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| verifiedrevid = 405951077 |
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| Name = Molybdenum hexafluoride |
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|verifiedrevid = 428735896 |
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| ImageFile = Molybdenum(VI)-fluoride.svg |
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|Name = Molybdenum hexafluoride |
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| ImageSize = 150px |
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|ImageFile = Molybdenum(VI)-fluoride.svg |
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| IUPACName = |
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|ImageFile1 = Molybdenum-hexafluoride-from-xtal-3D-SF.png |
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| Section1 = {{Chembox Identifiers |
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|ImageSize = 150px |
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| CASNo = 7783-77-9 |
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|IUPACNames = molybdenum(VI) fluoride |
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| CASNo_Ref = {{cascite}} |
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|OtherNames = molybdenum hexafluoride |
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| Section2 = {{Chembox Properties |
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|Section1 = {{Chembox Identifiers |
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|CASNo_Ref = {{cascite|correct|??}} |
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| Formula = MoF<sub>6</sub> |
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|CASNo = 7783-77-9 |
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| Appearance = white crystals or colorless liquid <br> ] |
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|ChemSpiderID = 74199 |
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| MolarMass = 209.93 g/mol |
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|UNII_Ref = {{fdacite|correct|FDA}} |
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| Density = 2.54 g/cm<sup>3</sup> |
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|UNII = ZLT5J123W3 |
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| Solubility = hydrolyzes |
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|PubChem = 82219 |
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| MeltingPtC = 17.5 |
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|EINECS = 232-026-5 |
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| BoilingPtC = 34 |
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|InChI = 1S/6FH.Mo/h6*1H;/q;;;;;;+6/p-6 |
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|SMILES = F(F)(F)(F)(F)F |
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|Section2 = {{Chembox Properties |
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|Formula = MoF<sub>6</sub> |
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|Appearance = white crystals<ref name="CRC_HANDBOOK_MoF6">'']'', 90th Edition, CRC Press, Boca Raton, Florida, 2009, {{ISBN|978-1-4200-9084-0}}, Section 4, ''Physical Constants of Inorganic Compounds'', p. 4-85.</ref> or colorless liquid <br> ] |
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|MolarMass = 209.93 g/mol |
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|Density = 3.50 g/cm<sup>3</sup><ref name="D_BLOCK_XF6">T. Drews, J. Supeł, A. Hagenbach, K. Seppelt: "Solid State Molecular Structures of Transition Metal Hexafluorides", in: '']'', '''2006''', ''45 (9)'', S. 3782–3788; {{doi|10.1021/ic052029f}}; {{PMID|16634614}}</ref> |
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|Solubility = hydrolyzes |
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|MeltingPtC = 17.5 |
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|MeltingPt_ref = <ref name="CRC_HANDBOOK_MoF6"/> |
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|BoilingPtC = 34.0 |
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|BoilingPt_ref = <ref name="CRC_HANDBOOK_MoF6"/> |
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|MagSus = −26.0·10<sup>−6</sup> cm<sup>3</sup>/mol |
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|Section3 = {{Chembox Structure |
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|CrystalStruct = ], ] |
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|SpaceGroup = Pnma, No. 62 |
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|Coordination = octahedral (''O<sub>h</sub>'') |
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|Dipole = 0 |
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|Section4 = {{Chembox Related |
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|OtherCations = ]<br>]<br>] |
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| Section3 = {{Chembox Structure |
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| CrystalStruct = ], ] |
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| SpaceGroup = Pnma, No. 62 |
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| Coordination = octahedral (''O<sub>h</sub>'') |
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| Dipole = 0 |
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| Section7 = {{Chembox Hazards |
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| FlashPt = |
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'''Molybdenum hexafluoride''' is the highest ] of ]. It is a solid which melts just below ]; in water, it hydrolyses to give ].<ref>{{Greenwood&Earnshaw}}</ref> |
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'''Molybdenum hexafluoride''', also molybdenum(VI) fluoride, is the ] with the formula MoF<sub>6</sub>. It is the highest ] of ]. It is a colourless solid and melts just below ] and boils in 34 °C.<ref>{{Greenwood&Earnshaw}}</ref> It is one of the seventeen known binary ]s. |
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== Synthesis == |
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It has few uses, and generally appears as an impurity in ] (in the nuclear industry) or ] (in the semiconductor industry; WF<sub>6</sub> is used for ] of tungsten); it can be removed from the latter by reduction of a WF<sub>6</sub>-MoF<sub>6</sub> mixture with any of a number of elements including molybdenum at moderately elevated temperature.<ref>US-Patent 5234679: , 10. August 1993.</ref><ref>US-Patent 6896866: , 24. Mai 2005.</ref> |
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Molybdenum hexafluoride is made by direct reaction of molybdenum metal in an excess of elemental ]:<ref name="D_BLOCK_XF6"/> |
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:{{chem|Mo}} + 3 {{chem|F|2}} → {{chem|Mo|F|6}} |
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The compound hydrolyzes easily,<ref name=KO>{{Kirk-Othmer|doi=10.1002/0471238961.1315122513051908.a01|title=Fluorine compounds, inorganic, molybdenum|first1=Dayal T.|last1=Meshri|year=2000}}</ref> and typical impurities are ] and ].<ref>W. Kwasnik "Molybdenum(VI) Fluoride" Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 259.</ref> |
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== Description == |
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At −140 °C, it crystallizes in the ] space group ''Pnma''. ] are ''a'' = 9.394 ], ''b'' = 8.543 Å, and ''c'' = 4.959 Å. There are four ]s (in this case, discrete molecules) per ], giving a density of 3.50 g·cm<sup>−3</sup>.<ref name="D_BLOCK_XF6"/> The fluorine atoms are arranged in the ].<ref>J. H. Levy, J. C Taylor, A. B. Waugh: "Neutron Powder Structural Studies of UF<sub>6</sub>, MoF<sub>6</sub> and WF<sub>6</sub> at 77 K", in: '']'', '''1983''', ''23'' (1), pp. 29–36; {{doi|10.1016/S0022-1139(00)81276-2}}.</ref> |
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In liquid and gas phase, MoF<sub>6</sub> adopt ] with ] '']''. The Mo–F ] is 1.817 Å.<ref name="D_BLOCK_XF6"/> |
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== Applications == |
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Molybdenum hexafluoride has few uses. In the nuclear industry, MoF<sub>6</sub> occurs as an impurity in ] since molybdenum is a ] of ]. |
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The ] constructs various ] through ] of molybdenum hexafluoride.<ref name=KO /> In some cases, the deposited molybdenum is an impurity in the intended ]. MoF<sub>6</sub> can be removed by reduction of a WF<sub>6</sub>-MoF<sub>6</sub> mixture with any of a number of elements including ] at moderately elevated temperature.<ref>US-Patent 5234679: {{webarchive|url=https://web.archive.org/web/20110612111424/http://www.patentstorm.us/patents/5234679/description.html |date=2011-06-12}}, 10 August 1993</ref><ref>US-Patent 6896866: {{webarchive|url=https://web.archive.org/web/20110612111437/http://www.patentstorm.us/patents/6896866/description.html |date=2011-06-12 }}, 24 May 2005.</ref> |
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== References == |
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== References == |
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{{reflist}} |
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{{reflist}} |
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{{Hexafluorides}} |
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{{Molybdenum compounds}} |
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{{Molybdenum compounds}} |
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{{fluorides}} |
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