![]() | |
![]() | |
Names | |
---|---|
IUPAC name
Borane carbonyl
| |
Other names
| |
Identifiers | |
3D model (
JSmol)
|
|
ChemSpider | |
PubChem
CID
|
|
CompTox Dashboard (
EPA)
|
|
| |
| |
Properties | |
H3BCO | |
Molar mass | 41.84 g·mol−1 |
Appearance | colorless gas |
Density | 1.71 g/L [1] |
Melting point | −137 [1] °C (−215 °F; 136 K) |
Boiling point | −64 [1] °C (−83 °F; 209 K) |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
Borane carbonyl is the inorganic compound with the formula H3 B C O. This colorless gas is the adduct of borane and carbon monoxide. It is usually prepared by combining borane-ether complexes and CO. The compound is mainly of theoretical and pedagogical interest. [2]
The structure of the molecule of borane carbonyl is H3B−−C≡O+. The B−C≡O linkage is linear. The coordination geometry around the boron atom is tetrahedral. The bond distances are 114.0 pm for the C≡O bond, 152.9 pm for the C−B bond, and 119.4 pm for the B−H bonds. The H−B−H bond angle is 113.7°. The C≡O vibrational band is at 2164.7 cm−1, around 22 cm−1 higher than that of free CO. [3]
Borane carbonyl has an enthalpy of vaporization of 19.7 kJ/ mol (4750 cal/mol). [4] It has electronic state 1A1 and point group symmetry C3v. [5]
Borane carbonyl was discovered in 1937 by reacting diborane with excess carbon monoxide, with the equation:
The reaction quickly reaches equilibrium at 100°C, but at room temperature, the reverse reaction is slow enough to isolate borane carbonyl. This reaction is performed at high pressures, typically with a maximum pressure observed of 1000 to 1600 psi (68.95 to 110.32 bar). [6] It can also be performed at atmospheric pressure, with ethers as a catalyst. [7] [8]
A more recent synthesis of borane carbonyl involves slowly bubbling carbon monoxide through a 1 M H3B− THF solution. The resulting gas stream can be condensed and subsequently bubbled through ethanolic potassium hydroxide to produce the boranocarbonate anion ([H3BCO22− or H3B−−CO−2). [8]
![]() | |
![]() | |
Names | |
---|---|
IUPAC name
Borane carbonyl
| |
Other names
| |
Identifiers | |
3D model (
JSmol)
|
|
ChemSpider | |
PubChem
CID
|
|
CompTox Dashboard (
EPA)
|
|
| |
| |
Properties | |
H3BCO | |
Molar mass | 41.84 g·mol−1 |
Appearance | colorless gas |
Density | 1.71 g/L [1] |
Melting point | −137 [1] °C (−215 °F; 136 K) |
Boiling point | −64 [1] °C (−83 °F; 209 K) |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
Borane carbonyl is the inorganic compound with the formula H3 B C O. This colorless gas is the adduct of borane and carbon monoxide. It is usually prepared by combining borane-ether complexes and CO. The compound is mainly of theoretical and pedagogical interest. [2]
The structure of the molecule of borane carbonyl is H3B−−C≡O+. The B−C≡O linkage is linear. The coordination geometry around the boron atom is tetrahedral. The bond distances are 114.0 pm for the C≡O bond, 152.9 pm for the C−B bond, and 119.4 pm for the B−H bonds. The H−B−H bond angle is 113.7°. The C≡O vibrational band is at 2164.7 cm−1, around 22 cm−1 higher than that of free CO. [3]
Borane carbonyl has an enthalpy of vaporization of 19.7 kJ/ mol (4750 cal/mol). [4] It has electronic state 1A1 and point group symmetry C3v. [5]
Borane carbonyl was discovered in 1937 by reacting diborane with excess carbon monoxide, with the equation:
The reaction quickly reaches equilibrium at 100°C, but at room temperature, the reverse reaction is slow enough to isolate borane carbonyl. This reaction is performed at high pressures, typically with a maximum pressure observed of 1000 to 1600 psi (68.95 to 110.32 bar). [6] It can also be performed at atmospheric pressure, with ethers as a catalyst. [7] [8]
A more recent synthesis of borane carbonyl involves slowly bubbling carbon monoxide through a 1 M H3B− THF solution. The resulting gas stream can be condensed and subsequently bubbled through ethanolic potassium hydroxide to produce the boranocarbonate anion ([H3BCO22− or H3B−−CO−2). [8]