Boron compounds: boron trifluoride
The boron in boron trifluoride formally is in the oxidation state 3.
- Formula as often written: BF3
- Hill system formula: B1F3
- CAS registry number: [7637-07-2]
- Formula weight: 67.806
- Class: fluoride
- boron trifluoride
- boron(III) fluoride
- boron fluoride
- Colour: colourless
- Appearance: gas
- Melting point: -127°C
- Boiling point: -101°C
- Density: 3.0 kg m-3
Element percentages for the elements in boron trifluoride
6NaBF4 + B2O3 + 6H2SO4 → 8BF3 + 6NaHSO4 + 3H2O
Boron trifluoride can be made by treating a mixture of dry boric oxide and sodium fluoroborate with concentrated sulphuric acid. The boron trifluoride product is distilled away under vacuum. The yield is nearly quantitative.
Solid state structure
- Geometry of boron: 3 coordinate: trigonal
- Prototypical structure:
What follows is the calculated isotope pattern for the BF3 unit with the most intense ion set to 100%.
67 24.8 ____________
68 100.0 __________________________________________________
The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.
- R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
- N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
- F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
- A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
- R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
- A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
- A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
- J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
- D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
- J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
- J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.