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Vanadium(III) fluoride

Green powder (trihydrate) at 760 mmHg (anhydrous) ~ 100 C at 760 mmHg (trihydrate) decomposes | NFPA-H = 3 | NFPA-R = 2 | NFPA-F = 0 Vanadium(III) oxide Vanadium(III) nitride

Vanadium(III) fluoride is the chemical compound with the formula VF3. It is a yellow-green crystalline solid with hexacoordinate vanadium atoms and bridging fluorine atoms. The magnetic moment indicates the presence of two unpaired electrons. Similar to other transition-metal fluorides (such as MnF2), it exhibits magnetic ordering at low temperatures (e.g. V2F6.4H2O orders below 12 K).

Preparation

Vanadium(III) fluoride is obtained in a two-step procedure from V2O3.

The first step entails conversion to the hexafluorovanadate(III) salt using ammonium bifluoride: :V2O3 + 6 (NH4)HF2 → 2 (NH4)3VF6 + 3 H2O

In the second step, the hexafluorovanadate is thermally decomposed. :(NH4)3VF6 → 3 NH3 + 3 HF + VF3

The thermal decomposition of ammonium salts is a relatively common method for the preparation of inorganic solids.

It can also be prepared by treatment of V2O3 with HF.

References

General references

References

  1. {{CRC90
  2. (2007). "Structure and Chemistry of Crystalline Solids". Springer Science+Business Media, Inc..
  3. {{Sigma-Aldrich
  4. S. Nakhal et al., Z. Kristallogr. 228, 347 (2013).{{doi. 10.1524/zkri.2013.1664
  5. Sturm, B. J.; Sheridan, C. W. "Vanadium(III) Fluoride" Inorganic Syntheses 1963; Vol. 7, pages 52-54. {{ISBN. 0-88275-165-4.
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fluorides metal-halides vanadium(iii)-compounds
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