Molybdenum difluoride dioxide
chemical compound
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 sodium tetrafluorodioxomolybdate(VI) Na2[MoO2F4], which in turn is obtained from sodium molybdate:
Na2MoO4 + 4 HF → Na2[MoO2F4] + 2 H2O
Heating sodium tetrafluorodioxomolybdate(VI) to 400 °C gives monomeric molybdenum difluoride dioxide, which polymerizes upon condensation:
Na2[MoO2F4] → 2 NaF + MoO2F2
The compound also arises by hydrolysis of molybdenum oxytetrafluoride:
MoOF4 + H2O → 2 HF + MoO2F2
The compound dissolves in dimethylformamide to give a adduct molybdenum difluoride dioxide bis(dimethylformamide):
MoO2F2 + 2 HC(=O)−N(CH3)2 → MoO2F2(HC(=O)−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.
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