Molybdenum oxytetrafluoride
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| ImageFile = MoOF4 (16867-ICSD).jpg
| ImageSize = 180
| ImageAlt =
| IUPACName = Molybdenum(VI) tetrafluoride oxide
| OtherNames =
|Section1={{Chembox Identifiers
| CASNo = 14459-59-7
| CASNo_Comment =
| ChEBI = 30716
| ChemSpiderID = 10329778
| Gmelin = 101090, 555842
| PubChem = 139764
| StdInChI=1S/4FH.Mo.O/h4*1H;;/q;;;;+4;/p-4
| StdInChIKey=YNQWRUOYFUZKDU-UHFFFAOYSA-J
| SMILES = O=[Mo](F)(F)(F)F
}}
|Section2={{Chembox Properties
| Formula = {{chem2|MoOF4}}
| Mo = 1|O=1|F=4
| Appearance = white solid
| Density = 3.3 g/cm3
| MeltingPt =
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| BoilingPt =
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| Solubility = }}
|Section7={{Chembox Hazards
| MainHazards =
| FlashPt =
| AutoignitionPt = }}
| Section9 = {{Chembox Related
| OtherAnions = Molybdenum oxytetrachloride
| OtherCations = {{ubl|Chromium oxytetrafluoride|Tungsten oxytetrafluoride}}
| OtherCompounds = Molybdenum difluoride dioxide
}}
}}
Molybdenum oxytetrafluoride is the inorganic compound with the formula {{chem2|MoOF4|auto=1}}. It is a white, diamagnetic solid. According to X-ray crystallography, it is a coordination polymer consisting of a linear chain of alternating Mo and F atoms. Each Mo center is octahedral, the coordination sphere being defined by oxide, three terminal fluorides, and two bridging fluorides.{{cite journal |doi=10.1039/j19680002503 |title=Fluoride crystal structures. Part II. Molybdenum oxide tetrafluoride |year=1968 |last1=Edwards |first1=A. J. |last2=Steventon |first2=B. R. |journal=Journal of the Chemical Society A: Inorganic, Physical, Theoretical |page=2503}} In contrast to this motif, tungsten oxytetrafluoride crystallizes as a tetramer, again with bridging fluoride ligands.{{cite journal |doi=10.1021/acs.inorgchem.0c02783 |title=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) |year=2020 |last1=Turnbull |first1=Douglas |last2=Chaudhary |first2=Praveen |last3=Leenstra |first3=Dakota |last4=Hazendonk |first4=Paul |last5=Wetmore |first5=Stacey D. |last6=Gerken |first6=Michael |journal=Inorganic Chemistry |volume=59 |issue=23 |pages=17544–17554 |pmid=33200611 |s2cid=226989898}}
Reactions
The acetonitrile adduct of molybdenum oxytetrafluoride can be prepared by treating molybdenum hexafluoride with hexamethyldisiloxane in acetonitrile:{{cite journal |doi=10.1016/j.jfluchem.2017.06.015 |title=Complexes of molybdenum(VI) oxide tetrafluoride and molybdenum(VI) dioxide difluoride with neutral N- and O-donor ligands |year=2017 |last1=Levason |first1=William |last2=Monzittu |first2=Francesco M. |last3=Reid |first3=Gillian |last4=Zhang |first4=Wenjian |last5=Hope |first5=Eric G. |journal=Journal of Fluorine Chemistry |volume=200 |pages=190–197 |doi-access=free |bibcode=2017JFluC.200..190L |hdl=2381/40278 |hdl-access=free}}
:{{chem2|MoF6 + [(CH3)3Si]2O + CH3CN → CH3CN*MoOF4 + 2 (CH3)3SiF}}
Molybdenum oxytetrafluoride is susceptible to hydrolysis to give molybdenum difluoride dioxide.