Bismuth trifluoride
-fluorid.png) | |
| Names | |
|---|---|
| IUPAC name
Bismuth(III) fluoride | |
| Other names
Bismuth trifluoride | |
| Identifiers | |
| 7787-61-3 | |
| 3D model (Jmol) | Interactive image |
| ChemSpider | 21172751 |
| ECHA InfoCard | 100.029.204 |
| PubChem | 82233 |
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| 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] | |
| Structure | |
| Orthorhombic, oP16, SpaceGroup = Pnma, No. 62 (β phase) | |
| Hazards | |
| Main hazards | Irritant |
| R-phrases | R36/38 |
| S-phrases | S26 |
| Except where otherwise noted, 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
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 5, 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 2 http://www.alfa.com/content/msds/english/11844.pdf
- 1 2 Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.
- 1 2 Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6
- ↑ Norman, Nicholas C (1998). Chemistry of arsenic, antimony, and bismuth. p. 88. ISBN 978-0-7514-0389-3.