Diborane
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See also: diborane(2) and diborane(4)
Diborane(6), commonly known as diborane, is the chemical compound with the formula B2H6. It is a toxic, colorless, and pyrophoric gas with a repulsively sweet odor. Given its simple formula, borane is a fundamental boron compound. It has attracted wide attention for its electronic structure. Several of its derivatives are useful reagents.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Diborane(6) | |
Identifiers | |
3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.039.021 |
EC Number |
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PubChem CID |
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RTECS number |
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UNII | |
UN number | 1911 |
CompTox Dashboard (EPA) |
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Properties | |
B2H6 | |
Molar mass | 27.67 g·mol−1 |
Appearance | Colorless gas |
Odor | repulsive and sweet |
Density | 1.131 g/L[1] |
Melting point | −164.85 °C (−264.73 °F; 108.30 K)[1] |
Boiling point | −92.49 °C (−134.48 °F; 180.66 K)[1] |
Reacts[2] | |
Solubility in other solvents | Diglyme and Diethyl Ether,[3] |
Vapor pressure | 39.5 atm (16.6 °C)[2] |
Structure | |
Tetrahedral (for boron) | |
see text | |
0 D | |
Thermochemistry | |
Heat capacity (C) |
56.7 J/(mol·K)[4] |
Std molar entropy (S⦵298) |
232.1 J/(mol·K)[4] |
Std enthalpy of formation (ΔfH⦵298) |
36.4 kJ/mol[4] |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards |
toxic, highly flammable, reacts with water |
GHS labelling: | |
Danger | |
H220, H280, H314, H330, H370, H372 | |
P210, P260, P264, P270, P271, P280, P284, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P307+P311, P310, P314, P320, P321, P363, P377, P381, P403, P403+P233, P405, P410+P403, P501 | |
NFPA 704 (fire diamond) | |
38 °C (100 °F; 311 K) | |
Explosive limits | 0.8–88%[2] |
Lethal dose or concentration (LD, LC): | |
LC50 (median concentration) |
40 ppm (rat, 4 h) 29 ppm (mouse, 4 h) 40–80 ppm (rat, 4 h) 159–181 ppm (rat, 15 min)[6] |
LCLo (lowest published) |
125 ppm (dog, 2 h) 50 ppm (hamster, 8 h)[6] |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 0.1 ppm (0.1 mg/m3)[2] |
REL (Recommended) |
TWA 0.1 ppm (0.1 mg/m3)[2] |
IDLH (Immediate danger) |
15 ppm[2] |
Safety data sheet (SDS) | ICSC 0432 |
Related compounds | |
Related boron compounds |
Decaborane BF3 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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