Rhodium(III) fluoride or rhodium trifluoride is the inorganic compound with the formula RhF3. It is a red-brown, diamagnetic solid.

Rhodium trifluoride
Names
IUPAC name
Rhodium(III) fluoride
Other names
Rhodium trifluoride
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/3FH.Rh/h3*1H;/q;;;+3/p-3
    Key: TXUZMGFRPPRPQA-UHFFFAOYSA-K
  • [F-].[F-].[F-].[Rh+3]
Properties
RhF3
Molar mass 159.90070 g·mol−1
Appearance red-brown solid
Density 5.38 g/cm3[1]
Structure
Trigonal
R3c
a = 4.873, c = 13.550[2]
6
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Synthesis and structure

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The compound is prepared by fluorination of rhodium trichloride:

2 RhCl3 + 3 F2 → 2 RhF3 + 3 Cl2

It can also be obtained by direct combination of the elements:[3]

2 Rh + 3 F2 → 2 RhF3

Anhydrous RhF3 is insoluble in water and does not react with it, but the hydrates RhF3·6H2O and RhF3·9H2O can be prepared by adding hydrofluoric acid to aqueous rhodium(III) solutions.[3]

According to X-ray crystallography, the compound adopts the same structure as vanadium trifluoride, wherein the metal achieves octahedral coordination geometry.[2]

References

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  1. ^ hrsg. von Georg Brauer. Unter Mitarb. von M. Baudler (1975). Handbuch der präparativen anorganischen Chemie / 1 (in German). Stuttgart: Enke. p. 280. ISBN 3-432-02328-6. OCLC 310719485.
  2. ^ a b L. Grosse, R. Hoppe (1987). "Zur Kenntnis von Sr2RhF7. (Mit einer Bemerkung zur Kristallstruktur von RhF3)". Zeitschrift für Anorganische und Allgemeine Chemie. 552 (9): 123–31. doi:10.1002/zaac.19875520914.
  3. ^ a b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 1119–1120. ISBN 978-0-08-037941-8.