Formula VF4 Density 2.98 g/cm³ | Molar mass 126.9351 g/mol Melting point 325 °C | |
Appearance Lime green powder, hygroscopic | ||
Vanadium(IV) fluoride (VF4) is an inorganic compound of vanadium and fluorine. It is paramagnetic yellow-brown solid that is very hygroscopic. Unlike the corresponding vanadium tetrachloride, the tetrafluoride is not volatile because it adopts a polymeric structure. It decomposes before melting.
Contents
Preparation and reactions
VF4 can be prepared by treating VCl4 with HF:
VCl4 + 4 HF → VF4 + 4 HClIt was first prepared in this way.
It decomposes at 325 °C, undergoing disproportionation to the tri- and pentafluorides:
2 VF4 → VF3 + VF5Structure
The 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.
References
Vanadium tetrafluoride Wikipedia(Text) CC BY-SA