Chemical elements
  Tin
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Tetramethyl Stannane
      Methyl stannic chloride
      Tin Tetra-ethyl
      Tin Tri-ethyl
      Stannous Fluoride
      Stannic Fluoride
      Sodium Stannifluoride
      Potassium Stannifluoride
      Ammonium Stannifluoride
      Stannous Chloride
      Stannic Chloride
      Chlorostannates
      Stannous Bromide
      Stannic Bromide
      Stannous Iodide
      Stannic Iodide
      Mixed Stannic Halides
      Stannous Oxide
      Stannous Hydroxide
      Stannic Oxide
      Potassium Stannate
      Stannic Acid and its Derivatives
      Parastannic Acid
      Stannyl Chloride
      Parastannyl Chloride
      Stannous Sulphide
      Stannic Sulphide
      Stannic Oxysulphide
      Stannic Iodosulphide
      Stannous Sulphate
      Stannic Sulphate
      Stannic Nitrate
      Stannous Nitrate
      Phosphor-tin
      Stannioxalic Acid
      Stannous Tartrate
      Tin and Silicon
      Stannous Tungstate
    PDB 3e94-3kwy

Stannic Fluoride, SnF4






Stannic Fluoride, SnF4, has been prepared by the interaction of stannic chloride and anhydrous hydrogen fluoride at high temperature. It is a snow-white, crystalline, hygroscopic substance, which has a density of 4.78 at 19° C., and boils at 705° C., but sublimes below this temperature. It dissolves in water with evolution of heat, forming a solution from which hydrated stannic oxide separates on heating or allowing to stand. A solution, which decomposes similarly, is obtained by dissolving the hydrated oxide in hydrofluoric acid. Stannic fluoride combines with ammonia and other bases, and also with alkali and other fluorides to form stannifluorides of the type M'2SnF6.

Stannic fluoride forms with ammonia at 43° C. the white solid SnF4.NH3, which can be heated to 400° C. with loss of very little ammonia; the compound SnF4.2NH3 is formed when stannic fluoride and ammonia are heated in a sealed tube at 120°-130° C. Both compounds dissolve in water, but their solutions gradually decompose. Aniline, pyridine, and quinoline also form additive compounds with stannic fluoride.

The stannifluorides were first investigated by Marignac. They are isomorphous with the corresponding complex fluorides of silicon, titanium, germanium, and zirconium.


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