| 词条 | Molybdenum hexafluoride |
| 释义 |
| Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 428735896 | Name = Molybdenum hexafluoride | ImageFile = Molybdenum(VI)-fluoride.svg | ImageSize = 150px | IUPACNames = molybdenum(VI) fluoride | OtherNames = molybdenum hexafluoride |Section1={{Chembox Identifiers | CASNo_Ref = {{cascite|correct|??}} | CASNo = 7783-77-9 | PubChem = 82219 | EINECS = 232-026-5 | InChI = 1S/6FH.Mo/h6*1H;/q;;;;;;+6/p-6 | SMILES = F[Mo](F)(F)(F)(F)F |Section2={{Chembox Properties | Formula = MoF6 | Appearance = white crystals[1] or colorless liquid hygroscopic | MolarMass = 209.93 g/mol | Density = 3.50 g/cm3[2] | Solubility = hydrolyzes | MeltingPtC = 17.5 | MeltingPt_ref = [1] | BoilingPtC = 34.0 | BoilingPt_ref = [1] | MagSus = −26.0·10−6 cm3/mol }} |Section3={{Chembox Structure | CrystalStruct = Orthorhombic, oP28 | SpaceGroup = Pnma, No. 62 | Coordination = octahedral (Oh) | Dipole = 0 |Section7={{Chembox Hazards | ExternalSDS = | MainHazards = | FlashPt = | RPhrases = | SPhrases = |Section8={{Chembox Related | OtherCations = Tungsten hexafluoride Uranium hexafluoride }} Molybdenum hexafluoride, also molybdenum(VI) fluoride is the inorganic compound with the formula MoF6. It is the highest fluoride of molybdenum. A colourless solid, it melts just below room temperature.[3] It is one of the seventeen known binary hexafluorides. SynthesisMolybdenum hexafluoride is made by direct reaction of molybdenum metal in an excess of elemental fluorine:[2] {{chem|Mo}} + 3 {{chem|F|2}} → {{chem|Mo|F|6}} Typical impurities are MoO2F2 and MoOF4, reflecting the tendency of the hexafluoride to hydrolyze.[4] DescriptionAt −140 °C, it crystallizes in the orthorhombic space group Pnma. Lattice parameters are a = 9.394 Å, b = 8.543 Å, and c = 4.959 Å. There are four formula units (in this case, discrete molecules) per unit cell, giving a density of 3.50 g·cm−3.[2] The fluorine atoms are arranged in the hexagonal close packing.[5] In liquid and gas phase, MoF6 adopt octahedral molecular geometry with point group Oh. The Mo–F bond length is 1.817 Å.[2] ApplicationsMolybdenum hexafluoride has few uses. In the nuclear industry, MoF6 occurs as an impurity in uranium hexafluoride since molybdenum is a fission product of uranium. It is also an impurity in tungsten hexafluoride, which is used in the semiconductor industry. MoF6 can be removed by reduction of a WF6-MoF6 mixture with any of a number of elements including molybdenum at moderately elevated temperature.[6][7] References1. ^1 2 CRC Handbook of Chemistry and Physics, 90th Edition, CRC Press, Boca Raton, Florida, 2009, {{ISBN|978-1-4200-9084-0}}, Section 4, Physical Constants of Inorganic Compounds, p. 4-85. {{Hexafluorides}}{{Molybdenum compounds}}{{fluorine compounds}}2. ^1 2 3 T. Drews, J. Supeł, A. Hagenbach, K. Seppelt: "Solid State Molecular Structures of Transition Metal Hexafluorides", in: Inorganic Chemistry, 2006, 45 (9), S. 3782–3788; {{DOI|10.1021/ic052029f}}; {{PMID|16634614}} 3. ^{{Greenwood&Earnshaw}} 4. ^W. Kwasnik "Molybdenum(VI) Fluoride" Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 259. 5. ^J. H. Levy, J. C Taylor, A. B. Waugh: "Neutron Powder Structural Studies of UF6, MoF6 and WF6 at 77 K", in: Journal of Fluorine Chemistry, 1983, 23 (1), pp. 29–36; {{DOI|10.1016/S0022-1139(00)81276-2}}. 6. ^US-Patent 5234679: Method of Refining Tungsten Hexafluoride Containing Molybdenum Hexafluoride as an Impurity {{webarchive|url=https://web.archive.org/web/20110612111424/http://www.patentstorm.us/patents/5234679/description.html |date=2011-06-12 }}, 10 August 1993. 7. ^US-Patent 6896866: Method for Purification of Tungsten Hexafluoride {{webarchive|url=https://web.archive.org/web/20110612111437/http://www.patentstorm.us/patents/6896866/description.html |date=2011-06-12 }}, 24 May 2005. 4 : Molybdenum(VI) compounds|Hexafluorides|Metal halides|Octahedral compounds |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。