Beryllium borohydride
Beryllium borohydride is an inorganic compound with the chemical formula Be(BH4)2.
| Names | |
|---|---|
| IUPAC name
Beryllium borohydride | |
| Other names
Beryllium tetrahydroborate(1-) | |
| Identifiers | |
3D model (JSmol) |
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PubChem CID |
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| Properties | |
| Be(BH4)2 | |
| Molar mass | 38.70 g/mol |
| Appearance | white crystals |
| Density | 0.604 g/cm3 |
| Melting point | 91.3 °C (196.3 °F; 364.4 K) |
| Boiling point | 123 °C (253 °F; 396 K) decomposes |
| reacts | |
| Solubility | soluble in benzene, diethyl ether |
| Structure | |
| tetragonal | |
| Thermochemistry | |
Std enthalpy of formation (ΔfH⦵298) |
-108 kJ/mol |
| Hazards | |
| NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 0.002 mg/m3 C 0.005 mg/m3 (30 minutes), with a maximum peak of 0.025 mg/m3 (as Be)[1] |
REL (Recommended) |
Ca C 0.0005 mg/m3 (as Be)[1] |
IDLH (Immediate danger) |
Ca [4 mg/m3 (as Be)][1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Structure
The crystal structure is made up of a helical polymer of BH4Be and BH4 structure units.[2]
Production
Beryllium borohydride is formed by the reaction of beryllium hydride with diborane in an ether solution.
Application
The purest beryllium hydride is obtained by the reaction of triphenylphosphine, PPh3, with beryllium borohydride, Be(BH4)2:[3]
- Be(BH4)2 + 2PPh3 → 2Ph3PBH3 + BeH2
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References
- NIOSH Pocket Guide to Chemical Hazards. "#0054". National Institute for Occupational Safety and Health (NIOSH).
- Marynick, Dennis S.; Lipscomb, William N. (1 April 1972). "Crystal structure of beryllium borohydride". Inorganic Chemistry. 11 (4): 820–823. doi:10.1021/ic50110a033.
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
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