Dibortetrafluoride

Structural formula
General
Surname	Dibortetrafluoride
other names	Tetrafluorodiborane
Molecular formula	B 2 F 4
Brief description	colorless gas
External identifiers / databases
PubChem	139653
Wikidata	Q2183990
properties
Molar mass	97.61 g mol −1
Physical state	gaseous
density	3.99 g l −1
Melting point	−56 ° C
boiling point	−34 ° C
solubility	reacts with water
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Dibortetrafluoride is an inorganic chemical compound of boron from the group of fluorides .

Extraction and presentation

Dibortetrafluoride can be obtained by the reaction of fluoridation of dibortetrachloride with antimony trifluoride .

{\ displaystyle \ mathrm {3 \ B_ {2} Cl_ {4} +4 \ SbF_ {3} \ longrightarrow 3 \ B_ {2} F_ {4} +4 \ SbCl_ {3}}}

In addition to other boron fluorides, it is formed when boron trifluoride is passed over boron at 1900–2000 ° С.

It is also formed during the joint condensation of boron trifluoride and copper atoms . For this purpose, metallic copper is evaporated by electrical heating in a vacuum and the vapor consisting of atomic copper is condensed together with boron trifluoride at −196 ° C.

{\ displaystyle \ mathrm {2 \ BF_ {3} +2 \ Cu \ longrightarrow B_ {2} F_ {4} +2 \ CuF}}

properties

Dibortetrafluoride is a colorless, flammable gas that reacts with water. Analogously to dibortetrachloride donors, it accumulates to form adducts B ₂ F ₆ · 2D and slowly decomposes (8% per day at room temperature) into boron trifluoride and a brown solid of the composition BF. In the solid state, dibortetrafluoride has a planar molecule with a valence angle of around 120 °. Single crystals of the compound contain two molecules in a monoclinic unit cell with the space group P 2 ₁ / n (space group no.14, position 2) and parameters of a = 549 pm, b = 653 pm, c = 483 pm and β = 102, 5 °. Template: room group / 14.2

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g William M. Haynes: CRC Handbook of Chemistry and Physics, 96th Edition . CRC Press, 2015, ISBN 978-1-4822-6097-7 , pp. 53 ( limited preview in Google Book search).
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
^ ^A ^b ^c A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1033.
↑ ^a ^b Ralf Steudel : Chemistry of the non-metals with atomic structure, molecular geometry and bond theory . Walter de Gruyter, 1998, ISBN 3-11-012322-3 , p. 554 ( limited preview in Google Book search).
↑ Louis Trefonas, William N. Lipscomb: Crystal and Molecular Structure of Diboron Tetrafluoride, B ₂ F ₄ . In: The Journal of Chemical Physics. 28, 1958, p. 54, doi: 10.1063 / 1.1744079 .

[William_M._Haynes-1] ↑ ^a ^b ^c ^d ^e ^f ^g William M. Haynes: CRC Handbook of Chemistry and Physics, 96th Edition . CRC Press, 2015, ISBN 978-1-4822-6097-7 , pp. 53 ( limited preview in Google Book search).

[NV-2] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[Arnold_F._Holleman,_Egon_Wiberg-3] A ^b ^c A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1033.

[Ralf_Steudel-4] Ralf Steudel : Chemistry of the non-metals with atomic structure, molecular geometry and bond theory . Walter de Gruyter, 1998, ISBN 3-11-012322-3 , p. 554 ( limited preview in Google Book search).

[DOI10.1063/1.1744079-5] Louis Trefonas, William N. Lipscomb: Crystal and Molecular Structure of Diboron Tetrafluoride, B ₂ F ₄ . In: The Journal of Chemical Physics. 28, 1958, p. 54, doi: 10.1063 / 1.1744079 .