Molybdenum difluoride dioxide is the inorganic compound with the formula MoF2O2. It is a white, diamagnetic, volatile solid.
Structure
Gaseous molybdenum difluoride dioxide is a tetrahedral molecule. According to X-ray crystallography, the solid is a coordination polymer consisting of trigonal primatic chains of made by linking Mo3F6O6 monomers. The fluoride and oxide positions are disordered. A similar motif is adopted by titanium tetrafluoride.
Synthesis and reactions
The compound can be obtained by thermal decomposition of the dioxotetrafluoride, which in turn is obtained from sodium molybdate:
- Na2MoO4 4 HF → Na2MoF4O2 2 H2O
Heating sodium dioxotetrafluoride to 400 °C gives monomeric difluoride dioxide, which polymerizes upon condensation:
- Na2MoF4O2 → 2 NaF MoF2O2
The compound also arises by hydrolysis of molybdenum oxytetrafluoride:
- MoF4O H2O → 2 HF MoF2O2
The compound dissolves in dimethylformamide to give a bis(adduct):
- MoF2O2 2 OC(H)N(CH3)2 → MoF2O2(OC(H)N(CH3)2)2
Further reading
- Edwards, A. J.; Steventon, B. R. (1968). "Fluoride crystal structures. Part II. Molybdenum oxide tetrafluoride". Journal of the Chemical Society A: Inorganic, Physical, Theoretical: 2503. doi:10.1039/j19680002503.
- Turnbull, Douglas; Chaudhary, Praveen; Leenstra, Dakota; Hazendonk, Paul; Wetmore, Stacey D.; Gerken, Michael (2020). "Reactions of Molybdenum and Tungsten Oxide Tetrafluoride with Sulfur(IV) Lewis Bases: Structure and Bonding in [WOF4]4, MOF4(OSO), and [SF3][M2O2F9] (M = Mo, W)". Inorganic Chemistry. 59 (23): 17544–17554. doi:10.1021/acs.inorgchem.0c02783. PMID 33200611. S2CID 226989898.
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