Bismuth trifluoride

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Bismuth trifluoride
Bismuth trifluoride
Identifiers
CAS number 7787-61-3
PubChem 82233
ChemSpider 21172751
Jmol-3D images Image 1
Properties
Molecular formula BiF3
Molar mass 265.97550 g/mol
Appearance grey-white powder
Density 5.32 g cm-3[1]
Melting point 649˚C[2]
Solubility in water Insoluble in water[1]
Structure
Crystal structure Orthorhombic, oP16, SpaceGroup = Pnma, No. 62 (β phase)
Hazards
R-phrases R36/38
S-phrases S26
Main hazards Irritant
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

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.

Synthesis[edit]

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

Bi2O3 + 6 HF → 2 BiF3 + 3 H2O

Structure[edit]

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 5, phosphorus trifluoride, PF3, arsenic trifluoride, AsF3 and antimony trifluoride, SbF3, where MX3 molecular units are present in the solid.[3]

Reactions[edit]

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[edit]

  1. ^ a b http://www.alfa.com/content/msds/english/11844.pdf
  2. ^ a b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419. 
  3. ^ a b 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.