Molybdenum difluoride dioxide

Molybdenum difluoride dioxide is the inorganic compound with the formula MoF2O2. It is a white, diamagnetic, volatile solid.

Structure

 * [[Image:MoO2F2structure.svg|180px|thumb|left|Structure of solid MoF2O2. X positions are occupied by O or F.]]

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