Vanadium(IV) fluoride (VF4) is an inorganic compound of vanadium and fluorine. It is paramagnetic yellow-brown solid that is very hygroscopic.[2] Unlike the corresponding vanadium tetrachloride, the tetrafluoride is not volatile because it adopts a polymeric structure.[5] It decomposes before melting.
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| Names | |||
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| IUPAC name
vanadium tetrafluoride
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| Identifiers | |||
3D model (JSmol)
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| ChemSpider | |||
| ECHA InfoCard | 100.030.143 | ||
| EC Number |
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PubChem CID
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| UNII | |||
| UN number | UN2923 | ||
CompTox Dashboard (EPA)
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| Properties | |||
| F4V | |||
| Molar mass | 126.9351 g·mol−1 | ||
| Appearance | Lime green powder, hygroscopic[1] | ||
| Odor | Odorless | ||
| Density | 3.15 g/cm3 (20 °C)[1] 2.975 g/cm3 (23 °C)[2] | ||
| Melting point | 325 °C (617 °F; 598 K) at 760 mmHg decomposes[1] | ||
| Boiling point | Sublimes[1] | ||
| Very soluble[1] | |||
| Solubility | Soluble in acetone, acetic acid Very slightly soluble in SO2Cl2, alcohols, CHCl3[2] | ||
| Structure | |||
| Monoclinic, mP10 | |||
| P21/c, No. 14 | |||
| Thermochemistry | |||
Std molar
entropy (S⦵298) |
126 J/mol·K[3] | ||
Std enthalpy of
formation (ΔfH⦵298) |
−1412 kJ/mol[3] | ||
Gibbs free energy (ΔfG⦵)
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−1312 kJ/mol[3] | ||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Eye hazards
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Causes serious damage | ||
Skin hazards
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Causes burns | ||
| GHS labelling:[4] | |||
 
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| Danger | |||
| H300, H314, H330 | |||
| P260, P301+P310, P303+P361+P353, P304+P340, P305+P351+P338, P320, P330, P405, P501 | |||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation and reactions
editVF4 can be prepared by treating VCl4 with HF:
- VCl4 + 4 HF → VF4 + 4 HCl
It was first prepared in this way.[6]
It decomposes at 325 °C, undergoing disproportionation to the tri- and pentafluorides:[2]
- 2 VF4 → VF3 + VF5
Structure
editThe structure of VF4 is related to that of SnF4. Each vanadium centre is octahedral, surrounded by six fluoride ligands. Four of the fluoride centers bridge to adjacent vanadium centres.[7]
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References
edit- ^ a b c d e Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.
- ^ a b c d Kwasnik, W. (1963). Brauer, Georg (ed.). Handbook of Preparative Inorganic Chemistry (UK ed.). London: Academic Press. pp. 252–253.
- ^ a b c Anatolievich, Kiper Ruslan. "vanadium(IV) fluoride". chemister.ru. Retrieved 2014-06-25.
- ^ "Vanadium(IV) fluoride, 95%". alfa.com. Alfa Aesar. Retrieved 2014-06-25.
- ^ Cotton, F. Albert; Wilkinson, Geoffrey; Murillo, Carlos A.; Bochmann, Manfred (1999), Advanced Inorganic Chemistry (6th ed.), New York: Wiley-Interscience, p. 716, ISBN 0-471-19957-5
- ^ Otto Ruff, Herbert Lickfett "Vanadinfluoride" Chemische Berichte 1911, vol. 44, pages 2539–2549. doi:10.1002/cber.19110440379
- ^ Becker S., Muller B. G. Vanadium Tetrafluoride, Angew. Chem. Intnl. Ed. Engl. 1990, vol. 29, page 406