Bismuth trifluoride

Bismuth trifluoride
Names
IUPAC name
Bismuth(III) fluoride
Other names
Bismuth trifluoride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.204
Properties
BiF3
Molar mass 265.97550 g/mol
Appearance grey-white powder
Density 5.32 g cm−3[1]
Melting point 649˚C[2]
Insoluble in water[1]
-61.0·10−6 cm3/mol
Structure
Orthorhombic, oP16, SpaceGroup = Pnma, No. 62 (β phase)
Hazards
Main hazards Irritant
R-phrases (outdated) R36/38
S-phrases (outdated) S26
NFPA 704
Flammability code 0: Will not burn. E.g., waterHealth code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentineReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
0
1
0
Related compounds
Other anions
 Bismuth chloride
Other cations
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Bismuth(III) fluoride or bismuth trifluoride is a chemical compound of bismuth and fluorine. The chemical formula is BiF3. It is a grey-white powder melting at 649°C.

It occurs in nature as the rare mineral gananite.

Synthesis

Bismuth trifluoride can be prepared by reacting bismuth(III) oxide with hydrofluoric acid:[2]

Bi2O3 + 6 HF → 2 BiF3 + 3 H2O

Structure

α-BiF3 has a cubic crystalline structure (Pearson symbol cF16, space group Fm-3m, No. 225). β-BiF3 has the YF3 structure where the bismuth atom has distorted 9 coordination, tricapped trigonal prism.[3] This structure is generally considered to be ionic, and contrasts with fluorides of the lighter members of group 15, phosphorus trifluoride, PF3, arsenic trifluoride, AsF3 and antimony trifluoride, SbF3, where MX3 molecular units are present in the solid.[3]

Reactions

BiF3 is unaffected by water and is almost insoluble. It does not form complexes readily but the following, BiF3.3HF and BiF4− in NH4BiF4, are known. The addition compound H3BiF6 is hydrolysed by water forming BiOF.[4]

References

  1. 1 2 http://www.alfa.com/content/msds/english/11844.pdf
  2. 1 2 Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.
  3. 1 2 Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6
  4. ↑ Norman, Nicholas C (1998). Chemistry of arsenic, antimony, and bismuth. p. 88. ISBN 978-0-7514-0389-3.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.