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Diborane information


Diborane
Stereo skeletal formula of diborane with all explicit hydrogens added and assorted measurements
Ball and stick model of diborane
Names
IUPAC name
Diborane(6)
Identifiers
CAS Number
  • 19287-45-7 checkY
3D model (JSmol)
  • Interactive image
ChEBI
  • CHEBI:33590 checkY
ChemSpider
  • 17215804 checkY
ECHA InfoCard 100.039.021 Edit this at Wikidata
EC Number
  • 242-940-6
PubChem CID
  • 12544638
RTECS number
  • HQ9275000
UNII
  • BS9K982N24
UN number 1911
CompTox Dashboard (EPA)
  • DTXSID9024938 Edit this at Wikidata
InChI
  • InChI=1S/B2H6/c1-3-2-4-1/h1-2H2 checkY
    Key: KLDBIFITUCWVCC-UHFFFAOYSA-N checkY
  • InChI=1/B2H6/c1-3-2-4-1/h1-2H2
    Key: KLDBIFITUCWVCC-UHFFFAOYAF
SMILES
  • [BH2]1[H][BH2][H]1
Properties
Chemical formula
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]
Solubility in water
Reacts[2]
Solubility in other solvents Diglyme and Diethyl Ether,[3]
Vapor pressure 39.5 atm (16.6 °C)[2]
Structure
Coordination geometry
Tetrahedral (for boron)
Molecular shape
see text
Dipole moment
0 D
Thermochemistry
Heat capacity (C)
56.7 J/(mol·K)[4]
Std molar
entropy (S298)
232.1 J/(mol·K)[4]
Std enthalpy of
formation fH298)
36.4 kJ/mol[4]
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
toxic, highly flammable, reacts with water
GHS labelling:
Pictograms
GHS02: FlammableGHS04: Compressed GasGHS06: ToxicGHS08: Health hazard
Signal word
Danger
Hazard statements
H220, H280, H314, H330, H370, H372
Precautionary statements
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)
[6]
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g. propaneInstability 3: Capable of detonation or explosive decomposition but requires a strong initiating source, must be heated under confinement before initiation, reacts explosively with water, or will detonate if severely shocked. E.g. hydrogen peroxideSpecial hazard W: Reacts with water in an unusual or dangerous manner. E.g. sodium, sulfuric acid
4
4
3
W
Autoignition
temperature
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)[5]
LCLo (lowest published)
125 ppm (dog, 2 h)
50 ppm (hamster, 8 h)[5]
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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Infobox references

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.

  1. ^ a b c Haynes, p. 4.52.
  2. ^ a b c d e f NIOSH Pocket Guide to Chemical Hazards. "#0183". National Institute for Occupational Safety and Health (NIOSH).
  3. ^ Yerazunis, S., et al. “Solubility of Diborane in the Dimethyl Ether and Diethylene Glycol, in Mixtures of Sodium Borohydride and Dimethyl Ether of Diethylene Glycol, and in Ditertiary Butyl Sulfide.” Journal of Chemical & Engineering Data, vol. 7, no. 3, July 1962, pp. 337–39, doi:10.1021/je60014a004.
  4. ^ a b c Haynes, p. 5.6.
  5. ^ a b "Diborane". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  6. ^ "DIBORANE – CAMEO Chemicals - Chemical Datasheet - Database of Hazardous Materials – NOAA". Retrieved 2022-10-26.

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Diborane

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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...

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Borane

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chemical species, it reacts with itself to form diborane. Thus, it is an intermediate in the preparation of diborane according to the reaction: BX3 +BH4− → HBX3−...

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Covalent bond

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electrons in bonding. This type of bonding occurs in boron hydrides such as diborane (B2H6), which are often described as electron deficient because there are...

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Lifting gas

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far more expensive, rendering use as a lifting gas highly impractical. Diborane is slightly lighter than molecular nitrogen with a molecular mass of 27...

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Sodium hydride

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NaH in mineral oil is often directly used, such as in the production of diborane. NaH is a base of wide scope and utility in organic chemistry. As a superbase...

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NFPA 704

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and will burn readily (e.g., gasoline, acetylene, propane, hydrogen gas, diborane). Includes pyrophoric substances. Flash point below room temperature at...

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Electrophilic addition

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reactions: mercuric acetate, water Hydroboration-oxidation reactions: diborane the Prins reaction: formaldehyde, water March, Jerry; (1985). Advanced...

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Borazine

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Stock and Erich Pohland by a reaction of diborane with ammonia. Borazine can be synthesized by treating diborane and ammonia in a 1:2 ratio at 250–300 °C...

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Borane dimethylsulfide

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solvents. Although usually purchased, BMS can be prepared by absorbing diborane into dimethyl sulfide: B2H6 + 2 S(CH3)2 → 2 BH3·S(CH3)2 It can be purified...

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Boranes

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structure and bonding. First, new synthetic techniques were required to handle diborane and many of its derivatives, which are both pyrophoric and volatile. Alfred...

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Pi bond

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bonds. Examples include diiron hexacarbonyl (Fe2(CO)6), dicarbon (C2), and diborane(2) (B2H2). In these compounds the central bond consists only of pi bonding...

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Molecular symmetry

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vibration is A1g + Eg + T1u . Out of these, only T1u is IR active. B2H6 (diborane) has D2h molecular symmetry. The terminal B-H stretching vibrations which...

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William Lipscomb

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"The structure of diborane". J. Chem. Phys. 15 (8): 614. doi:10.1063/1.1746611. Price, W.C. (1948). "The absorption spectrum of diborane". J. Chem. Phys...

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Ammonia borane

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hydrogen fuel, but is otherwise primarily of academic interest. Reaction of diborane with ammonia mainly gives the diammoniate salt [H2B(NH3)2]+[BH4]−...

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Reducing agent

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alloy (Na + Pb) Zinc amalgam (Zn(Hg)) (reagent for Clemmensen reduction) Diborane Sodium borohydride (Na BH4) Ferrous compounds that contain the Fe2+ ion...

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Gallium

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dimer Ga 2H 6 (digallane) is formed as a gas. Its structure is similar to diborane, having two hydrogen atoms bridging the two gallium centers,: 1031  unlike...

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Boron

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use in the semiconductor industry is produced by the decomposition of diborane at high temperatures and then further purified by the zone melting or Czochralski...

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Boron trioxide

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rate avoids gumming as water evolves. Boron oxide will also form when diborane (B2H6) reacts with oxygen in the air or trace amounts of moisture: 2B2H6(g)...

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Hydride

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in fuel cells sodium hydride: a powerful base used in organic chemistry diborane: reducing agent, rocket fuel, semiconductor dopant, catalyst, used in organic...

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Boron group

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compounds with hydrogen, sometimes called boranes. The simplest borane is diborane, or B2H6. Another example is B10H14. The next group-13 elements, aluminium...

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