Diborane

Diborane
Names
	IUPAC name Diborane(6)
Identifiers
CAS Number	19287-45-7 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:33590 ;
ChemSpider	17215804 ;
ECHA InfoCard	100.039.021
EC Number	242-940-6;
PubChem CID	12544638;
RTECS number	HQ9275000;
UNII	BS9K982N24;
UN number	1911
CompTox Dashboard (EPA)	DTXSID9024938 ;
	InChI InChI=1S/B2H6/c1-3-2-4-1/h1-2H2 Key: KLDBIFITUCWVCC-UHFFFAOYSA-N ; 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
Melting point	−164.85 °C (−264.73 °F; 108.30 K)
Boiling point	−92.49 °C (−134.48 °F; 180.66 K)
Solubility in water	Reacts
Solubility in other solvents	Diglyme and Diethyl Ether,
Vapor pressure	39.5 atm (16.6 °C)
Structure
Coordination geometry	Tetrahedral (for boron)
Molecular shape	see text
Dipole moment	0 D
Thermochemistry
Heat capacity (C)	56.7 J/(mol·K)
Std molar; entropy (S⦵298)	232.1 J/(mol·K)
Std enthalpy of; formation (ΔfH⦵298)	36.4 kJ/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	toxic, highly flammable, reacts with water
	GHS labelling:
Pictograms
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)	4 4 3 W
Autoignition; temperature	38 °C (100 °F; 311 K)
Explosive limits	0.8–88%
	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)
LCLo (lowest published)	125 ppm (dog, 2 h); 50 ppm (hamster, 8 h)
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 0.1 ppm (0.1 mg/m3)
REL (Recommended)	TWA 0.1 ppm (0.1 mg/m3)
IDLH (Immediate danger)	15 ppm
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). verify (what is ?) 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.

^ ^a ^b ^c Haynes, p. 4.52.
^ ^a ^b ^c ^d ^e ^f NIOSH Pocket Guide to Chemical Hazards. "#0183". National Institute for Occupational Safety and Health (NIOSH).
^ 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.
^ ^a ^b ^c Haynes, p. 5.6.
^ ^a ^b "Diborane". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
^ "DIBORANE – CAMEO Chemicals - Chemical Datasheet - Database of Hazardous Materials – NOAA". Retrieved 2022-10-26.

[r2-1] Haynes, p. 4.52.

[PGCH-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.

[r1-4] Haynes, p. 5.6.

[IDLH-5] "Diborane". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).

[ICSC-6] "DIBORANE – CAMEO Chemicals - Chemical Datasheet - Database of Hazardous Materials – NOAA". Retrieved 2022-10-26.

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