Chemical elements
    Physical Properties
    Chemical Properties
      Molybdenum Hexafluoride
      Molybdenum Dichloride
      Molybdenum Trichloride
      Molybdenum Tetrachloride
      Molybdenum Pentachloride
      Molybdenum Oxychlorides
      Chlormolybdic Acids
      Molybdenum Dibromide
      Molybdenum Tribromide
      Molybdenum Tetrabromide
      Molybdenum Oxybromide
      Molybdenum Di-iodide
      Molybdenum Oxyiodide
      Iodomolybdic Acid
      Molybdenum Sesquioxide
      Molybdenum Dioxide
      Molybdenum Oxide Blue
      Molybdenum Trioxide
      Aluminium Molybdates
      Ammonium Molybdate
      Ammonium Dimolybdate
      Ammonium Paramolybdate
      Ammonium Trimolybdate
      Ammonium Tetramolybdate
      Ammonium Octamolybdate
      Barium Molybdates
      Barium Paramolybdate
      Barium Trimolybdate
      Barium Tetramolybdate
      Barium Octamolybdate
      Barium Nonamolybdate
      Beryllium Molybdate
      Bismuth Molybdates
      Cadmium Molybdates
      Caesium Molybdates
      Calcium Molybdate
      Calcium Trimolybdate
      Calcium Tetramolybdate
      Calcium Octamolybdate
      Chromium Molybdates
      Cobalt Molybdates
      Cobalt Dimolybdate
      Cobalt Trimolybdate
      Copper Molybdates
      Ferrous Molybdate
      Ferric Molybdate
      Indium Molybdate
      Lead Molybdates
      Lithium Molybdate
      Lithium Dimolybdate
      Lithium Paramolybdate
      Lithium Trimolybdate
      Lithium Tetramolybdate
      Magnesium Molybdates
      Magnesium Paramolybdate
      Magnesium Trimolybdate
      Manganese Molybdate
      Mercurous Molybdates
      Nickel Molybdates
      Potassium Molybdate
      Potassium Dimolybdate
      Potassium Paramolybdate
      Potassium Trimolybdate
      Potassium Tetramolybdate
      Potassium Octamolybdate
      Potassium Decamolybdate
      Rhodium Molybdates
      Rubidium Molybdate
      Rubidium Dimolybdate
      Rubidium Paramolybdate
      Rubidium Trimolybdate
      Rubidium Tetramolybdates
      Silver Molybdates
      Normal Silver Molybdate
      Sodium Molybdate
      Sodium Dimolybdate
      Sodium Paramolybdate
      Sodium Trimolybdate
      Sodium Tetramolybdate
      Sodium Iodomolybdate
      Strontium Molybdate
      Thallous Molybdate
      Thallous Paramolybdate
      Thallous Tetramolybdate
      Thorium Molybdate
      Uranium Molybdates
      Uranyl Octamolybdate
      Zinc Molybdates
      Zinc Trimolybdate
      Zinc Tetramolybdate
      Zinc Octamolybdate
      Zirconium Molybdate
      Permolybdic Acid
      Molybdenum Sesquisulphide
      Molybdenum Disulphide
      Dimolybdenum Pentasulphide
      Molybdenum Trisulphide
      Molybdenum Tetrasulphide
      Ammonium Thiomolybdates
      Ammonium Molybdosulphites
      Potassium Thiomolybdate
      Potassium Thiodimolybdate
      Potassium Dithiodioxymolybdate
      Potassium Molybdosulphite
      Sodium Thiomolybdates
      Sodium Molybdosulphites
      Molybdenum Sulphates
      Molybdenum Selenide
      Complex Molybdoselenites
      Chromates of Molybdenum
      Molybdenum Phosphide
      Molybdic Metaphosphate
      Heteropoly-compounds with Phosphorus
      12-Molybdophosphoric Acid
      9-Molybdophosphoric Acid
      172-Molybdophosphoric Acid
      Molybdenum Carbides
      Molybdenum Carbonyl
      Reddish-violet Salts
      Yellow Salts
      Thiocyanates of Molybdenum
      Molybdenum Monosilicide
      Molybdenum Sesquisilicide
      Molybdenum Disilicide
      Molybdosilicic Acid and Molybdosilicates
      12-Molybdosilicic Acid
    PDB 1aa6-1qh8
    PDB 1r27-2jir
    PDB 2min-3unc
    PDB 3uni-4f6t

Molybdenum Hexafluoride, MoF6

Molybdenum Hexafluoride, MoF6, the only fluoride known with certainty to exist, is best prepared by the action of fluorine on the finely divided metal at 60° to 70° C., the product being collected in a vessel cooled by a mixture of solid carbon dioxide and alcohol. It forms white crystals which melt at 17° C., the boiling-point of the liquid being 35° C. It is decomposed by water, yielding the blue oxide, but does not react with chlorine, sulphur dioxide, or dry air; it is absorbed by alkali or ammonium hydroxides, and forms double salts with alkali fluorides. It also reacts with ammonia, with production of a brown powder.

Interaction of molybdenum pentachloride and anhydrous hydrogen fluoride yields a fluoride of molybdenum, while the existence of fluorides of the formulae MoF3 and MoF4 has been affirmed. Double salts of the formulae KMoF4.H2O, (NH4)MoF4.H2O, K3Mo2F9.2H2O, and (NH4)3Mo2F9.2H2O have been described.

Two oxyfluorides, respectively MoOF4 and MoO2F2, have been prepared by the action of anhydrous hydrogen fluoride upon the corresponding oxychlorides in a platinum vessel surrounded by a freezing mixture. The former compound, MoOF4, which distils at 230° C., is a white hygroscopic solid, of melting-point 97° C. and boiling-point 180° C.; in air it decomposes, simultaneously becoming blue in colour. The latter compound, MoO2F2, which sublimes at 265° to 270° C., forms white hygroscopic crystals of density 3.494; with a little water it turns blue in colour, but with much water the mixture is colourless. Heated in air, it decomposes, evolving hydrogen fluoride and leaving a residue of molybdic anhydride. An alternative method of preparation of the oxyfluoride MoO2F2 consists in heating together molybdic anhydride and lead fluoride, cryolite, or other metallic fluoride in a stream of carbon dioxide or oxygen. Compounds of this oxyfluoride with metallic fluorides ("fluoroxymolybdates") are known.

With sodium, the compound MoO2F2.2NaFH2O is formed as a crystalline salt by treating the normal molybdate with a slight excess of hydrofluoric acid. The potassium salts which have been prepared are MoO2F2.2KF.H2O and MoO2F2.KF.H2O, while to other compounds the following formulae have been assigned: MoOF3.2KF.H2O and 3MoOF3.5KF.H2O. With rubidium, the compound MoO2F2.RbF.2H2O has been described, as also have the following compounds of ammonium: MoO2F2.2NH4F; MoO2F2.NH4F; MoO2F2.NH4F.H2O; 3MoO2F2.5NH4F.H2O; MoO2F2.3NH4F; MoO2F2.4NH4F.(NH4)2MoO4; MoO3.2NH4F; MoOF3.2NH4F; 3MoOF3.5NH4F.H2O.

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