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Magnesium bromide

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CAS:7789-48-2
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CAS:7789-48-2
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Magnesium bromide Basic information
Occurrence and Uses Physical Properties Preparation
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
Magnesium bromide Structure
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 Gravity3.72
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 Reference7789-48-2(CAS DataBase Reference)
NIST Chemistry ReferenceMagnesium dibromide(7789-48-2)
EPA Substance Registry SystemMagnesium bromide (MgBr2) (7789-48-2)
Safety Information
Hazard Codes Xi
Risk Statements 36/37/38
Safety Statements 26-36
WGK Germany 1
HS Code 28275900
MSDS Information
ProviderLanguage
Magnesium bromide English
SigmaAldrich English
Magnesium bromide Usage And Synthesis
Occurrence and UsesMagnesium 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 PropertiesThe 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.
PreparationMagnesium 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 PropertiesMagnesium Bromide is a white solid, soluble, formed by reaction of magnesium carbonate and hydrobromic acid.
Chemical PropertiesColorless, very deliquescent crystals; bitter taste. Soluble in water; slightly soluble in alcohol.
OccurrenceMagnesium 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.
UsesThe 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).
UsesOrganic syntheses, medicine (sedative).
PreparationMagnesium 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 MethodsCrystallise 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
Raw materialsGovernment regulation-->Dimethoate-->Magnesium hydroxide
Preparation ProductsGovernment regulation-->DIMETHYL METHOXYMALONATE
Tag:Magnesium bromide(7789-48-2) Related Product Information
Magnesium bromide IRON (III) BROMIDE Cupric bromide NICKEL(II) BROMIDE 2-METHOXYETHYL ETHER& Rhodium tribromide TITANIUM(IV) BROMIDE IRON (II) BROMIDE Lithium Bromide hydrate GOLD(III) BROMIDE NICKEL BROMATE Sodium bromide Zinc bromide LEAD(II) BROMIDE CERIUM(III)BROMIDE HEXAHYDRATE MAGNESIUM BROMIDE ETHYL ETHERATE,MAGNESIUM BROMIDE DIETHYL ETHERATE (-)-[(R)-2-Methylbutyl] magnesium bromide (1-Methylethenyl)magnesium bromide (1H-Indole-1-yl) magnesium bromide