Magnesium diamide Chemical Properties

Melting point:

decomposes when heated [HAW93]

Density 

d425 1.39

solubility 

reacts with H2O

form 

white powder

color 

white powder; flammable

Water Solubility 

reacts violently with H2O releasing NH3 [MER06]

EPA Substance Registry System

Magnesium amide (Mg(NH2)2) (7803-54-5)

Safety Information

RIDADR 

2004

HazardClass 

4.2

PackingGroup 

II

Magnesium diamide Usage And Synthesis

Chemical Properties

Whitish to gray crystals. D 1.40. Decomposes when heated.

Uses

Polymerization catalyst.

General Description

A whitish to gray-colored crystalline solid. Denser than water. Contact may irritate skin, eyes and mucous membranes. Vapors may be toxic by inhalation. Used to make other chemicals.

Air & Water Reactions

May spontaneously ignite upon exposure to air. Soluble in water. Reacts violently with water to form caustic ammonia/ammonium hydroxide and heat.

Reactivity Profile

Bases or alkalis are chemically similar to sodium hydroxide (NaOH) or sodium oxide (Na2O). They neutralize acids exothermically to form salts plus water. When soluble in water they give solutions having a pH greater than 7.0. Mixing these materials with water can generate troublesome amounts of heat as the base is dissolved or diluted. Bases react with certain metals (such as aluminum and zinc) to form oxides or hydroxides of the metal and generate gaseous hydrogen. Bases may initiate polymerization reactions in polymerizable organic compounds, especially epoxides). They may generate flammable and/or toxic gases with ammonium salts, nitrides, halogenated organics, various metals, peroxides, and hydroperoxides. Materials of this group often serve as catalysts.

Hazard

A pyrophoric material igniting in air at room temperature. Evolves ammonia on vigorous reaction with water.

Health Hazard

Fire will produce irritating, corrosive and/or toxic gases. Inhalation of decomposition products may cause severe injury or death. Contact with substance may cause severe burns to skin and eyes. Runoff from fire control may cause pollution.

Fire Hazard

Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.

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