Lithium aluminium hydride is white or off-white crystalline powder, stable in dry air, moist air hydrolysis and cause combustion, soluble in diethyl ether, tetrahydrofuran and the like in an organic solvent; may aldehydes and ketones, acids, anhydrides, esters, quinones, acid chloride other reduced to an alcohol, a primary amine reduction of the nitrile, the halogenated hydrocarbon is a hydrocarbon reduction; but usually not the carbon - carbon double bonds hydrogenated.
Lithium aluminum hydride in a monoclinic crystal structure, space group (English: space group) is P21c, AlH4 tetrahedral ions. Lithium aluminum hydride, Li AlH4 with five adjacent tetrahedron, and with each one of the tetrahedron are bonded hydrogen atoms, with one of the four distance of 1.88-2.00Å, and fifth hydrogen distance longer, as 2.16Å [2], double pyramidal arrangement. Its cell parameters: a = 4.82, b = 7.81, c = 7.92 Å, α = γ = 90 ° and β = 112 °. At high pressure (> 2.2 GPa), the lithium aluminum hydride phase transition occurs, a β-LiAlH4. Right is lithium aluminum hydride cell model, purple ball represents a lithium atom, khaki regular tetrahedron represents AlH4.
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