
CAS:
7789-48-2
MF:
Br2Mg
MW:
184.11
EINECS:
232-170-9
Product Categories:
  • Chemical Synthesis
  • Crystal Grade Inorganics
  • Inorganic Salts
  • Magnesium
  • Magnesium Salts
  • Materials Science
  • Inorganic Salts
  • Magnesium Salts
  • MagnesiumMetal and Ceramic Science
  • Salts
  • Synthetic Reagents
  • Crystal Grade Inorganics
  • Metal and Ceramic Science
  • Synthetic Reagents
  • Inorganics
  • metal halide
Mol File:
7789-48-2.mol
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Magnesium bromide Chemical Properties

Melting point:
711 °C (lit.)
Boiling point:
1248.47°C (estimate)
Density 
3.72 g/mL at 25 °C (lit.)
form 
Powder
color 
off-white
Specific Gravity
3.72
Water Solubility 
g/100g H2O: 100.6 (25°C), 125.4 (100°C); solid phase, MgBr2 ·6H2O [KRU93]
Merck 
13,5681
Stability:
hygroscopic
CAS DataBase Reference
7789-48-2(CAS DataBase Reference)
NIST Chemistry Reference
Magnesium dibromide(7789-48-2)
EPA Substance Registry System
Magnesium bromide (MgBr2) (7789-48-2)
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Safety Information

Hazard Codes 
Xi
Risk Statements 
36/37/38
Safety Statements 
26-36
WGK Germany 
1
HS Code 
28275900

MSDS

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Magnesium bromide Usage And Synthesis

Occurrence and Uses

Magnesium bromide occurs in sea water, surface and subterranean brines, and salt deposits. It is an electrolyte component in certain dry cells. In medicine, it is a sedative and anticonvulsant for treatment of nervous disorder. It also is used in organic synthesis forming several addition compounds.

Physical Properties

The anhydrous MgBr2 is a white crystalline substance; hexagonal crystals; deliquescent; density 3.72 g/cm3; melts at 700°C; highly soluble in water (101.5g/100mL at 20°C); moderately soluble in methanol and ethanol (21.8 and 6.9 g/mL at 20°C, respectively).
The hexahydrate, MgBr2•6H2O consists of colorless monoclinic crystals; bitter taste; hygroscopic; fluoresce in x-rays; density 2.07 g/cm3; melts at 172.4°C; intensely soluble in water, 316 g/100 mL at 0°C; dissolves in methanol and ethanol; slightly soluble in ammonia solution.

Preparation

Magnesium bromide is prepared by treating magnesium oxide with hydrobromic acid and subsequent crystallization above 0°C. The product is hexahydrate, MgBr2•6H2O:
MgO + 2HBr → MgBr2 + H2O
The anhydrous MgBr2 may be obtained by heating the hexahydrate with dry hydrogen bromide gas. Magnesium bromide also can be made from its elements. Heating magnesium metal with bromine vapor yields the salt:
Mg + Br2 → MgBr2
Magnesium bromide, like the chloride salt, is obtained from sea water (see Magnesium and Magnesium chloride). In this process, magnesium hydroxide precipitated from sea water is neutralized with hydrobromic acid, and MgBr2 is obtained by crystallization.

Chemical Properties

Magnesium Bromide is a white solid, soluble, formed by reaction of magnesium carbonate and hydrobromic acid.

Chemical Properties

Colorless, very deliquescent crystals; bitter taste. Soluble in water; slightly soluble in alcohol.

Occurrence

Magnesium bromide is found in seawater, some mineral springs, natural brines, inland seas and lakes such as the Dead Sea and the Great Salt Lake, and salt deposits such as the Stassfurt deposits. In seawater, it is the primary source of bromine. By the action of chlorine gas upon seawater or seawater bitterns, bromine is formed.

Uses

The major use of MgBr2 has been in the commercial production of bromine. The Dow process is an electrolytic method of bromine extraction from brine, and was Herbert Dow’s second revolutionary process for generating bromine commercially (1889).
Magnesium bromide has also been used in organic syntheses. An efficient and environmentally friendly procedure for the one-pot synthesis of tetrahydropyrimidines from aldehydes, a-diketones and urea/thiourea by using magnesium bromide as an inexpensive and easily available catalyst under solvent-free conditions has been described. Compared with the classical Biginelli reaction conditions, this new method has the advantage of good to excellent yields (74%–94%) and short reaction times (45–90 min). The structure of the Biginelli reaction product from a-diketone, salicylaldehyde and urea has been proposed to possess an oxygen bridge by cyclization (intramolecular Michael addition).

Uses

Organic syntheses, medicine (sedative).

Preparation

Magnesium bromide is prepared by treating MgO with hydrobromic acid and then crystallization above 0.0°C in solution. The product is the hexahydrate salt:
MgO+2HBr→MgBr2+H2O→MgBr2·6H2O
The anhydrous form may also be prepared by heating the hexahydrate with dry HBr gas. This compound can also be formed directly from the elements:
Mg+Br2→MgBr2

Purification Methods

Crystallise it from EtOH or H2O (3.3g/mL). Dry it in a vacuum at ~150o, or heat the hydrate in a stream of HCl. It is very deliquescent. [Ehrlich in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 909 1963.]

Magnesium bromide Preparation Products And Raw materials

Preparation Products

Raw materials

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