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Bismuth pentafluoride
Other names
bismuth(V) fluoride
Molar mass 303.97 g mol−1
Appearance long white needles,[1] colourless crystalline solid[2]
Density 5.40 g cm−3[1]
Melting point 151.4 °C[2], 154.4 °C[1]
Boiling point 230 °C[1][2]
octahedral Bi
Related compounds
Other anions
bismuth trichloride, bismuth tribromide, bismuth triiodide, pentamethylbismuth
Other cations
phosphorus pentafluoride, arsenic pentafluoride, antimony pentafluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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Bismuth pentafluoride, BiF5, is chemical compound of bismuth and fluorine.


BiF5 is polymeric and consists of linear chains of trans-bridged corner sharing BiF6 octahedra.[1][3] This is the same structure as α-UF5 and is in contrast to bismuth trifluoride, BiF3, which is ionic and adopts the YCl3 structure.[1]


BiF5 can be prepared by reacting BiF3 with F2 at 500 °C.[2]

BiF3 + F2 → BiF5

An alternative synthesis uses ClF3 as the fluorinating agent at 350 °C.[4]

BiF3 + ClF3 → BiF5 + ClF


Bismuth pentafluoride is the most reactive of the Group 15 pentafluorides and is an extremely strong fluorinating agent. It reacts vigorously with water to form ozone and oxygen difluoride, and with iodine or sulfur at room temperature. BiF5 fluorinates paraffin oil (hydrocarbons) to fluorocarbons above 50 °C and oxidises UF4 to UF6 at 150 °C. At 180 °C, bismuth pentafluoride fluorinates Br2 to BrF3 and Cl2 to ClF.[1]

BiF5 also reacts with alkali metal fluorides, MF, to form hexafluorobismuthates, M[BiF6], containing the hexafluorobismuthate anion, [BiF6].[2]


  1. ^ a b c d e f g Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 561–563. ISBN 0-08-037941-9. 
  2. ^ a b c d e Holleman, A. F.; Wiberg, E. (2001), Inorganic Chemistry, San Diego: Academic Press, pp. 769–770, ISBN 0-12-352651-5 
  3. ^ C. Hebecker (1971). "Zur Kristallstruktur von Wismutpentafluorid". Z. anorg. allg. Chem. 384 (2): 111–114. doi:10.1002/zaac.19713840204. 
  4. ^ A. I. Popov, A. V. Scharabarin, V. F. Sukhoverkhov, N. A. Tchumaevsky (1989). "Synthesis and properties of pentavalent antimony and bismuth fluorides". Z. anorg. allg. Chem. 576 (1): 242–254. doi:10.1002/zaac.19895760128. 

Google Books: Holleman & Wiberg: bismuth pentafluoride