Beryllium borohydride

Beryllium borohydride is an inorganic compound with the chemical formula Be(BH4)2.

Beryllium borohydride
Names
IUPAC name
Beryllium borohydride
Other names
Beryllium tetrahydroborate(1-)
Identifiers
3D model (JSmol)
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
I41cd, No. 110
Thermochemistry
-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 + 2 PPh3 → 2 Ph3PBH3 + BeH2

References
  1. NIOSH Pocket Guide to Chemical Hazards. "#0054". National Institute for Occupational Safety and Health (NIOSH).
  2. Marynick, Dennis S.; Lipscomb, William N. (1 April 1972). "Crystal structure of beryllium borohydride". Inorganic Chemistry. 11 (4): 820–823. doi:10.1021/ic50110a033.
  3. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.


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