Apollo Scientific

MgH2 contains 7.66% by weight of hydrogen and has
been studied as a potential hydrogen-storage medium. It
was discovered in 1912, during the pyrolysis of ethyl
magnesium iodide (a Grignard reagent), which produced
small amount of MgH2. In 1951, preparation from the
elements was first reported involving direct hydrogenation
of Mg metal at high pressure and temperature (200 atmospheres, 500°C)with magnesium iodide as a catalyst:
Mg＋H2→MgH2
Lower temperature production from Mg and H2
using nano-crystalline Mg produced in ball mills has
been investigated. Other preparations include:
1. The hydrogenation of magnesium anthracene under
mild conditions:
Mg(anthracene)＋H2→MgH2＋C14H10
2. The reaction of diethyl magnesium with LiAlH4
3. An adduct of complexed MgH2, e.g. MgH2·THF by
the reaction of phenylsilane (C6H8Si) and dibutyl
magnesium in ether or hydrocarbon solvents in the
presence of THF (C4H8O) using TMEDA
(Tetramethylethylenediamine＝(CH3)2NCH2CH2N
(CH3)2) as a ligand.

Magnesium hydride

7693-27-8: MgH2 contains 7.66% by weight of hydrogen and has
been studied as a potential hydrogen-storage medium. It
was discovered in 1912, during the pyrolysis of ethyl
magnesium iodide (a Grignard reagent), which produced
small amount of MgH2. In 1951, preparation from the
elements was first reported involving direct hydrogenation
of Mg metal at high pressure and temperature (200 atmospheres, 500°C)with magnesium iodide as a catalyst:
Mg＋H2→MgH2
Lower temperature production from Mg and H2
using nano-crystalline Mg produced in ball mills has
been investigated. Other preparations include:
1. The hydrogenation of magnesium anthracene under
mild conditions:
Mg(anthracene)＋H2→MgH2＋C14H10
2. The reaction of diethyl magnesium with LiAlH4
3. An adduct of complexed MgH2, e.g. MgH2·THF by
the reaction of phenylsilane (C6H8Si) and dibutyl
magnesium in ether or hydrocarbon solvents in the
presence of THF (C4H8O) using TMEDA
(Tetramethylethylenediamine＝(CH3)2NCH2CH2N
(CH3)2) as a ligand.

CAS 7693-27-8

Magnesium hydride

Magnesium hydride

Ref: 54-IN14113