Vanadium dioxide fluoride

Vanadium dioxide fluoride is the inorganic compound with the formula VO₂F. It is an orange diamagnetic solid. The compound adopts the same structure as iron(III) fluoride, with octahedral metal centers and doubly bridging oxide and fluoride ligands. It is prepared by the reaction of vanadium pentoxide and vanadium(V) oxytrifluoride:^[1]

V₂O₅ + VOF₃ → 3VO₂F

Vanadium dioxide fluoride

Identifiers
CAS Number	14259-82-6
3D model (JSmol)	Interactive image
InChI InChI=1S/FH.2O.V/h1H;;;/q;;;+1/p-1 Key: LEFMSXWIPZZRSQ-UHFFFAOYSA-M
SMILES O=[V](F)=O
Properties
Chemical formula	FO2V
Molar mass	101.938 g·mol−1
Appearance	orange solid
Density	3.41 g/cm3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

An alternative synthesis using hexamethyldisiloxane:^[2]

(CH₃)₃SiOSi(CH₃)₃ + VOF₃ → VO₂F + 2 (CH₃)₃SiF

Reactions

Like some other transition metal oxyfluorides, VO₂F reacts with Lewis bases to give 1:2 adducts. One example is the yellow bis(pyridine) derivative VO₂F(NC₅H₅)₂.^[2]

VO₂F has attracted some interest as a cathode in batteries.^[3]

References

1. Pérez-Flores, Juan Carlos; Villamor, Raquel; Ávila-Brande, David; Gallardo Amores, José M.; Morán, Emilio; Kuhn, Alois; García-Alvarado, Flaviano (2015). "VO2F: A new transition metal oxyfluoride with high specific capacity for Li ion batteries". Journal of Materials Chemistry A. 3 (41): 20508–20515. doi:10.1039/C5TA05434F. hdl:10637/7682.
2. Davis, Martin F.; Jura, Marek; Leung, Alethea; Levason, William; Littlefield, Benjamin; Reid, Gillian; Webster, Michael (2008). "Synthesis, Chemistry and Structures of Complexes of the Dioxovanadium(v) Halides VO₂F and VO₂Cl". Dalton Transactions (44): 6265–6273. doi:10.1039/b811422f. PMID 18985260.
3. Kuhn, Alois; Plews, Michael R.; Pérez-Flores, Juan Carlos; Fauth, François; Hoelzel, Markus; Cabana, Jordi; García-Alvarado, Flaviano (2020). "Redox Chemistry and Reversible Structural Changes in Rhombohedral VO2F Cathode during Li Intercalation". Inorganic Chemistry. 59 (14): 10048–10058. doi:10.1021/acs.inorgchem.0c01197. PMID 32589405. S2CID 220118859.