Aluminium hydride

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CAS:7784-21-6
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Aluminium hydride Basic information
Product Name:Aluminium hydride
Synonyms:Aluminum trihydride;Aluminium hydride;aluminium trihydride;alane;alpha-aluminum trihydride;Trihydridealuminum;ALMINUMHYDRIDE;aluMinuM hydride, alane, AlH3
CAS:7784-21-6
MF:AlH3
MW:30.005358
EINECS:232-053-2
Product Categories:
Mol File:7784-21-6.mol
Aluminium hydride Structure
Aluminium hydride Chemical Properties
Melting point decomposes at 160℃ [HAW93]
density 1.45
form colorless hexagonal crystals
Water Solubility evolves H2 in H2O [HAW93]
CAS DataBase Reference7784-21-6
EPA Substance Registry SystemAluminum trihydride (7784-21-6)
Safety Information
RIDADR 2463
HazardClass 4.3
PackingGroup I
MSDS Information
Aluminium hydride Usage And Synthesis
Chemical Propertiescolorless, nonvolatile solid; can be obtained by reacting an ether solution of AlCl3 with LiH; used as a catalyst for organic polymerization processes [MER06]
Physical propertiesColorless cubic crystal; very unstable; decomposes in water; ?Η°? ?11.0 kcal/mol (-46.0kJ/mol).
UsesAs catalyst for polymerizations; reducing agent. Lithium aluminum hydride, q.v. is a more powerful reagent because of its greater soly.
UsesAluminum Hydride is a relatively unstable polymeric covalent hydride that received considerable attention in the mid- 1960s because of its potential as a high energy additive to solid rocket propellants. The projected uses, including aluminum plating, never materialized, and in spite of intense research and development, commercial manufacture has not been undertaken. The synthetic methods developed were costly.
PreparationAluminum hydride is prepared by the reaction of lithium hydride with aluminum chloride in diethyl ether.
3LiH + AlCl3 → AlH3 + 3LiCl
General DescriptionA colorless to white solid.
Air & Water ReactionsIgnites in moist air. Ignites in air with or without oxygen enrichment [Bretherick 1979 p. 221]. Explosively hydrolyzed by water (forms hydrogen gas) [Ruff J.K. Inorg. Synth 1967, 9, 34].
Reactivity ProfileAluminium hydride is a powerful reducing agent. May react violently with oxidizers. Prolonged exposure to heat may cause spontaneous decomposition. Can also decompose spontaneously at ambient temperature with explosive violence. Occasionally, explosions have occurred when Aluminium hydride was stored in ether. The explosions have been blamed on the presence of carbon dioxide impurity in the ether [J. Amer. Chem. Soc. 70:877 1948]. Can emit toxic fumes on contact with acid or fumes from an acid. [Lewis]. At elevated temperatures, the hydride reduces carbon dioxide or sodium hydrogen carbonate to methane and ethane. These gases are the explosive products formed when CO2 extinguishers have been used during hydride fires. The 1:1 complexes of the hydride (as a complex with ether or dimethylamine) and various tetrazole derivatives are explosive. Tetrazoles include, 2-methyl, 2-ethyl, 5-ethyl, 2-methyl-5-vinyl, 5-amino-2-ethyl, etc., [US Pat. 3 396 170, 1968].
Health HazardInhalation 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 HazardProduce 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.
Safety ProfileHydrides of some metals (such as ASH3 are extremely toxic. Dangerous fire hazard. An unstable material which is spontaneously flammable in air or O2. Evolves explosive H2 upon contact with moisture. Severe explosion hazard by chemical reaction wherein H2 gas is produced, also in contact with methyl ethers contaminated by Con. Mixtures with tetrazole derivatives are explosive. Reacts with oxidzing materials. On contact with acid or acid fumes, it can emit toxic fumes. See also HYDRIDES and ALUMINUM COMPOUNDS.
Aluminium hydride Preparation Products And Raw materials
Preparation ProductsLithium Aluminum Hydride
Tag:Aluminium hydride(7784-21-6) Related Product Information
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