Molybdenum Difluoride Dioxide

Molybdenum difluoride dioxide
Names
	Other names molybdenum dioxide difluoride
Identifiers
CAS Number	13824-57-2;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/2FH.Mo.2O/h2*1H;;;/q;;+2;;/p-2 Key: RMUNMMZEBAMTER-UHFFFAOYSA-L;
	SMILES O=[Mo](F)(F)=O;
Properties
Chemical formula	F2MoO2
Molar mass	165.94 g·mol−1
Appearance	white solid
Density	3.82 g/cm3
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Molybdenum difluoride dioxide is the inorganic compound with the formula MoF₂O₂. It is a white, diamagnetic, volatile solid.^[1]

Structure

Structure of solid MoF₂O₂. X positions are occupied by O or F.

Gaseous molybdenum difluoride dioxide is a tetrahedral molecule.^[2] According to X-ray crystallography, the solid is a coordination polymer consisting of trigonal primatic chains of made by linking Mo
3F
6O
6 monomers. The fluoride and oxide positions are disordered.^[3] 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:^[3]

Na
2MoO
4 + 4 HF → Na
2MoF
4O
2 + 2 H
2O

Heating sodium dioxotetrafluoride to 400 °C gives monomeric difluoride dioxide, which polymerizes upon condensation:

Na
2MoF
4O
2 → 2 NaF + MoF
2O
2

The compound also arises by hydrolysis of molybdenum oxytetrafluoride:

MoF
4O + H
2O → 2 HF + MoF
2O
2

The compound dissolves in dimethylformamide to give a bis(adduct):^[4]

MoF
2O
2 + 2 OC(H)N(CH
3)
2 → MoF
2O
2(OC(H)N(CH
3)
2)
2

References

↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1023. ISBN 978-0-08-037941-8.
↑ Ward, Brian G.; Stafford, Fred E. (1968). "Synthesis and Structure of Four- and Five-Coordinated Gaseous Oxohalides of Molybdenum(VI) and Tungsten(VI)". Inorganic Chemistry 7 (12): 2569–2573. doi:10.1021/ic50070a020.
↑ ^3.0 ^3.1 Shorafa, Hashem; Ficicioglu, Halil; Tamadon, Farhad; Girgsdies, Frank; Seppelt, Konrad (2010). "Molybdenum Difluoride Dioxide, MoO2F2". Inorganic Chemistry 49 (9): 4263–4267. doi:10.1021/ic1000864. PMID 20380384.
↑ Benjamin, Sophie L.; Levason, William; Reid, Gillian (2013). "Medium and high oxidation state metal/Non-metal fluoride and oxide–fluoride complexes with neutral donor ligands". Chem. Soc. Rev. 42 (4): 1460–1499. doi:10.1039/C2CS35263J. PMID 23014811.

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[1] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1023. ISBN 978-0-08-037941-8.

[2] Ward, Brian G.; Stafford, Fred E. (1968). "Synthesis and Structure of Four- and Five-Coordinated Gaseous Oxohalides of Molybdenum(VI) and Tungsten(VI)". Inorganic Chemistry 7 (12): 2569–2573. doi:10.1021/ic50070a020.

[Seppelt-3] 3.0 ^3.1 Shorafa, Hashem; Ficicioglu, Halil; Tamadon, Farhad; Girgsdies, Frank; Seppelt, Konrad (2010). "Molybdenum Difluoride Dioxide, MoO2F2". Inorganic Chemistry 49 (9): 4263–4267. doi:10.1021/ic1000864. PMID 20380384.

[4] Benjamin, Sophie L.; Levason, William; Reid, Gillian (2013). "Medium and high oxidation state metal/Non-metal fluoride and oxide–fluoride complexes with neutral donor ligands". Chem. Soc. Rev. 42 (4): 1460–1499. doi:10.1039/C2CS35263J. PMID 23014811.

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Molybdenum Difluoride Dioxide

Contents

Structure

Synthesis and reactions

Further reading

References