Magnesium Hydride 98% (MgH2, Magnesium Dihydride) cas 7693-27-8

Synonyms:
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Properties
Molecular Formula: MgH2
Molecular Weight:26.32
CAS No.:7693-27-8
EINECS No.:231-705-3
Appearance：white Crystalline
Density:1.45g/mL
Melting Point:>250℃
Flash point：>110℃
Solubility: insoluble in normal organic solution； soluble in water

[General Description]
Magnesium Hydride 98% (MgH2, Magnesium Dihydride) cas 7693-27-8is a white crystalline solid. Magnesium hydride reacts violently with water and may ignite upon contact with air. Magnesium hydride is used to make other chemicals.It contains 7.66% by weight of hydrogen and has been studied as a potential hydrogen storage medium.

Preparation
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 MgI2 catalyst
Mg + H2 → MgH2
Lower temperature production from Mg and H2 using nano crystalline Mg produced in ball mills has been investigated.[4] Other preparations include:

the hydrogenation of magnesium anthracene under mild conditions:
Mg(anthracene) + H2 → MgH2
the reaction of diethylmagnesium with lithium aluminium hydride
product of complexed MgH2 e.g. MgH2.THF by the reaction of phenylsilane and dibutyl magnesium in ether or hydrocarbon solvents in the presence of THF or TMEDA as ligand.
Structure and bonding
The room temperature form α-MgH2 has a rutile structure. There are at least four high pressure forms: γ-MgH2 with α-PbO2 structure,[8] cubic β-MgH2 with Pa-3 space group,orthorhombic HP1 with Pbc21 space group and orthorhombic HP2 with Pnma space group.Additionally a non stoichiometric MgH(2-δ) has been characterised, but this appears to exist only for very small particles
(bulk MgH2 is essentially stoichiometric, as it can only accommodate very low concentrations of H vacancies).

The bonding in the rutile form is sometimes described as being partially covalent in nature rather than purely ionic; charge density determination by synchrotron x-ray diffraction indicates that the magnesium atom is fully ionised and spherical in shape and the hydride ion is elongated. Molecular forms of magnesium hydride, MgH, MgH2, Mg2H, Mg2H2, Mg2H3, and Mg2H4 molecules identified by their vibrational spectra have been found in matrix isolated samples at below 10 K, formed following laser ablation of magnesium in the presence of hydrogen. The Mg2H4 molecule has a bridged structure analogous to dimeric aluminium hydride, Al2H6.
Reactions
MgH2 readily reacts with water to form hydrogen gas:
MgH2 + 2 H2O → 2 H2 + Mg(OH)2
At 287 °C it decomposes to produce H2 at 1 bar pressure. The high temperature required is seen as a limitation in the use of MgH2 as a reversible hydrogen storage medium
MgH2 → Mg + H2

[Air & Water Reactions]
Highly flammable. Pyrophoric, ignites spontaneously in air and forms magnesium oxide and water [Merck 11th ed. 1989]. Reacts with water to form caustic solution of magnesium hydroxide and hydrogen gas (H2) and heat sufficient to ignite the evolved hydrogen

[Reactivity Profile]
Hydrides, such as Magnesium Hydride 98% (MgH2, Magnesium Dihydride) cas 7693-27-8, are reducing agents and react rapidly and dangerously with oxygen and with other oxidizing agents, even weak ones. Thus, they are likely to ignite on contact with alcohols. Hydrides are incompatible with acids, alcohols, amines, and aldehydes.

[Health Hazard]
Inhalation or contact with vapors, substance or decomposition products may cause severe injury or death. May produce corrosive solutions on contact with water. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control may cause pollution.

[Fire Hazard]
Produce flammable gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Runoff may create fire or explosion hazard.

[Potential Exposure]
Used in hydrogen production and in production of magnesium alcoholates.

[First aid]
If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit

[Shipping]
UN2010 Magnesium Hydride 98% (MgH2, Magnesium Dihydride) cas 7693-27-8, Hazard Class: 4.3; Labels: 4.3-Dangerous when wet material.

[Incompatibilities]
A strong reducing agent. Pyrophoric: the powder or dust may ignite spontaneously in air, or in the presence of moisture. Contact with water or steam forms magnesium hydroxide, flammable hydrogen gas, and enough heat to ignite the hydrogen. Violent reaction with oxidizers, alcohols, halogens, chlorinated solvents. Incompatible with strong acids, acid chlorides, alcohols, amines and aldehydes. Store under nitrogen. Decomposes @ 280 C in high vacuum

Application of Magnesium Hydride 98% (MgH2, Magnesium Dihydride) cas 7693-27-8
1）heavy metal hydrogen storage materia
Magnesium hydride is tetragonal system colorless cubic crystal or offwhite powder. It is hdyrogen source for fuel battery below 10000W. Hydrogen amount releasing by water is higher than 14.8wt%, which is much higher than high pressure gas hydrogen storage tank(70MPa,~5.5wt%0 and heavy metal hydrogen storage material(<2wt%). Further Magnesium dihydride is safe and highly efficient, which can improve present hydrogen storage method. Hydrolyzing magnesium dihydride as supply hydrogen system in pem fuel cell, which improve energy density of the system significantly. Solid Mg-H fuel battery systems with high-energy density is developed too and its whole energy density is 3-5times higher than lithium battery.
2) strong reducing agent
3) Metal Hydride, Alternative Energy, Sysnthetic Reagents
4) Cosmetics
5) Pharmaceuticals
6) Health Care.

FAQ of Magnesium Hydride 98% (MgH2, Magnesium Dihydride) cas 7693-27-8：

What is magnesium hydride used for?
magnesium hydride is MgH2, it is used in pharmaceutical industry, Health care, and also Cosmetics.

How much does magnesium hydride cost?
it depends on quality and quantity both.

What is the common name of magnesium hydride?
magnesium hydride is MgH2, Magnesium Dihydride, cas 7693-27-8.

Does magnesium hydride exist?
Yes.