Sodium aluminium hydride
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| Names | |
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IUPAC name
Sodium aluminium hydride
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| Other names
Sodium tetrahydroaluminate
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3D model (JSmol)
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| ECHA InfoCard | 100.033.986 |
| EC Number | 237-400-1 |
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PubChem CID
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| Properties | |
| AlH4Na | |
| Molar mass | 54.00 g·mol−1 |
| Appearance | White crystalline solid |
| Density | 1.24 g/cm3 |
| Melting point | 183 °C (361 °F; 456 K) (decomposes) |
| Solubility | soluble in THF (16 g/100 mL at room temperature) |
| Hazards | |
| Safety data sheet | External MSDS |
| Flash point | −22 °C; −7 °F; 251 K |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sodium aluminium hydride or sodium alanate is an inorganic compound with the chemical formula NaAlH4. It is a white pyrophoric solid that dissolves in tetrahydrofuran (THF), but not in diethyl ether or hydrocarbons. It has been evaluated as an agent for the reversible storage of hydrogen and it is used as a reagent for the chemical synthesis of organic compounds. Similar to lithium aluminium hydride, it is a salt consisting of separated sodium cations and tetrahedral AlH−
4 anions.
Sodium tetrahydroaluminate adopts the structure of (is isostructural with) calcium tungstate. As such, the tetrahedral AlH−
4 centers are linked with eight-coordinat Na+ cations. The compound is prepared from the elements under high pressures of H2 at 200 °C using triethylaluminium catalyst:
As a suspension in diethyl ether, it reacts with lithium chloride to give the popular reagent lithium aluminium hydride:
The compound reacts rapidly, even violently, with protic reagents, such as water, as described in this idealized equation:
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